SIMPLE ALKYNE ADDUCTS OF MOO(S2CNR2)2

It has recently been shown that MoO(S2CNEt2)2 can reversibly bind acetylene in solution whereas no binding between the complex and ethylene was observed.1 Spectroscopic evidence demonstrated that the alkyne is bound cis to the oxo group and is in the plane which is perpendicular to the MoO bond vector. This geometry, which is readily predicted using simple bonding arguments, is identical with those found with the structurally characterized adducts of the activated alkene tetracyanoethylene2 and the activated alkyne ditoluoylacetylene.3 The actual isolation of acetylenic adducts has been accomplished up to this time in only those cases where the alkyne bears strongly activating substituents as in [FORMULA OMMITED] We now wish to report the isolation and characterization of several adducts of MoO(S2CNMe2)2 and MoO-(S2CNEt2)2 with the simpler alkynes acetylene, phenylacetylene, and diphenylacetylene. © 1979, American Chemical Society. All rights reserved.