Sandra Ann Swint

A disiloxane equilibration approach to the preparation and characterization of 5,5′-(1,1,3,3,-tetramethyldisiloxane-1,3-diyl) bisbicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride

Abstract The preparation of 5,5′-(1,1,3,3-tetramethyldisiloxane-1,3-diyl)bisbicyclo[2.2.1]heptene-2,3-dicarboxylic anhydride, 3 , by a novel synthetic approach was found to be an effective method to isolate this disiloxane which is difficult to purify. The structure of the diastereomerically mixed produced was confirmed by a combination of nuclear resonance spectroscopic and liquid chromatographic studies and correlated to the X-ray structure from the d,l -isomer. The hydrosilation of bicyyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride 1 by 1,1,3,3,-tetramethyldisiloxane and pentamethyldisiloxane is compared.