| abstract |
Highly effective nematicides against pine wood nematodes contain chlorinated hydroxystilbene or salts thereof (preferably, novel 3',4'-dichloro-3-hydroxystilbene or 3',5'-dichloro-3-hydroxystilbene) which are prepared by synthesizing chlorinated methoxystilbenes from chlorinated benzyl chloride compounds and methoxybenzaldehydes by the Wittig-Horner reaction, performing demethylation to obtain the chlorinated hydroxystilbenes, and preparing the salts thereof by conventional methods, if necessary. |