A process for selective production of a threo-epoxy compound of the formula: ##STR1## wherein Ar is a substituted or unsubstituted phenyl group and R.sup.1 and R.sup.2 are each a lower alkyl group, which comprises reacting a ketone compound of the formula: ##STR2## wherein Ar, R.sup.1 and R.sup.2 are each as defined above with a sulfur methylide of the formula: ##STR3## wherein A is a lower alkyl group or a substituted or unsubstituted phenyl group and B is a lower alkyl group, a substituted or unsubstituted phenyl group or a di(lower)-alkylamino group in an aqueous organic solvent.
一种选择性制备式的threo-环氧化合物的方法:其中Ar是取代或未取代的苯基,R.sup.1和R.sup.2分别是较低的烷基基团,包括将式的酮化合物与下式的
硫甲基化合物反应在
水有机溶剂中: