Chapter 19: Carbonyls Flashcards
Oxidizing reagents of secondary alcohols

- also turns primary alcohols and aldehydes into carboxylic acids

Oxidizing reagents of primary alcohols


Ozonolysis

- essentially takes every C=C bond in a compund and breaks it apart into two C=O bonds

Reactivity of Carbonyls
- A carbonyl group can be attacked by a nucleophile
- After a carbonyl is attacked, it will try to reform if possible
H-nucleophiles
- source of negatively charged hydrogens (hydride ions)



O-nucleophiles
- turn aldehydes into acetals (ketones to ketals), going through a hemiacetal intermediate





Protecting ketones

-ketones can be protected from reducing agents by turning it into an acetal

Clemmenson Reduction

- useful in acidic conditions

S-nucleophiles

- very similiar to O-nucleophiles, except BF3 used to make carbonyl more electrophilic, forms thioacetals

thioacetals can be reduced


3 types of reduction?
- Clemmenson = acidic conditions
- Raney Ni = nuetral conditions
- Hydrazone = basic conditions
Ketones + Primary amines

makes imines

Ketone + Secondary amine

makes enamines

Alcohols, primary amines, and secondary amines all react with ketones following this mechanism

Oximes


Hydrozones


Reduction of hydrozones


Synthesis of alkanes from ketones
“Wolf-Kirchner Reduction”


Forming grignard reagents
- carbon does not hold - charge very well = very reactive
- can’t perform these reactions in any kind of acid, even water
- or any compound with acidic protons

Carbonyls and grignards


Ylides
- compound with 2 adjacent, oppositely charged atoms
- functions as a carbon nucleophile
Formation of ylides from TPP


Wittig reaction


Sulfur Ylides
- formed the same as phosphorus ylides, but start with DMS
- very different products from Phosphorous ylides though, form epoxides not alkenes



Cyanohydrin Formation


Catalytic Hydrogenation

