Abstract
stereochemical control than the more common trimethylsilyl unit. For example, the condensation of allylic zinc reagents with benzoyl triisopropylsilane produced the a-adduct exclusively. The overall applicability of the process is quite broad.1° Similar results were obtained using a$-unsaturated or aliphatic aldehydes, with organozinc, magnesium, lithium,loaJ1 or potassium reagents. Some of our results are shown in Table 11. Noteworthy is the example that condensation of cis-2pentenyl p o t a s s i ~ m ' ~ J ~ prepared from cis-2-pentene, po-
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