A novel method for the synthesis of unsymmetrical ketones via the free radical carbonylation of alkyl halides is described. The mechanism of the reaction involves the trapping of an alkyl free radical by CO, the addition of the acyl free radical so formed to an alkene, and termination of the reaction by the abstraction of a hydrogen atom from tributyltin hydride by the product acyl-substituted free radical.
Chemistry of organosilicon compounds. 148. 3-Chloro-2-(trimethylsiloxy)-1-propene as an electrophilic acetonyl equivalent. Novel regioselective synthesis of 1,4-dicarbonyl compounds
A simple method is proposed for the alkylation of cyclododecanone by propargyl halides under phase transfer catalysis conditions with the formation of 2-propargylcyclododecanone. The hydration of 2-propargylcyclododecanone upon catalysis by mercury compounds leads to either 14-methyl-13-oxabicyclo[10.3.0]-pentadeca-1(12),14-diene or 2-acetonylcyclododecanone depending on the reaction conditions. Both these compounds are also readily obtained from 2-(2-chloropropen-2-yl)cyclododecanone which readily forms upon the alkylation of cyclododecanone by 1,2-dichloropropene under phase transfer catalysis conditions.
GU, XUE-PING;KIRITO, YOICHI;IKEDA, ISAO;OKAHARA, MITSUO, J. ORG. CHEM., 55,(1990) N0, C. 3390-3393