Substitution of chlorocyclobutanones with xanthate salts. The remarkable effect of added base
摘要:
The substitution reaction of chlorocyclobutanones with dithiocarbonates (xanthates) is greatly accelerated by the addition of a mild base such as DABCO or DBU. (C) 2009 Elsevier Ltd. All rights reserved.
A process for producing cyclobutanones with industrial advantage is provided which comprises contacting an .alpha.-haloacetyl halide with an ethylenic unsaturated compound in the presence of a dehydrohalogenating agent and a Lewis acid.
The preparation of a 2-halocyclobutanone by contacting a 2,2-dihaloalkanoyl halide with an ethylenically unsaturated compound at a temperature of at least 5.degree. C in the presence of dispersed zinc or tin and certain alkanones is conducted by using a molar ratio of zinc (or tin) to 2,2-dihaloalkanoyl halide below 1.00, with the zinc (or tin) in the form of particles having a largest dimension of up to 0.05 mm, and adopting a temperature of up to 55.degree. C.
Certain cyclopropanecarboxylic acid esters also containing a cyano group are prepared by reacting an aldehyde, a salt of hydrocyanic acid and a 2-halocyclobutanone in an aprotic solvent.
某些含有氰基的环丙烷羧酸酯可以通过在无质子溶剂中反应醛、氢氰酸盐和2-卤代环丁酮来制备。
Nakyama Yoshinori, Nagase Masayuki, J. Org. Chem., 60 (1995) N 6, S 1878-1879
作者:Nakyama Yoshinori, Nagase Masayuki
DOI:——
日期:——
BAK D. A.; BRADY W. T., J. ORG. CHEM., 1979, 44, NO 1, 107-110