B. Borup et al., A HETEROMETALLIC ALKOXIDE COMBINING HARD AND SOFT LEWIS-ACIDS (ET3PO)(2)BA2CU4(O(T)BU)(8), Journal of organometallic chemistry, 536(1-2), 1997, pp. 109-113
Reaction of copper(I) mesityl with [Ba((OBu)-Bu-t)(2)((BuOH)-Bu-t)(2)]
(4) occurs with 'replacement' of all protons by copper to give an inso
luble solid of empirical formula BaCu2(OtBu)(4). This reacts with Et3P
O to give a soluble product characterized by spectroscopic, combustion
analytical, and X-ray diffraction as (Et3PO)(2)Ba2Cu4((OBu)-Bu-t)(8),
an elongated octahedron (trans Ba-2) with (OBu)-Bu-t groups doubly br
idging eight edges. The phosphine oxide has broken up an apparent poly
mer by coordination of one Et3PO to each barium. (C) 1997 Elsevier Sci
ence S.A.