Reaction of 3-methylthio-1-phenyl-5-{[( triphenyl-lambda(5)-phosphanylidene)methane] -amino}-1H-pyrazole-4-carboxylic acid ethyl ester with ROH in the presence of RONa or passium. carbonate affords 6-alkoxyl/aroxyl-3-alkylthio-1,5-diphenyl-1,5-dihydropy...