A disiloxane equilibration approach to the preparation and characterization of 5,5'-(1,1,3,3-tetramethyldisiloxane-1,3-diyl)bisbicycloheptane-2,3-dicarboxylic anhydride

Article abstract of DOI:10.1016/0022-328X(91)83058-C

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 product was confirmed by a combination of nuclear magnetic resonance spectroscopic and liquid chromatographic studies and correlated to the X-ray structure from the D,L-isomer.The hydrosilation of bicyclo<2.2.1>hept-5-ene-2,3-dicarboxylic anhydride 1 by 1,1,3,3-tetramethyldisiloxane and pentamethyldisiloxane is compared.