Chumachenko,T.K. et al., Journal of general chemistry of the USSR, 1970, vol. 40, # 4, p. 826 - 832
作者:Chumachenko,T.K. et al.
DOI:——
日期:——
IMPROVED HORNER-WADSWORTH-EMMONS PREPARATION OF α-METHYL- OR α-ETHYL-α,β-UNSATURATED ESTERS FROM ALDEHYDES
作者:Richard J. Petroski、David Weisleder
DOI:10.1081/scc-100000184
日期:2001.1
The E-isomer selectivity of the Horner-Wadsworth-Emmons olefination of aldehydes to form alpha -methyl- or alpha -ethyl-alpha,beta -unsaturated esters has been improved by using lithium tert-butoxide as the base, triethyl-2-phosphonopropionate or triethyl-2-phosphonobutyrate as the phosphonate, an aldehyde, and hexane as the reaction solvent. Greater E-isomer selectivity was observed in the formation of alpha -methyl-alpha,beta -unsaturated esters than alpha -ethyl-alpha,beta -unsaturated esters. These compounds are useful intermediates for the synthesis of insect pheromones and natural products.
Manufacture of heptan-3:4-dione and ethyl propyl acrylic acid