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Title: An Alkylidene-tethered Tantallanorbornadiene from Reduction of a Tantalum(phenylalkenyl)alkylidene Derived from 3,3-Diphenylcyclopropene Ring Opening by (η-C5Me4R)2Ta2(μ-X)4 (Ta=Ta)
Authors: Huang, Jui-Hsien;Lee, Ting-Yu;Swenson, Dale C.;Messerle, Louis
Contributors: 化學系
Keywords: Organoditantalum;Diphenylcyclopropene ring opening;Tantalum alkenylalkylidene;Tantallanorbornadiene;σ2-Arene complexes
Date: 2003-03
Issue Date: 2012-12-10T01:39:30Z
Publisher: Elsevier
Abstract: The terminal (diphenylalkenyl)alkylidene complexes (C5Me4R)Ta(CHCHCPh2)X2 (R=Me, Et; X=Cl, Br) are formed in moderate yields from the ring-opening reaction of 3,3-diphenylcyclopropene with the organoditantalum(III) halides (η-C5Me4R)2Ta2(μ-X)4. Potassium amalgam reduction of these alkenylalkylidene complexes afforded the alkylidene-tethered tantallanorbornadienes (C5Me4R)Ta[CHCHCPh(σ2-C6H5)], which possess a bent, boat conformation σ2-arene ligand with a fold angle of 19.24(46)° (R=Me) in the solid state. 13C and 1H NMR spectroscopies are consistent with a rapid flip-flop motion that averages the resonances of the σ2-phenyl group to fewer resonances than expected from the solid-state structure.
Relation: Inorg. Chim. Acta., 345: 209-215
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