Reactivity of a two heteroatom stabilized anionic chromium (0) carbene complex towards a mono- and a disubstituted alkyne: New synthesis of gamma-aminobutenolides and formation of a novel oligomer chromium (0) complex

Abstract

The reaction of the chromium anionic carbene complex 1 towards diphenylacetylene and phenylacetylene is reported. In the former case the synthesis of gamma-functionalized butenolides results after demetallation of the chromium complex 2 and the latter leads to the formation of a novel oligomer chromium complex 5. These complexes were characterized by mass spectrometry, IR and H-1 and C-13 NMR spectroscopies and their structures were confirmed by single-crystal X-ray analysis. (C) 1997 Elsevier Science S.A.