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Improved Protocols for Molybdenum‐ und Tungsten‐Catalyzed Hydrostannations
Author(s) -
Wesquet Alexander O.,
Kazmaier Uli
Publication year - 2009
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200900093
Subject(s) - chemistry , molybdenum , catalysis , tungsten , carbon monoxide , microwave irradiation , medicinal chemistry , photochemistry , organic chemistry
AbstractA series of (isonitrile)tungsten carbonyl complexes of type W(CO) m (CNR) n has been synthesized and evaluated as hydrostannation catalysts. The results are compared with those obtained by the previously reported tri( tert ‐butylisonitrile)molybdenum tricarbonyl catalyst, Mo(CO) 3 (CN‐ t‐ Bu) 3 (=MoBI 3 ). The yields and selectivities strongly depend on the isonitriles used, and with certain substrates better results are obtained compared to the molybdenum catalyst. No side products are observed in hydrostannations under microwave irradiation or when the reactions are carried out under an atmosphere of carbon monoxide. Based on these findings, a mechanistic rational is given, explaining the different pathways responsible for the formation of hydrostannation or distannation products.