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REACTIONS OF WITH ARYL HALIDES. A NEW SOURCE OF ARYL RADICALS
Minzoni, Ferruccio,Nardelli, Mario,Pelizzi, Corrado,Predieri, Giovanni
, p. 221 - 224 (2007/10/02)
The complex (dppe = Ph2PCH2CH2PPh2) reacts with aryl halides to give molybdenum chloride complexes and arylation products of the aromatic nucleus, which are typical of homolytic aromatic substitution.The results of experiments carried out directly with MoCl5 and Na(Hg) in the presence of PPh3 or dppe confirm the essential role of the chelating diphosphine in favouring aromatic substitution instead of aryl coupling.The molybdenum complex was also caused to react with heteroaryl halides.In accord with a homolytic mechanism, selectivity towards the o-substituted isomers appears to be a general feature of these reactions.
