Abstract
The title bis-unsaturated compounds undergo bicyclization with (h 2 -propene)Ti(O-i- Pr)2 to give dialkoxytitanacycles, the characteristic reactions of which are highlighted. Substrate- controlled asymmetric cyclizations starting from optically active allenes, enynes having a chiral acetal as a leaving group, and optically active enynoates were found promising to give cyclic compounds with high enantiopurity.
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