Reactions of Acetylenes and Alkenes Induced by Catalysts of Olefin Matathesis. (Reannouncement with New Availability Information).

摘要

Metal-derivatives that polymerize acetylenes are induced by acetylenes to initiate metatheses of olefins. The mechanism suggests, and experiments verify, that molecules in which olefin and acetylene are appropriately united undergo metal-catalyzed molecular rearrangements that can be recognized as acetylene polymerizations cut short by chain-transfer after only a single cycle. The stereochemistry of the rearrangement reveals that of the pericyclic transformation of metallacyclobutenes into metallabutadienes. Labeling experiments confirm that metal-carbenes propagate the rearrangement.