Synthesis of Tungsten Oxo Alkylidene Complexes

Synthesis of Tungsten Oxo Alkylidene Complexes
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氧化亚烷基钨配合物的合成

DOI:
10.1021/om3008579
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发表时间:
2012-10-22
期刊:
影响因子:
2.8
通讯作者:
Schrock, Richard R.
Schrock, Richard R.
中科院分区:
化学2区
文献类型:
--
作者:
Peryshkov, Dmitry V.;Schrock, Richard R.

文献摘要

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W(O)(2)(CH 2-t-Bu)(2)(bipy)与ZnCl 2(二氧六环)、PMe 2 Ph和三甲基甲硅烷基氯的混合物在甲苯中于100 ℃反应,以45%的分离产率产生已知的钨氧代亚烷基络合物W(O)(CH-t-Bu)Cl-2(PMe 2 Ph)(2)(1a)。类似地以39%的产率制备新亚苯基类似物W(O)(CHCMe 2 Ph)Cl-2(PMe 2 Ph)(2)。Ia和LiOR(LiOR = LiOHIPT,LiOHMT)在苯中在22 ℃下的反应导致形成灰白色W(O)(CH-t-Bu)Cl(OR)(PMe 2 Ph)络合物4a(OR = OHMT = 2,6-二均三甲苯基苯酚盐)和4 b(OR = OHIPT = 2,6-(2,4,6-三异丙基苯基)(2)苯酚盐)。化合物4a用作合成W(O)(CH-t-Bu)(OHMT)(2,6-二苯基吡咯烷)(6)、W(O)(CH-t-Bu)[N(C6 F5)(2)](OHMT)(PMe 2 Ph)(7)、W(O)(CH-t-Bu)[OSi(t-Bu)(3)](OHMT)(8)和W(O)(CH-t-Bu)(OHMT)(2)(10)的起始材料。发现8与乙烯之间的反应产生四方锥金属环丁烷络合物W(O)(C3 H6)[OSi(t-Bu)(3)](OHMT)(9),而发现10与乙烯之间的反应产生四方锥金属环丁烷络合物W(O)(C3 H6)(OHMT)(2)(11)。化合物11失去乙烯,得到可分离的W(O)(CH 2)(OHMT)(2)(12)。测定了6、7、9和12的X射线结构。
Reaction of W(O)(2)(CH2-t-Bu)(2)(bipy) with a mixture of ZnCl2(dioxane), PMe2Ph, and trimethylsilyl chloride in toluene at 100 degrees C produced the known tungsten oxo alkylidene complex W(O)(CH-t-Bu)Cl-2(PMe2Ph)(2) (1a) in 45% isolated yield. The neophylidene analogue W(O)(CHCMe2Ph)Cl-2(PMe2Ph)(2) was prepared similarly in 39% yield. The reaction between la and LiOR (LiOR = LiOHIPT, LiOHMT) in benzene at 22 degrees C led to formation of the off-white W(O)(CH-t-Bu)Cl(OR)(PMe2Ph) complexes 4a (OR = OHMT = 2,6-dimesitylphenoxide) and 4b (OR = OHIPT = 2,6-(2,4,6-triisopropylphenyl)(2)phenoxide). Compound 4a serves as a starting material for the synthesis of W(O)(CH-t-Bu)(OHMT)(2,6-diphenylpyrrolide) (6), W(O)(CH-t-Bu)[N(C6F5)(2)](OHMT)(PMe2Ph) (7), W(O)(CH-t-Bu) [OSi(t-Bu)(3)] (OHMT) (8), and W(O)(CH-t-Bu)(OHMT)(2) (10). The reaction between 8 and ethylene was found to yield the square-pyramidal metallacyclobutane complex W(O)(C3H6)[OSi(t-Bu)(3)](OHMT) (9), while the reaction between 10 and ethylene was found to yield the square-pyramidal metallacyclobutane complex W(O)(C3H6)(OHMT)(2) (11). Compound 11 loses ethylene to yield isolable W(O)(CH2)(OHMT)(2) (12). X-ray structures were determined for 6, 7, 9, and 12.