136185-06-3Relevant academic research and scientific papers
Organic Syntheses via Transition Metal Complexes, 55. - 5-Aza-1-metalla-1,3,5-trienes of Chromium and Tungstena and Their Cyclization to 2H-Pyrrole Complexes
Aumann, Rudolf,Heinen, Heinrich,Goddard, Richard,Krueger, Carl
, p. 2587 - 2594 (2007/10/02)
5-Aza-1-metalla-1,3,5-trienes 5 and 6 are obtained in two steps from aminocarbene complexes 1 .The first step involves the condensation of 1 with benzaldehyde (2) in the presence of TiCl4/Et3N to give 3-aza-1-metalla-1,3-dienes 3 (LnM=C-N=C). 3 adds to the 1-aminoalkyne 4 to give 5 and 6 by a chain extension of two carbon atoms.The trans isomers 5 are formed as the major products and are stable both in the solid state and in solution.The cis isomers 6 undergo a novel-type cyclization to give 2H-pyrrole complexes 8.Triene 5b was characterized by an X-ray analysis. Key Words: Aminocarbene complexes, of chromium and tungsten / 3-Aza-1-metalla-1,3-dienes, of chromium and tungsten / 5-Aza-1-metalla-1,3,5-trienes, cyclization to 2H-pyrroles / 2H-Pyrrole complexes, of chromium and tungsten / Pyrroles, syntheses by metal-induced cycloaddition reactions
