The crystal structure of [Mo(NCS)(CO)2(η3-C3H5)(NCMe)2]·MeCN and the reactions of {Mo(CO)2(η3-C3H5)+} containing species with symmetric alkynes
作者:Jonathan W Goodyear、Clive W Hemingway、Ross W Harrington、Matthew R Wiseman、Brian J Brisdon
DOI:10.1016/s0022-328x(02)01981-2
日期:2002.12
In the solid-state [Mo(NCS)(CO)(2)(eta(3) -C3H5)(NCMe)(2)] (.) MeCN (1) contains a pseudo-octahedral arrangement of ligands about molybdenum, with carbonyls and nitriles in the equatorial plane and an N-bonded thiocyanate 3 group trans to the allyl ligand. In refluxing methanol or acetonitrile both 1, and the analogous chloro-complex [MoCl(CO)(2)(eta(3)-C3H5)(NCMe)(2)] (2) catalytically convert PhCdropCPh to a mixture of hexaphenylbenzene and E,E-1,2,3,4-tetraphenylbutadiene. By contrast MeO(2)CCdropCCO(2)Me is not oligomerised. In methanol, complex 2 dimerises 1,4-diphenylbutadiyne to Z,E-1,4,5,8-tetraphenyl-1,7-octa-3,5-diene-1,7-diyne, whereas in the presence of base both the complex and the diyne, react preferentially with the solvent to generate the [Mo-2(CO)(4)(eta(3)- C3H5)(2)(OMe)(3)](-) anion and Z-1,4-diphenyl-3-methoxy-but-3-ene-1-yne, respectively. (C) 2002 Elsevier Science B.V. All rights reserved.