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ORGANIC CHEMISTRY 1 Prof. Janina E. Kamińska
Łódź University of Technology Faculty of Biotechnology and Food Sciences Institute of General Food Chemistry ul. Stefanowskiego 4/10 Room no 209 (Consultation hours: Wed. 11:15-12:00, Fri. 14:15-15:00) Phone:
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ORGANIC CHEMISTRY 1 sem. II. 2018/19
Lecture 30 h Tutorials 15 h Workload outside classroom 75 h ECTS credits: 4
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Final grade consist of:
13 June 2019: written tutorials test 50% 8 May 2019 and 26 June 2019 average of 2 written lecture tests %
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PERIODIC TABLE OF ELEMENTS
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Structures of some organic compounds
Octane number = 100
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Structures of some organic compounds
Vanilla flower Vanilla pods
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Structures of some organic compounds
Antimalarial activity Cinchona tree
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Structures of some organic compounds
Fragrance component Jasmine flowers
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Structures of some organic compounds
Flavour and cooling effect Mentha species
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Structures of some organic compounds
Sugar beet Sugar cane
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Structures of some organic compounds
Artificial sweetener
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Structures of some organic compounds
Synthetic compound increasing man’s sexual potency
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The main components of organic chemistry as a discipline are these:
1. STRUCTURE DETERMINATION – how to find out the structures of new compounds even if they are available only in invisibly small amounts 2. THEORETICAL ORGANIC CHEMISTRY – how to understand those structures in terms of atoms and the electrons that bind them together 3. REACTIONS MECHANISMS – how to find out how these molecules react with each other and how to predict their reactions 4. SYNTHESIS – how to design new molecules and then make them in the laboratory 5. BIOLOGICAL CHEMISTRY – how to find out what Nature does and how the structures of biologically active molecules are related to what they do
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Lectures Structure and bonding in organic compounds. Covalent and ionic bonds. Hybridization of carbon (sp3, sp2, sp). Basic conceptions and definitions – acidity, basicity, polarity, polarizability, nucleophilicity, electrophilicity. Structure and molecular properties. Isomerism of organic compounds: constitutional and stereoisomerism (cis-trans isomers, chirality of carbon, optical rotation, absolute configuration of chiral carbon, racemate, enantiomers, diastereomers, meso compounds). Writing and naming of stereoisomers. Mechanisms of organic reactions – parameters describing the reaction, energy profiles. General types of organic reactions. Writing balanced reaction equations. Hydrocarbons: alkanes, cycloalkanes (radical halogenation); alkenes, alkynes (electrophilic addition to multiple bonds); arenes (electrophilic aromatic substitution).
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Lectures Methods of isolation and purification of organic compounds (crystallization, distillation, chromatography). Structure determination by spectroscopic methods: general principles of mass spectrometry (MS), infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR), ultraviolet spectroscopy (UV). Alkyl halides – nucleophilic substitution and elimination (SN1, SN2, E1, E2 mechanisms) Alcohols, phenols – preparation and chemical reactivity. Ethers and epoxides - preparation and chemical reactivity. Overview of carbonyl group chemistry Aldehydes and ketones – preparation and chemical reactions: nucleophilic addition to carbonyl group; -substitution reactions, carbonyl condensation reactions (aldol condensation). Carboxylic acids and their derivatives (acyl chlorides, anhydrides, esters, amides, nitriles) – preparation and chemical behaviour (nucleophilic acyl substitution, -substitution reactions).
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Tutorials Different manners of writing and drawing structural formulas of organic molecules. Systematic (IUPAC) and common names of hydrocarbons. Systematic (IUPAC) and common names of compounds with single functional group. Isomerism of organic compounds. a) Constitutional isomerism b) Stereoisomerism. Writing and drawing stereoisomers on the plane. Cis-trans isomers of alkenes and cycloalkanes. Chirality of organic molecules – enantiomers. Absolute and relative configuration of chiral centre. Equation of chemical reaction – its meaning and application. Material balance in chemical equation. Classifying of organic reactions into general categories: addition, elimination, substitution, rearrangement. Chemical reactivity of hydrocarbons: alkanes, alkenes, alkynes, arenes.
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Textbooks In English: John McMurry, “Organic Chemistry”, 8th ed. Brooks/Cole Publishing Co., Pacific Grove, California (or earlier editions) K. P. C. Vollhardt, N. E. Schore, “Organic Chemistry, Structure and Function”, 3rd ed. W. H. Freeman and Co., New York 1999 F. A. Bettelheim, J. March, “General, Organic and Biochemistry”, 5th ed. Harcourt Brace College Publishers 1998 J. Clayden, N. Greeves, S. Warren, P. Wothers, “Organic Chemistry”, Oxford University Press 2000 In Polish: John McMurry, “Chemia organiczna”, t1/2, translation from 4th ed., PWN Warszawa 2000 (or later editions) H. Hart, L. E. Craine, D. J. Hart, “Chemia organiczna. Krótki kurs”, Wyd. I, PZWL Warszawa 1999
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Biological Applications Fundamentals of Organic Chemistry
Textbooks Organic Chemistry with Biological Applications Organic Chemistry Fundamentals of Organic Chemistry
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ORGANIC CHEMISTRY 1 Lecture 1 Different manners of writing and drawing
structural formulas of organic molecules Systematic (IUPAC) and common names of hydrocarbons Systematic (IUPAC) and common names of compounds with single functional group.
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Language of organic chemists
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Types of organic compounds
HYDROCARBON FRAMEWORK HYDROCARBON FRAMEWORK FUNCTIONAL GROUP
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Drawing and naming of organic structures
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Rules for drawing skeletal structures
Carbon atoms are not shown. They assumed to be at each intersection of two lines (bonds) and at the end of each line. Occasionally, a carbon atom might be indicated for emphasis or clarity. Hydrogen atoms bonded to carbon are not shown. Since carbon has always valence of 4, we mentally supply the correct number of hydrogen atoms to fill the valence of each carbon. All atoms other than carbon and hydrogen (heteroatoms) are indicated.
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ALKANES (saturated hydrocarbons, aliphatic hydrocarbons)
Do not contain functional groups
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Functional groups. With carbon-carbon multiple bonds (aromatic ring)
Alkene Alkyne Arene (aromatic ring)
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Types of functional groups.
With carbon singly bonded to an electronegative atom Alkyl halide Alcohol Ether Amine Thiol (thioalcohol) Sulfide (thioether)
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Functional groups. With carbon-oxygen double bond (carbonyl groups)
Aldehyde Ketone Carboxylic acid Ester Amide Acid chloride
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Naming alkanes according to IUPAC rules
Prefix—Parent—Suffix What are substituents? How many carbons? What family?
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Parent names of chain alkanes from C1 to C20
C1 methane C2 ethane C3 propane C4 butane C5 pentane C6 hexane C7 heptane C8 octane C9 nonane C10 decane C11 undecane C12 dodecane C13 tridecane C14 tetradecane C15 pentadecane C16 hexadecane C17 heptadecane C18 octadecane C19 nonadecane C20 eicosane
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Naming alkanes according to IUPAC rules
Step 1. Find the parent hydrocarbon – that means find the longest continuous carbon chain in the molecule: If 2 different chains are equal, choose the one with the larger number of branch points:
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Naming alkanes according to IUPAC rules
Step 2. Number the atoms in the main chain beginning at the end nearer the first branch point: If there is branching an equal distance away from both ends, begin numbering at the end nearer the second branch point:
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Naming alkanes according to IUPAC rules
Step 3. Identify and number the substituents: on C3, CH2CH3 (3-ethyl) on C2, CH (2-methyl) on C4, CH (4-methyl) on C4, CH (4-methyl) on C7, CH (7-methyl) on C4, CH2CH3 (4-ethyl) 3-ethyl-4,7-dimethylnonane ethyl-2,4-dimethylhexane Step 4. Write the name as a single word using hyphen to separate different prefixes, and commas to separate numbers. Prefixes should appear in alphabetical order.
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Naming alkanes according to IUPAC rules
Step 5. When a substituent of the main chain has its own sub-branching. The name of complex substituent is formed applying the steps 1-4 just as if the substituent was a compound itself. Numbering in complex substituent starts always at the point of attachment to the main chain.
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Common names of straight-chain and branched-chain
alkyl substituents derived from C3 – C4 alkanes propane propyl isopropyl 1 March 2018 butane butyl sec-butyl
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Common names of straight-chain and branched-chain
alkyl substituents derived from C4 – C5 alkanes isobutane isobutyl tert-butyl pentane pentyl
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Common names of straight-chain and branched-chain
alkyl substituents derived from C5 alkanes isopentane isopentyl tert-pentyl neopentane neopentyl
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Naming cycloalkanes according to IUPAC rules
Step 1. Use the cycloalkane name as the parent name When alkyl substituent contains more carbons than ring, use alkane as parent name.
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Naming cycloalkanes according to IUPAC rules
Step 2. In substituted cycloalkanes number the atoms in the ring starting at the point of attachment so as to arrive at the lowest sum. When different substituents are present, they are numbered by alphabetical priority. correct wrong
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Nomenclature of alkenes according to IUPAC rules
Alkenes are named according to a series of rules similar to those developed for alkanes, with the suffix –ene used instead of -ane to identify the family. Step 1. Find the parent hydrocarbon – that means find the longest carbon chain containing the double bond: 7 March 2019
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Step 2. Number the atoms in the chain beginning at the end nearer the double
bond. If the double bond is equidistant from the two ends, begin at the end nearer the first branch point. This rule assures that the double bond carbons receive the lowest possible numbers: 2-hexene methyl-3-hexene Step 3. Write the full name numbering the substituents according to their position in the chain and listing them alphabetically. Indicate the position of the double bond by giving the number of the first alkene carbon. If more than one double bond is present indicate the position of each and use the suffixes -diene, -triene, -tetraene, and so on. 2-ethyl-1-pentene methyl-1,3-butadiene
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Common names of unsaturated substituents
accepted by IUPAC methylene ethylidene vinyl allyl ethenyl propenyl
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Common and systematic names of some alkenes
Systematic name Common name Ethene Ethylene Propene Propylene 2-Methylpropene Isobutylene 2-methyl-1,3-butadiene Isoprene
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Naming cycloalkenes according to IUPAC rules
Cycloalkenes are named in a similar way, but because there is no chain end to begin from, we number the cycloalkene so that the double bond is between C1 and C2 and the first substituent has as low number as possible. 1-methylcyclohexene ,4-cyclohexadiene ,5-dimethylcyclopentene
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Nomenclature of alkynes according to IUPAC rules
Alkynes follow the general rules of hydrocarbon nomenclature. The suffix –yne is used to denote an alkyne, and the position of the triple bond is indicated by its number in the chain. Numbering always begins at the chain end nearer the triple bond so that the triple bond receives as low a number as possible. 6-methyl-3-octyne
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4-methyl-7-nonen-1-yne 1-hepten-6-yne
Compounds with more than one triple bond are called diynes, triynes and so forth; compounds containing both double and triple bonds are called enynes (not ynenes). Numbering of an enyne chain always starts from the end nearer the first multiple bond, whether double or triple. When there is a choice in numbering, though, double bonds receive lower numbers than do triple bonds. 4-methyl-7-nonen-1-yne hepten-6-yne 4-methylnon-7-en-1-yne hept-1-en-6-yne Names of alkynyl substituents: ethynyl propynyl butynyl
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Nomenclature of arenes
Benzene Ethylbenzene Bromobenzene Disubstituted benzene derivatives: ortho-dibromobenzene meta-dibromobenzene para-dibromobenzene o-dibromobenzene m-dibromobenzene p-dibromobenzene 1,2-dibromobenzene ,3-dibromobenzene ,4-dibromobenzene
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and substituents are listed alphabetically
In tri- and more substituted benzenes the lowest possible numbers are used, and substituents are listed alphabetically 1,2-dibromo-4-methylbenzene ,3,5-trimethylbenzene ,4-dibromo-2,5-dimethylbenzene
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Aryl substituents Phenyl Benzyl C6H C6H5CH2- Ph PhCH2- Bn
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Common names of some alkylbenzenes
p-Cymene o-Xylene m-Xylene p-Xylene 1-isopropyl-4-methylbenzene ,2-dimethylbenzene ,3-dimethylbenzene ,4-dimethylbenzene Cumene Mesitylene Styrene Isopropylbenzene ,3,5-trimethylbenzene Vinylbenzene Ethenylbenzene
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Some aromatic hydrocarbons found in coal tar
Benzene Toluene ortho-Xylene Indene Naphthalene Biphenyl Anthracene Fluorene Phenanthrene
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Every organic compound consists of hydrocarbon framework
(and some contain also functional group) Type of skeleton and functional group determine both - physical properties and chemical reactivity of compound. 7 March 2018
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Reactivity of functional group essentially the same,
Aliphatic aldehyde Aromatic aldehyde Reactivity of functional group essentially the same, reactivity of hydrocarbon part different
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Reactivity of hydrocarbon part essentially the same,
Aliphatic amine Aliphatic carboxylic acid Reactivity of hydrocarbon part essentially the same, reactivity of functional group totally different
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Overview of functional groups in organic molecules
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Families of organic compounds
Family name Functional group structure Example Name ending -ane pentane Alkane -ene 2-pentene Alkene -yne 1-pentyne Alkyne None benzene Arene
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None 3-chloropentane Halide -ol 2-pentanol Alcohol ether dipentyl ether Ether
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-amine pentylamine Amine -nitrile pentanenitrile Nitrile None 3-nitropentane Nitro
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-thiol 2-pentanthiol Thiol sulfide dipentyl sulfide Sulfide sulfoxide dipentyl sulfoxide Sulfoxide sulfone dipentyl sulfone Sulfone
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-al pentanal Aldehyde -one 2-pentanone Ketone
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-oic acid pentanoic acid Carboxylic acid -oate ethyl pentanoate Ester
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Amide -amide pentanamide -amide N-methylpentanamide -amide N,N-dimethylpentanamide
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-oyl chloride pentanoyl chloride Carboxylic acid chloride Carboxylic acid anhydride -oic anhydride pentanoic anhydride
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Naming of compounds containing single functional group
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carbon atom of functional group
In chain structures with functional group containing carbon, like: nitrile (-CN), aldehyde (-CHO), carboxylic acid (-COOH), ester (-COOR), amide (-CONH2), acid chloride (-COCl) carbon atom of functional group has to be number 1
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When functional group containing carbon, like:
nitrile (-CN), suffix -nitrile aldehyde (-CHO), suffix -al carboxylic (-COOH), suffix -oic acid ester (-COOR), suffix -oate amide (-CONH2), suffix -amide acid chloride (-COCl) suffix -oyl chloride is directly linked to the ring, the suffix in the IUPAC name is changed to: -carbonitrile, -carbaldehyde, -carboxylic acid, -carboxylate, -carbonamide, -carbonyl chloride
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ring carbon bonded to functional group
and ring carbon bonded to functional group is assign as number 1 !!!
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EXAMPLES 1 1 Propanenitrile Cyclopropanecarbonitrile 1 1
Butanal Cyclobutanecarbaldehyde 1 1 Pentanoic acid Cyclopentanecarboxylic acid
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EXAMPLES 1 1 Ethyl hexanoate Ethyl cyclohexanecarboxylate 1 1
Heptanamide Cycloheptanecarbonamide 1 1 Octanoyl chloride Cyclooctanecarbonyl chloride
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EXAMPLES 1,2-Dimethylcyclopropanecarbonitrile
2-Isopropyl-4-nitrocyclobutanecarbaldehyde 2-Methoxy-4-methylcyclooctanecarbonyl chloride
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When the following functional groups:
sulfonic (-SO3H), hydroxyl (-OH), amino (-NH2), carbonyl (CO), are linked to non-terminal carbons The numbering of parent skeleton should be done in such a way as to assure the lowest possible number for the carbon linked to the functional group
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5-Methylheptane-3-sulfonic acid 3-Chloro-4-methylbenzenesulfonic acid
EXAMPLES 5-Methylheptane-3-sulfonic acid 3-Chloro-4-methylbenzenesulfonic acid
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1-Cyclohexylbutan-2-ol 5-Isopropyl-2-methylphenol
EXAMPLES 1-Cyclohexylbutan-2-ol 5-Isopropyl-2-methylphenol
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EXAMPLES 7-Methyloct-7-ene-4-amine 7- Methyl-7-octene-4-amine
4-Ethyl-2-methylcyclohexylamine 4-Ethyl-2-methylcyclohexaneamine
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2,2,5-trimethylcyclohexanone
EXAMPLES Hepta-1,6-dien-3-one 2,2,5-trimethylcyclohexanone
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All principal functional groups
are of higher priority than C=C or C≡C bonds!!!
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SUBORDINATE FUNCTIONAL GROUPS – EXCLUSIVELY AS PREFIXES
-F fluoro- -Cl chloro- -Br bromo- -I iodo- -NO2 nitro- -R alkyl- (methyl-, ethyl-, cyclopentyl-….etc.) -OR alkyloxy- or alkoxy (methoxy-, cyclopentyloxy-…etc.) -Ar aryl- (phenyl-, naphthyl-, anthryl-…etc.) -OAr aryloxy- or aroxy- (phenoxy-, naphthyloxy-…etc.)
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PRIORITY ORDER OF PRINCIPAL FUNCTIONAL GROUPS
(from the highest to the lowest priority) R4N+Cl- quaternary ammonium chloride R-COOH carboxylic acid R-SO3H sulfonic acid
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R-COO- Na+ carboxylate salt
PRIORITY ORDER OF PRINCIPAL FUNCTIONAL GROUPS R-COO- Na+ carboxylate salt R-COOR’ ester R-COCl acid chloride
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PRIORITY ORDER OF PRINCIPAL FUNCTIONAL GROUPS
R-CONH2 amide R-CN nitrile R-CHO aldehyde
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PRIORITY ORDER OF PRINCIPAL FUNCTIONAL GROUPS
R-CO-R’ ketone R-OH alcohol Ar-OH phenol R-NH2 amine
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Common names of some functional
benzene derivatives Phenol Aniline Benzoic acid Benzaldehyde Phenylamine Benzenecarboxylic acid Benzenecarbaldehyde Acetophenone Benzonitrile Salicylic acid Nitrobenzene 1-Phenylethanone Benzenecarbonitrile 2-Hydroxybenzenecarboxylic acid
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