Symmetric and Non-Symmetric Dinuclear Alkenyl-Bridged Carbene Complexes of Chromium and Tungsten
作者:Karine Ulrich、Véronique Guerchais、Karl-Heinz Dötz、Loic Toupet、Hubert Le Bozec
DOI:10.1002/1099-0682(200103)2001:3<725::aid-ejic725>3.0.co;2-z
日期:2001.3
piperazine and ethylenediamine to produce the corresponding bis[alkenyl(amino)carbene]ditungsten complexes 5a−b and 6a−b. The reaction of 1a with Cr(CO)5(THF) affords the heterobimetallic (W−Cr) bis(carbene) complex (CO)5W=C(NMe2)CH=CH−Ar−CH=CH(OMe)C=Cr(CO)5 (3′a). This complex, as well as the bis(methoxycarbene) derivative 4′a, can also be obtained by treatment of (CO)5W=C(XR)CH=CH−C6H4−CHO [1c: XR = NMe2;
(CO)5W=C(NMe2)CH=CH-Ar-(OH)(H)C≡CH(1a-b)[a:-Ar-=1,4-C6H4-;b: -Ar- = 2,5-C4H2S-] 与 W(CO)5(THF) 在甲醇中产生非对称的双(烯基卡宾)桥接二钨配合物 (CO)5W=C(NMe2)CH=CH-Ar- CH=CH(OMe)C=W(CO)5 (3a-b)。类似地,对称的双(甲氧基卡宾)二钨衍生物 [(CO)5W=C(OMe)CH=CH-]2(1,4-C6H4-) (4a) 从前体 (CO)5W 中以低收率获得=C(OMe)CH=CH-C6H4-(OH)(H)C≡CH (2a)。配合物 3a 和 3b 与二胺(如哌嗪和乙二胺)发生氨解反应,生成相应的双[烯基(氨基)卡宾]二钨配合物 5a-b 和 6a-b。1a 与 Cr(CO)5(THF) 反应得到异双金属 (W−Cr) 双(卡宾)配合物 (CO)5W=C(N