Kohn,M., Monatshefte fur Chemie, 1901, vol. 22, p. 48,50
作者:Kohn,M.
DOI:——
日期:——
Cycloadditions. Part III. Steric effects in the addition of 2-diazopropane to conjugated allenic esters and nitriles
作者:S. D. Andrews、A. C. Day、R. N. Inwood
DOI:10.1039/j39690002443
日期:——
Esters of buta-2-,3-dienoic acid and its methyl-substituted analogues react with 2-diazopropane at more electrophilic (αβ) double-bond, but the orientation of addition is dependent on the degree of substitution at the γ-carbon atom. Allenes monosubstituted or unsubstituted at the γ-position give 4-alkylidene-1-pyrazolines (i.e. the electronically preferred adducts). The initial adduct from methyl buta-2