ISSN:
0009-2940
Keywords:
Phosphonium ylides, cumulated
;
Ethenone, triphenylphosphoranylidene-
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Cumulated Ylides, 22. - Reactions of (Triphenylphosphoranylidene)ethenone with Halogen Compounds and their Preparative Application(Triphenylphosphoranylidene)ethenone (6) reacts with halogen compounds 7 to yield four-membered ylide phosphonium salts 9. Ring opening of 9 under different conditions gives rise to the formation of bis-ylides 13, ylide salts 14, or bis-phosphonium salts 15. Compounds 13/14 are hydrolysed to mono-ylides 16, and the Wittig reaction with aldehydes yields unsaturated acylphosphoranes 17, which on thermolysis afford enyne carboxylic esters 18. From the bis-salts 15 α-branched divinyl ketones 22 are available by bis-Wittig reaction.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19941270825
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