文摘
An easy and versatile method for the preparation of molecular alkoxysilanols as molecular organosilicates based on acetoxysilylalkoxides (ASA, (RO)(tBuO)nSi(OAc)3−n or (AcO)3−n(tBuO)nSi-O-R-O-Si(OtBu)n(OAc)3−n, R = organic group; n = 0 or 1) is presented. These ASA precursors are prepared from silicon tetraacetate and suitable alcohols and are cleanly hydrolyzed in water to the corresponding alkoxysilanols in the absence of a base or organic solvents. The compounds were characterized by common spectroscopic methods including X-ray structural analysis. Alkoxysilanols were tested in the catalytic conversion of CO2 to styrene carbonate and show quantitative conversion within 15 h at 60 °C and 1 atm of CO2.