Journal of the Chemical Society, Dalton Transactions p. 655 - 658 (1993)
Update date:2022-08-11
Topics:
Calderazzo, Fausto
Maichle-Moessmer, Caecilie
Pampaloni, Guido
Straehle, Joachim
Halide-exchange reactions of VCl4 or MoCl5 with dry HBr at temperatures between ca. -50 and +20 deg C afforded the corresponding bromides, VBr3 or MoBr4, in good yields, presumably via the formation of unstable higher-valent bromide intermediates which undergo spontaneous loss of bromine.In corresponding reactions with HI the exchange was incomplete and mixed halides were obtained.At room temperature the VCl4-HI system gave VCl3 in an almost quantitative yield.By reaction of MoBr4 with tetrahydrofuran (thf) a = 8.812(2), b = 13.882(5), c = 14.279(3) Angstroem, Z = 4, R = 0.063.The molecule has the usual meridional geometry, typical of other
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