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Ketones and Aldehydes Properties Nomenclature Preparation Reactions Synthesis
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Carbonyl Functional Groups
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Large Dipole Controls Properties and Reactivity
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Boiling Points Dipole-Dipole Interactions
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Adrogenic/Anabolic Steroids
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Anabolic Steroids
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IUPAC Nomenclature Ketones
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IUPAC Nomenclature Aldehydes
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Classical Aldehyde Nomenclature
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Preparation of Ketones and Aldehydes Friedel-Crafts Acylation (ketones) Gatterman-Koch Formylation (aldehydes) Hydration of Alkynes (ketones with oxymercuration, aldehydes with hydroboration) Ozonolysis of Alkenes (aldehydes and ketones depending on substitution) 1,3-Dithiane alkylations (aldehydes and ketones) Reduction of acids, acid chlorides and nitriles Gilman Reaction (ketones)
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Friedel-Crafts Acylation
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Isoflavones Highly Sought After Natural Products
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Acylation occurs ortho to OH
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Gatterman-Koch Formylation
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Oxymercuration Hydration Markovnikov
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Hydroboration Hydration Anti-Markovnikov
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Ozonolysis Alkene Cleavage
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Gilman Reagent with Acid Chlorides
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DIBAH Diisobutyl Aluminum Hydride
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Nucleophilic Addition Reactions: Strong Nucleophiles
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Carbonyl Reactivity
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Cyanohydrin Formation
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Nucleophilic Addition Reactions: Weak Nucleophiles
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Acetal Formation
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Acetal Mechanism
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Propose a Mechanism
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Use of Ethylene Glycol to Protect Ketones and Aldehydes
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Synthesis
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Aldehydes React Preferentially
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Imine Formation
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Imines and Enamines
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Imine Derivatives
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Wolff-Kishner Reduction
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Mechanism from Hydrazone
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Deoxygenation
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Enamine Mechanism (same as imine mech. until last step)
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Wittig Reaction: C=O into C=C
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Ylide Synthesis
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Mechanism
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Pure Alkene is Formed in Wittig Rxn
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(Methoxymethylene)-triphenylphosphorane an Aldehyde Prep
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Propose a Sequence of Steps…
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Provide a Mechanism
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Conjugate Addition to , -Unsaturated C=O groups
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1,2- vs. 1,4-Addition
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Gilman Reagents add 1,4
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Synthesis
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Carry Out Conjugate Addition 1st
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MCAD Deficiency, a Genetic Disease Children with any of these enzyme deficiencies have a significant risk (20%) of death during the first, clinical episode of hypoglycemia (low blood glucose). Those patients affected show episodes of acute, life-threatening attacks that are symptomatically consistent with Reye’s Syndrome and sometimes misdiagnosed as S.I.D.S. The most common of these in-born errors is MCAD Deficiency. (Medium Chain Acyl-CoA Dehydrogenase) ~1/50 Caucasians carry the gene.
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MCAD Enzyme (MCAD) is one of the enzymes involved in mitochondrial fatty acid -oxidation, which fuels hepatic ketogenesis, a major source of energy once hepatic glycogen stores become depleted during prolonged fasting and periods of higher energy demands. Typically, a previously healthy child with MCAD deficiency presents with hypoketotic hypoglycemia, vomiting, liver dysfunction, skeletal muscle weakness and lethargy triggered by a common illness. On average, this occurs between 3 and 24 months of age.
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Ackee Fruit (Bligia Sapida) from Jamaica Ingestion of the unripe seeds from the fruit of the Jamaican Ackee tree causes a disruption of the dehydrogenase enzymes needed to metabolize fatty acids. This “vomiting sickness” is a result of the enzyme inhibitor Hypoglycin A.
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(R)(-) MCPA is the Toxic Metabolite of Hypoglycin-A
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Wittig Approach to Both Enantiomers
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Wittig Approach to (S)(+)-MCPA Start with (R)(-) Epichlorohydrin S N 2 on 1 o Alkyl Chloride?
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Wittig Sequence Affords (S) (Methylenecyclopropyl)methanol
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Homologation to (S)(-)-MCPA
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Approach to (R)-(+)-MCPA Same Wittig Approach with Ylide Opening the Epoxide First?
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