Azo Compounds. What are azo compounds? Contain the -N=N- group. Where R and R’ are arene groups more stable than alkyl groups. Azo group is stabilised.

Slides:

Advertisements

Similar presentations

CARBOXYLIC ACIDS AND DERIVATIVES

Advertisements

PHENOL Acidity of phenol Reaction with sodium

Nitrogen compounds (Chapter 37).

HSC Chemistry – Acidic Environment R Slider. * The pH of a salt depends upon the relative strength of the ions that make up the salt * Very few salts.

Nitrogen Compounds Ammonia derivatives. Specification from OCR Properties of primary amines Properties of primary amines Amino acids; peptide formation.

A guide for A level students KNOCKHARDY PUBLISHING

ROUTES TO PHENOL A guide for A level students KNOCKHARDY PUBLISHING 2008 SPECIFICATIONS.

Amines, reactions Amines are similar to ammonia in their reactions. Like ammonia, amines are basic. Like ammonia, amines are nucleophilic and react with.

Amines Ammonia derivatives. Specification from OCR o Explain the basicity of amines in terms of proton acceptance by the nitrogen lone pair. o Describe.

23-1 Preparation  We have already covered these methods nucleophilic ring opening of epoxides by ammonia and amines. addition of nitrogen nucleophiles.

Week 6 © Pearson Education Ltd 2009 This document may have been altered from the original Describe the preparation of aliphatic amines by substitution.

Chapter 11: Amines and Related Nitrogen Compounds The painkiller morphine is obtained from opium, the dried sap of unripe seeps of the poppy Papaver somniferum.

Diazonium Salts Diazonium: there are 2 nitrogen atoms joined together in the positive ion. In French, nitrogen is still called by its old name ‘azote’

10-1 Chemistry 2060, Spring 2060, LSU Chapter 10: Amines Sections

Advanced Higher Chemistry Unit 3 Aromatics. Aromatics Aromatics are hydrocarbons containing the benzene ring (C 6 H 6 ). The systematic name for the family.

ORGANIC CHEMISTRY CHM 207 CHAPTER 9: AMINES NOR AKMALAZURA JANI.

1 Diazonium Salts to Functionalize Benzene While we don’t often wish to prepare a nitro compound (unless our goal is to design explosives), the nitro group.

Amines Amines are derivatives of ammonia, NH 3. Amines can be classified as primary, secondary or tertiary. Primary amines have one carbon attached to.

Chemistry. Organic compounds with functional groups containing nitrogen-I Session.

Experiment 23: THEORY OF COLOR IN ORGANIC COMPOUNDS; PREPARATION AND APPLICATION OF ORGANIC DYES.

DYES Dr. Sheppard, CHEM 4201, Fall Dyes in Food  Food Coloring  Natural colors  Synthetic dyes  Why add food coloring ?  Regulation  Structure.

Converting Hydrogen Ion Concentrations to pH Practice Problems.

UNIT 4 A2 ORGANIC CHEMISTRY MECHANISMS AND REAGENTS.

PHENOL CONTENTS Prior knowledge Synthesis from benzene

Nitrite Ion, Nitrous Acid, and Nitrosyl Cation H+ –O NO O NO H H+ O NO HH + + NO + O HH.

Dr. Wolf's CHM 201 & Nitrosation of Alkylamines.

Chapter 24. Amines and Heterocycles Based on McMurry’s Organic Chemistry, 7 th edition.

Week 6 © Pearson Education Ltd 2009 This document may have been altered from the original Describe the preparation of aliphatic amines by substitution.

The nitrogen atom in an ammonia molecule has a lone pair of electrons.

Azo Compounds. What are azo compounds? Contain the -N=N- group. Where R and R’ are arene groups more stable than alkyl groups. Azo group is stabilised.

Learning Objectives 1.Properties of phenols 2.Reaction of phenols.

 Delocalised electrons are what makes benzene so stable and allow it to resist addition reactions.  Electron rich benzene rings are prone to attack.

Experiment 23: THEORY OF COLOR IN ORGANIC COMPOUNDS; PREPARATION AND APPLICATION OF ORGANIC DYES.

AMINES & AMINES SALTS.

AMINES, AMIDES and ANILINE. Amines An amine is a base as well as a nucleophile Some amines are heterocyclic compounds (or heterocycles) Most drugs, vitamins,

24.6 Sources of Phenols Phenol is an important industrial chemical. Major use is in phenolic resins for adhesives and plastics. Annual U.S. production.

AMIDES & IMIDES. 1 ry amide 2 ry amide Aliphatic Aromatic Urea Sulphanilamide Phthalimide Amide Imide.

Arenes: Benzene Arenes are aromatic hydrocarbons containing 1 or more benzene rings. A benzene ring is a ring of 6 carbon atoms, each of which is also.

SALTS When you hear the word salt, what do you think of?

BY HARJEET GUJRAL ASSOCIATE PROFESSOR GOVT. COLLEGE ROPAR

SubstanceReagentObservation Primary alcohol Cr 2 O Secondary alcohol Cr 2 O Tertiary alcohol Cr 2 O KetoneCr 2 O AldehydesCr 2.

PHENOL CONTENTS Prior knowledge Synthesis from benzene

22.16 Nitrosation of Alkylamines. Nitrite Ion, Nitrous Acid, and Nitrosyl Cation H+ –O NO O NO H H+ O NO HH + + NO + O HH.

Chapter 24. Amines Based on McMurry’s Organic Chemistry, 6 th edition.

Physical Properties colourless crystalline solid. soluble in water and is stable in cold but reacts with water when warmed. It decomposes easily in the.

Phenol L.O. To explore the effect of an OH group on the reactivity of the benzene ring. To be able to describe and explain the key reactions of phenol.

Nitrogen Compounds Ammonia derivatives.

ACID-BASE NEUTRALIZATION REACTIONS: A special type of double-replacement reaction. An acid reacts with a base and neutralizes it. The equation will always.

Amines and nitro compounds Vladimíra Kvasnicová. Amines = organic derivatives of ammonia in which one or more of the hydrogen atoms is replaced by an.

PhenolResorcinolCatechol Structures Physical properties: State Color Odor Solid, crystalline. Solid, flaky. Solid, fine powder. White Buff gray Phenolic.

Copyright © 2014 by John Wiley & Sons, Inc. All rights reserved.

Aromatic amines – forming dyes

Amine II. Reactions.

NAMING AMINES These end in –amine. There is, however, rather confusingly two ways of using this suffix. The exam board tend to use the common version where.

Benzene RXNs Reduction RXNs

Chapter 20 Amines.

Amines Plymstock School P.J.McCormack.

Amines are organic derivatives of ammonia, NH3

Describe the reactions of amines with acids to form salts.

Reactions & Mechanisms

Para amino benzoic acid

A guide for A level students KNOCKHARDY PUBLISHING

Diazonium salts synthesis benzenediazonium ion.

Which of the following is NOT a definition of a base?

Presentation transcript:

Azo Compounds

What are azo compounds? Contain the -N=N- group. Where R and R’ are arene groups more stable than alkyl groups. Azo group is stabilised by becoming part of extended delocalised system. Result of a coupling reaction between a diazonium salt and a coupling agent. Azo group

Diazonium salts Only stable salts are aromatic - not particularly stable. Lose -N +  N as N 2(g) Electron rich benzene ring stabilises the -N +  N group but decomposition occurs above about 5 o C. Add cold soln. sodium nitrite (NaNO 2 ) to arylamine soln. In dilute acid below 5 o C. Diazotisation. Prepare fresh and use immediately. N +  N Cl -

How the salt is made. Acid reacts with sodium nitrite to form unstable nitrous acid. NaNO 2 (aq) + HCl (aq)  HNO 2 (aq) + NaCl (aq) Nitrous acid reacts with the arylamine. + HNO 2 + H +  N +  N + 2 H 2 O NH 2 phenylaminebenzenediazonium ion

Diazo coupling reactions A diazonium salt reacts with another compound containing a benzene ring called a coupling agent. Diazonium salt acts as an electrophile - reacts with benzene ring of coupling agent. Coloured precipitate of azo compound immediately forms. Important use as dyes.

Coupling with phenols Benzenediazonium salt and alkaline phenol gives a yellow orange azo compound Benzenediazonium salt and alkaline naphthalen-2-ol gives a red azo compound.

Coupling with amines Diazonium salts couple with arylamines. Benzenediazonium salt and phenylamine gives a yellow azo compound. Use different diazonium salts and coupling agents to make different colours. Azo compounds are stable so dyes do not fade.