| | 1 | Author
| Thomas Schmidt, Stephan Neis, Richard Goddard | Requires cookie* | | | Title
| Synthesis, Structure, and Properties of Homoleptic l-Oxa-l,3-diene Molybdenum and Tungsten Complexes  | | | | Abstract
| Homoleptic tris(l-oxa-l,3-diene)m olybdenum and tungsten complexes are formed as yel low, crystalline compounds in 54-80% isolated yield on treatm ent of the corresponding /3-unsubstituted a,/3-unsaturated ketones with W (CO)3(CH 3CH 2CN)3 or (y6-C6H 6)M o(CO)3 in refluxing hexane. Reaction of these oxadienes with (^6-C6H 5CH3)2Mo in tetrahydrofuran or /7-hexane provides a new high yield route to homoleptic molybdenum complexes that are otherwise difficult to prepare. X-ray crystal structure analyses of two air-stable, isomeric tungsten complexes reveal a significant contribution of a cr2,?/2-bonding mode in the coordi nated oxadiene moieties. U nder reaction conditions that allow the platinum catalyzed hydro genation of phenyl substituents in these ligands, the coordinated oxadiene fragments are inert, thus demonstrating an unprecedented chemoselectivity in the hydrogenation of aryl-substituted enones. On the other hand, the complexes are labile enough to catalyze the cyclotrimerization of alkynes such as methyl propiolate. | | | |
Reference
| Z. Naturforsch. 50b, 315—325 (1995); received September 7 1994 | | | |
Published
| 1995 | | | |
Keywords
| Oxadiene Complex, Molybdenum, Tungsten, X-Ray, Selective Hydrogenation | | | |
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| default:Reihe_B/50/ZNB-1995-50b-0315.pdf | | | | Identifier
| ZNB-1995-50b-0315 | | | | Volume
| 50 | |
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