Reactions of α-lithio (aminocarbene)tungsten anions with diiodoalkanes: Synthesis of (μ-bis(aminocarbene))ditungsten complexes

David W. Macomber, Puttannachetty Madhukar

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Treatment of (CO)5W[C(N(CH3)2)CH3] (1) with nBuLi followed by 5-10 equiv. of a diiodoalkane (diiodomethane, 1,2-diiodoethane, 1,3-diiodopropane, 1,4-diiodobutane, or 1,5-diiodopentane) gave the respective (iodoalkylaminocarbene)tungsten complexes (CO)5W[C(N(CH3)2)CH2(CH2)nI] (n=1-5) (2). For the reaction of the α-lithio anion of 1 with diiodomethane, only a 5% yield of the corresponding complex 2a (n = 1) was obtained. Moreover, the reaction of the α-lithio anion of 1 with 1,2-diiodoethane gave no product 2b (n = 2). On the other hand, good to excellent yields (69-93%) of complexes 2c-e (n = 3-5) were obtained using 1,3-diiodopropane, 1,4-diiodobutane, or 1,5-diiodopentane. Complexes 2c-e were further treated with the α-lithio anion of 1 to afford the new (μ-bis(aminocarbene))ditungsten complexes (CO)5W[C(N(CH3) 2)CH2(CH2)nCH2C(N(CH3)2)]W(CO)5 (n=3-5) (3c-e) in yields ranging from 52 to 61%.

Original languageEnglish (US)
Pages (from-to)279-285
Number of pages7
JournalJournal of Organometallic Chemistry
Issue number3
StatePublished - Jul 28 1992

Bibliographical note

Funding Information:
We wish to thank the Bureau of General Research (Kansas State University) for support of this research. High resolution mass spectra were performed by the Midwest Center for Mass Spectroscopy, a National Science Foundation Regional Instrumentation Facility (Grant No. CHE 8211164). We also wish to thank Pressure Chemical Co. for their generous gift of tungsten hexacarbonyl.

Copyright 2014 Elsevier B.V., All rights reserved.

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