Hypercoordinate, tetraaurated carbon-complexes of the type [H 3 C--C (AuPR 3 ) 4 ] + BF 4 - , R = Ph (1), R = C 6 H 11 (2), (PR 3 ) 2 = 1,2-C 6 H 4 (CH 2 CH 2 PPh 2 ) 2 (3) have been prepared by the reaction of the appropriate (phosphane)gold(I) chlorides with 1,1,1-tris(dimethoxyboryl)ethane H 3 C -C [B(OMe) 2 ] 3 in the presence of CsF. The products have been characterized by standard analytical and spectroscopic methods, including single crystal X-ray analyses of 1 and 2. In each case the pentacoordinated carbon atoms have been located at the centre of a square pyramide built up by a methyl group at the apex and four gold atoms forming the base with short Au ··· Au distances of about 2.85 Å, which strongly contribute to the formation and stability of these species.
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Steigeimann et al. (1993) studied this question.