2,6-Di-tert-butyl-4--(diethoxyphosphinoylmethylene)cyclohexa-2,5-dien-1-one
takes up hydrazine to give (3,5-di-tert-butyl-4-hydroxybenzyl)diethoxyphos
phinoylmethylhydrazine 4-[Bis(diethoxyphosphinoyl)methylene]-2,6-di-tert-bu
tylcyclohexa-2,5-dien-1-one undergoes reduction on its reaction with hydraz
ine.