Highly Reduced Organometallics. 14. Six- and Seven-Coordinate Organotin Derivatives of the Tetrasodium Tetracarbonylmetalates(4-) of Chromium, Molybdenum, and Tungsten

Jiann T. Lin, Gary P. Hagen, John E Ellis

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Treatment of Na4[M(CO)4 with 2 equiv of Ph3SnCl provides approximately 50% yields of [Et4N]2-[(Ph3Sn)2M(CO)4] for M = Cr and W and very low yields for M = Mo. The reaction of L2M(CO)4) where L2 = norbornadiene, cyclooctadiene, tetramethylethylenediamine, or ethylenediamine (M = Cr, Mo, W), with 2 equiv of Ph3SnLi is a more facile and often higher yield route (60-70% for M = Cr, Mo; 35% for M = W) to the same dianions. These materials react with Ph3SnCl to provide 30-40% yields of [Et4N][(Ph3Sn)3M(CO)4], in which Cr, Mo, and W are seven-coordinate. Reactions of [Et4N]2-[(Ph3Sn)2M(CO)4] (M = Cr, Mo) with acetic acid, [Me2NCCl2]Cl, and methyl iodide in acetonitrile provide 30-40% yields of [Et4N][H(Ph3Sn)2M(CO)4], containing seven-coordinate metals, trans-Ph3Sn(CO)4M蠁 CNMe2, and [Et4N][(Ph3Sn)M(CO)4(CH3CN)], respectively. The coordinated acetonitrile in the latter compounds is slowly displaced by PPh3 in acetonitrile at 25 C to give 35-50% yields of [Et4N]-[Ph3SnM(CO)4(PPh3)]. All of these new materials are characterized by elemental analyses and IR and 1H NMR spectra.

Original languageEnglish (US)
Pages (from-to)1145-1150
Number of pages6
JournalOrganometallics
Volume2
Issue number9
DOIs
StatePublished - Sep 1983

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