Detail of "2117-50-2"

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Organometallic-substituted allenes - determination of coupling signs and molecular structures of two stannylated allenes

Organometallic-substituted allenes - determination of coupling signs and molecular structures of two stannylated allenes. Wrackmeyer, Bernd; Doerfler, Udo; Kehr, Gerald; Maisel, Heidi E.Several substances are used for example 66088-98-0 and 2117-50-2 which are their cas registry numbers.; Milius, Wolfgang (Laboratorium fuer Anorganische Chemie, Universitaet Bayreuth, Bayreuth D-95440, Germany). Journal of Organometallic Chemistry, 524(1-2), 169-179 (English) 1996 Elsevier. CODEN: JORCAI. ISSN: 0022-328X. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 75 The stannylated allenes (Me3Sn)2C:C:CEtC(SnMe3)2BEt2 (1) and (Me3Sn)2C:C:CMeC(SnMe3)2BMeFc (2, Fc = ferrocenyl) were prepd. by 1,1-organoboration of two equiv. of bis(trimethylstannyl)ethyne (4) with one equiv. of triethylborane or ferrocenyldimethylborane. 4-(9-Borabicyclo[3.3.1]non-9-yl)-1,1,4,4-tetrakis(trimethylstannyl)-1,2-bu tadiene (3) was obtained from the reaction of 4 with dimeric 9-borabicyclo[3.3.1]nonane. The mol. structures of the allenes 1 and 3 were detd. by x-ray anal. In both cases, the structural parameters of the (Me3Sn)2C-BR2 unit indicate Sn-C hyperconjugation, and this model is supported by the small magnitude of the coupling consts. 1J(119Sn, 13C), by the increased 11B nuclear shielding as well as by the unusual changes in the d119Sn values in going from the soln. to the solid state. A fairly complete set of signs of coupling consts. nJ(119Sn, 1H), nJ(119Sn, 13C) and nJ(Sn, Sn) was derived for the allene 3 using 2-dimensional 13C/1H and 119Sn/1H heteronuclear shift correlations. .