Process for the preparation of 1,1-dichloromethyl methyl ether and 1,1-dichloromethyl ethyl ether

摘要

Prepn. of 1,1-dichloromethyl methyl oxide or 1,1-dichloromethyl ethyl oxide is characterised in that methyl or ethyl formate is reacted with phosgene, diphosgene, triphosgene and/or oxalyl chloride at 40-100 deg. C in the presence of a catalyst selected from: (a) phosphine oxides or sulphides of formula (I); (b) phosphine dichlorides of formula (II) (R1)(R2)(R3)-P=X; (c) formamides of formula (III) (R1)(R2)(R3)-P(Cl)2; and/or (d) reaction prod. of (III) (R4)(R5)N-CHO and chloriding agents. In the formulae, R1-R3 are (un)substd. aryl; X is O or S; and R4-R5 are 4-10C aliphatic gp. or cyclohexyl.