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Crystal Structure of [(-Cyanoisopropyl-sodium · Tetramethylenediamine)4 : How Coordination Expansion from Li to Na Centers can Increase the Aggregation State of an -Nitrile “Carbanion”

Barker, James and Barnett, N.D.R. and Barr, Donald and CLEGG, W and Mulvey, Robert and O'Neil, P.A. (1993) Crystal Structure of [(-Cyanoisopropyl-sodium · Tetramethylenediamine)4 : How Coordination Expansion from Li to Na Centers can Increase the Aggregation State of an -Nitrile “Carbanion”. Angewandte Chemie International Edition, 32 (9). pp. 1366-1368. ISSN 1433-7851

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Abstract

A tetrameric contact ion pair structure with a distorted cubane (NNa)4 core is revealed for the title complex 1. The structures of such -nitrile “carbanions”–important intermediates in organic chemistry–are dependent on the identity of the metal employed, as a comparison with the related complex 2 with an (NLi)2 ring shows.