In order to study the polar substituent effect almost with no steric effect in organophosphoruschemistry,a series of 4-substituted-2,6,7-trioxa-1-phosphabicyclo
The configuration of the hydroxy acid 2, a product from base-catalyzedautoxidation of 3α,5-cyclo-5α-cholestane-6-one,was established on the basis of NMRtechni
Carbonyl bis(4’-benzo-15-erown-5) has been synthesized by heating the mixture of benzo-15-crown-5 and 4’-earboxybenzo-15-crawn-5 in polyphosphoric aeid(PPA),
When the mixture of CpTiCl<sub>3</sub>-KI is used, many acetals and ketals, which are difficuitly deprotected with CpTiCl<sub>3</sub> alone, can be easily conve