of the isolated products (93% recovery) gave CY]^'^ = -10.8' or 64% inversion, suggesting that continued reaction in the presence of methanol caused racemization. Indeed, addition of methanol to (S)-(+)-a-naphthylphenylmethylmethoxysilane in the presence of Rhp(pfb), caused 80% racemization within 20 h a t room temperature.
Registry No.(11) The Diels-Alder reaction of the cis isomer: Verlaak, J. M. J.; Klunder, A. J. H.; Zwannenburg, B.
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