A compound of the formula: ##STR1## wherein R is an isoproyl group or an n-amyloxycarbonylmethyl group, useful as a herbicide, is effectively produced by reacting a compound of the formula: ##STR2## wherein R is as defined above, with sulfuryl chloride or chlorine in a solvent in the presence of a dehydrohalogenating agent.
A compound of the formula:
wherein R is a lower alkenyl group, a lower alkynyl group or a lower alkoxycarbonylmethyl group, which is useful as an intermediate in the synthesis of herbicides.