Abstract
AbstractIntermediates of the cobalt carbonyl-catalysed carbonylation ofortho-substituted benzyl halides were identified by IR, 1 H- and 13 C-NMR spectra. The molecular structures of the acyl-type derivatives 2-MeC 6 H 4 CH 2 C(O)Co(CO) 3 PPh 3 and2-PhC 6 H 4 CH 2 C(O)Co(CO) 3 PPh 3 were determined by X-ray crystallography. Structural features of these complexes arediscussed.© 2003 Elsevier Science B.V. All rights reserved. Keywords: Phase transfer catalysis; Hydroxycarbonylation; Carbonylation; Acylcobalt carbonyls; Alkylcobalt carbonyls; 3 -benzylcobaltcarbonyls 1. IntroductionPhase transfer catalysis (PTC) became a well-estab-lished, environmentally friendly (green) method inpreparative organic chemistry [1]. The combinationof PTC with transition metal molecular catalysts(TM) is one of the most promising potentialities oftransition metal chemistry. TM–PTC is characterisedby dramatic increase in reaction rates, consequentlyenables mild conditions, favourable operational costsand high selectivities [2–8].
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