New bis[2'-t-butyl-4'-methyl-(d, g) benzo]-2-phenyl-1,3,2-dioxaphospha
cyclo-octadiene (2a) and bis [2'-t-butyl-4'-methyl-(d, g) benzo]-2-hyd
roxy-2-oxy-1,3,2-dioxaphospha cyclooctadiene (2b) were prepared by the
reactions of high hindered 2,2'-diphenol methane (1) with dichlorophe
nylphosphine and phosphorus oxychloride, respectively. Stereochemistry
of 2a and 2b and the reaction of 2a with benzil were studied. All pre
pared compounds have been confirmed by IR, H-1 NMR, P-31 NMR, MS and e
lemental analysis.