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2005
Organo-phosphorus compounds
S 0080
Magnesium Triflate [Mg(OTf)2] a Highly Stable, Non-Hygroscopic and a RecyclaCatalyst for the High Yielding Preparation of Diethyl α-Trimethylsilyloxy05- 160 ble
phosphonates from Diethyl α-Hydroxyphosphonates by HMDS under Solventless
Conditions. — Various α-hydroxyphosphonates are converted into α-trimethylsilyloxyphosphonates with HMDS in the presence of a catalytic amount of magnesium triflate under neat conditions. The present new method can also be applied to the efficient
silylation of ordinary alcohols and phenols. No conversion is observed for phenols substituted at the para position with nitro and acetyl groups neither under neat conditions
nor in the presence of a solvent. Silylation of cholesterol is achieved using CH2Cl2 as
solvent. — (FIROUZABADI*, H.; IRANPOOR, N.; SOBHANI, S.;
GHASSAMIPOUR, S.; J. Organomet. Chem. 689 (2004) 20, 3197-3202; Dep.
Chem., Coll. Sci., Shiraz Univ., Shiraz 71454, Iran; Eng.) — S. Adam
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