Norrish type II reactions of acyl azolium salts

Aldol type Condensation Reactions of Acyl Ketene Dithioacetals

Salts and Their Reactions

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Diastereomeric discrimination in the lifetimes of Norrish Type II triplet 1,4-biradicals and stereocontrolled partitioning of their reactivity (Yang cyclization versus Type II fragmentation).

The stereochemistry at C2 and C3 carbons controls the partitioning of triplet 1,4-biradicals of ketones 2 among various pathways. Differences in the major reaction pathways, for example, cyclization (syn) and fragmentation (anti), adopted by the diastereomeric 1,4-radicals of ketones 2 have permitted unprecedented diastereomeric discrimination in their lifetimes to be observed by nanosecond las...

Photochemistry of 2-diphenylmethoxyacetophenone. Direct detection of a long-lived enol from a Norrish Type II photoreaction.

Photolysis of 2-diphenylmethoxyacetophenone (1) in deaerated acetonitrile at room temperature is expected to proceed via Norrish Type II reaction to generate benzophenone (2) and acetophenone (4) as the main isolated photoproducts. Although the acetophenone enol intermediate (3) is generally considered a putative intermediate that is a precursor of acetophenone, there are few reports of the dir...

Imidazole catalysis. II. Acyl transfer and the reactions of acetyl imidazole with water and oxygen anions.

Catalysis of p-nitrophenyl acetate hydrolysis by imidazole and its derivatives has been described in a number of investigations, of which the most extensive are those by Bruice and Schmir and by Bender and Turnquest (2-9). Imidaaole catalysis of the transfer of activated acyl groups from acyl phosphates to a number of acceptor molecules, which is a model for carboxylactivating enzymes and trans...