Oxidative addition of water by an iridium PCP pincer complex: Catalytic dehydrogenation of alkanes by IrH(OH){C6H3-2,6-(CH2PBu2t)(2)}

Citation
D. Morales-morales et al., Oxidative addition of water by an iridium PCP pincer complex: Catalytic dehydrogenation of alkanes by IrH(OH){C6H3-2,6-(CH2PBu2t)(2)}, ORGANOMETAL, 20(6), 2001, pp. 1144-1147
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
20
Issue
6
Year of publication
2001
Pages
1144 - 1147
Database
ISI
SICI code
0276-7333(20010319)20:6<1144:OAOWBA>2.0.ZU;2-P
Abstract
The dehydrogenation of IrH2{C6H3-2,6-(CH2PBu2t)(2)} (1) by tert-butylethyle ne followed by reaction with an excess of water leads to the isolation of I rH(OH){C6H3-2,6-(CH2PBu2t)(2)} (2) in nearly quantitative yield. The hydrid e hydroxo complex has been characterized by multinuclear NMR spectroscopy a s well as a single-crystal X-ray structure determination. An isotopic label ing study with D2O indicates that 2 arises from the oxidative addition of w ater to the intermediate 14-electron complex Ir{C6H3-2,6-(CH2PBu2t)(2)}. Th e title complex is an efficient catalyst for the transfer dehydrogenation o f cyclooctane to cyclooctene but shows no catalytic activity for the hydrox ylation of the alkane by water. The conversion of 1 to 2 can be reversed by placing a solution of 2 under 1 atm of H-2 at 25 degreesC.