Functionalization of Cp<sub>4</sub>Fe<sub>4</sub>(CO)<sub>4</sub>: Contrasts and Comparisons with Ferrocene
作者:Mark D. Westmeyer、Mark A. Massa、Thomas B. Rauchfuss、Scott R. Wilson
DOI:10.1021/ja972557t
日期:1998.1.1
(C5H4X)Cp3Fe4(CO)4 (X = C(OH)HCH3, CO2H, CHO, SPh, PPh2). An excess of LDA gave increased amounts of the di- and even trifunctionalized derivatives (C5H4X)xCp4-xFe4(CO)4 (x = 2, 3). Treatment of (C5H4CHO)Cp3Fe4(CO)4 with the lithiated cluster gave the double cluster [(C5H4)Cp3Fe4(CO)4]2CHOH. The use of the cluster as a ligand was demonstrated by the synthesis of the adducts (C5H4PPh2MLn)Cp3Fe4(CO)4, where
Cp2Fe2(CO)4 和 PPh3 的二甲苯溶液的热解主要产生 Cp4Fe4(CO)4 (1) 以及少量的 (C5H4Ph)Cp3Fe4(CO)4 和 Cp3Fe3(CO)3(PPh2)。通过使用有机锂试剂可以将簇 1 烷基化和芳基化,得到衍生物 (C5H4R)Cp3Fe4(CO)4。该反应与有机锂试剂对 1 的还原竞争。一种更通用的功能化方法 1 包括用二异丙基氨基锂 (LDA) 去质子化,然后用亲电试剂处理得到 (C5H4X)Cp3Fe4(CO)4(X = C(OH)HCH3、CO2H、CHO、SPh、PPh2)。过量的 LDA 会增加双官能化甚至三官能化衍生物 (C5H4X)xCp4-xFe4(CO)4 (x = 2, 3) 的数量。用锂化簇处理 (C5H4CHO)Cp3Fe4(CO)4 得到双簇 [(C5H4)Cp3Fe4(CO)4]2CHOH。通过合成加合物 (C5H4PPh2MLn)Cp3Fe4(CO)4,其中