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On the reactions of molybdenum and tungsten carbonyls with trimethyl‐ and triethyl‐aluminium
Author(s) -
Pasynkiewicz S.,
Jankowski J.
Publication year - 1995
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590090407
Subject(s) - mesitylene , chemistry , molybdenum , toluene , benzene , tungsten , decalin , catalysis , alkylation , nmr spectra database , inorganic chemistry , polymer chemistry , medicinal chemistry , organic chemistry , spectral line , physics , astronomy
Reactions of hexacarbonylmolybdenum, hexacarbonyltungsten and arene complexes of tricarbonylmolybdenum and tricarbonyltungsten with trimethyl‐ and triethyl‐aluminium have been studied. It has been found, based on IR and NMR spectra, that trialkylaluminium does not form complexes with hexacarbonyls of molybdenum and tungsten. Arene (mesitylene, toluene and benzene) complexes of tricarbonylmolybdenum form 1 : 1 complexes with triethylaluminium, and arene complexes of tricarbonyltungsten form complexes with trimethyl‐ and triethyl‐aluminium. Regardless of the molar ratios of reactants (arene)M(CO) 3 /AlEt 3 , only one of the three CO groups bonded to molybdenum or tungsten forms a complex with AlEt 3 . Fast exchange between free and complexed trialkylaluminium and an exchange of trialkylaluminium between all three carbonyl groups have been observed in benzene, toluene and decalin solutions. In the 1 H NMR spectra of the products of the reactions of (mesitylene)Mo(CO) 3 with AIEt 3 and AIMe 3 , signals at –9 to –14ppm (characteristic for molybdenum hydrides) were present. It confirmed an alkylation of molybdenum followed by β‐ or α‐hydrogen elimination with the formation of the corresponding molybdenum hydrides, the actual catalyst of aromatic hydrocarbon hydrogenation.