Verfahren zur Cyclisierung von Acetylenverbindungen zu aromatischen Verbindungen

摘要

Aromatic hydrocarbons are prepared by cyclization in presence of Co(CO)3NO of compounds R-C­C-R1 where R and R1 are each H or a hydrocarbon group. Examples describe the conversion of phenylacetylene to 1,2,4-triphenylbenzene and a pentaner, presumably pentaphenyldihydronaphthalene; and isopropenylacetylene to 1,2,4-tris-(isopropenyl)benzene. Vinylacetylene, propyne and dibutyl-acetylene are also mentioned as suitable starting materials.ALSO:Aromatic compounds are prepared by cyclisation in presence of Co(CO)3NO of compounds R-C­C-R1, where R and R1 are each H, an organic group or a metallo-organic group. Examples describe the conversion of 1-hydroxyisopropylacetylene to 1,2,4-tris(1-hydroxyisopropyl)benzene; butynediol - 1,4 to hexamethylolbenzene; propargyl alcohol to 1,2,4- and 1,3,5-trismethylbenzene and butyre-1-ol-3 to (presumably) tris(1-hydroxyethyl)-benzene. Also mentioned as suitable starting materials are methyl acetylenecarboxylate and acetylenedicarboxylate which would presumably give methyl benzenetricarboxylate and benzenehexacarboxylate respectively.ALSO:Aromatic tris-silicon compounds are obtained by trimerization of the compounds (CH3)3Si-C­CH and (CH3)3Si-C­C-C6H5 in the presence of cobalt nitrosyl carbonyl (C0(CO)3NO).