Cycloadditions of Ruthenium Alkylidyne Complexes with Carbonyl or Thiocarbonyl Compounds

摘要

Whilst the cydoaddition of carbon carbon and rnetul-carbon multiple bonds is central to alkene and alkyne metathesis processes, the addition of heteroallenes and heteroalkenes to alkyiidyne complexes has been less intensely studied despite the added intrigue of multiple bond polarity. Reactions of alkyiidyne complexes of Group 6 metals with carbon disulfide have been discussed recently by Mayr and Lee. and the processes observed typically involve C -C bond formation. We have been previously concernedwith the cycloaddition of SO, and immooxosulfuranes to Group 8 alkyiidyne complexes and have stiggested that the products derive from M - S and C O bond formation (Scheme 11. Herein we report the reactions of a ruthenium benzylidyne complex with CO_2. MeNCS, and CS_2, in which the orientation of addition is opposite to that observed in the analogous reactions with the Group 6 alkyiidyne complexes.