130307-90-3Relevant 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
Organische Synthesen mit Uebergangsmetall-Komplexen XLV. 3-Hydroxypyridine, 1H-Pyrrole und 2-Hydroxypyrrol-Derivate aus einem Aminocarben-Chromkomplex und Alkinen
Aumann, Rudolf,Heinen, Heinrich
, p. C1 - C6 (2007/10/02)
Pyrroles VI, 3-hydroxypyridines V and 2-hydroxypyrroles IX have been obtained from (amino,phenylcarbene)pentacarbonyl-chromium (I) by simple two-step procedures.The first step involves the generation of 2-azaallenyl(pentacarbonyl)chromium complexes III, and VIII by condensation of I with an aldehyde II and an acid chloride VII, respectively.Complexes III react with alkynes IVa-i to give pyrroles VI and 3-hydroxypyridines V.VIII adds alkynes IVa,e,g to give 2-hydroxypyrroles IX.
Organische Synthesen mit Uebergangsmetall-Komplexen XLIX. Pyrrole aus einem Aminocarben-Chromkomplex und Alkinen: Synthese eines neuartigen β-Tripyrrans sowie eines cyclischen β-Trispyrrols
Aumann, Rudolf,Heinen, Heinrich
, p. C7 - C11 (2007/10/02)
A β-tripyrane XI and a cyclic β-trispyrrole XII were obtained by means of a novel two-step pyrrole synthesis from pentacarbonyl(1-amino-1-phenylmethylene)chromium IV via an intermediate iminocarbene complex VI.VI adds alkynes VIIa-e to give the 1H-pyrrole
