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Methylenetriimidosulfate H2 CS(NtBu)32- -The First Dianionic Sulfur(VI) Ylide
Bernhard Walfort1, Dietmar Stalke1
1Institut für Anorganische Chemie der Universität Würzburg Am Hubland, 97074 Würzburg (Germany) Fax: (+49) 931-888-4619.
Abstract:
Through isoelectronic replacement of the oxygen atoms in SO42- ions by one CH2 and three NtBu groups one arrives formally at the dianion H2 CS(NtBu)32- , which has been isolated for the first time in the form of the sulfur(VI) ylide complex [(tmeda)2 Li2 {CH2 S(NtBu)3 }]. Deprotonation of the S-bonded methyl group in the triimidosulfonate MeS(NtBu)3- ion provides facile access in good yields. Hydrolysis favors the formation of the triimidosulfate [{(tmeda)Li2 [OS(NtBu)3 ]}3 ] and methane, and not, as one might expect, diimidomethylenesulfate and the amine. tmeda=Me2 NCH2 CH2 NMe2 .
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