Cycloheptatriene and tropylium metal complexes. Part IV. Preparation of 7-exo-substituted tricarbonylcycloheptatrienechromiums
作者:P. L. Pauson、G. H. Smith、J. H. Valentine
DOI:10.1039/j39670001057
日期:——
The 7-exo-configuration is assigned to all substituted tricarbonylcycloheptatrienechromiums previously prepared by the “normal” reaction of tricarbonyltropyliumchromium salts with anions. Several new examples are described, and displacement of methoxide from tricarbonyl-7-exo-methoxycycloheptatrienechromium is shown to be an advantageous alternative route to these products.
C7H8(CO)3MoC(OC2H5)Ar (IX–XIII) formulated as cycloheptatriene(dicarbonyl)[ethoxy(aryl)carbene]-molybdenum and -chromium, and bicycloheptadiene (tricarbonyl)[ethoxy(aryl)carbene]molybdenum complexes, respectively. When C6H5Li or p-, o-CH3C6H4Li was allowed to react with II under the same conditions, deprotonation at the saturated carbon atom of the cycloheptatriene ligand occurred. After treatment with CH3I
环庚三烯(三羰基)钼(I)和-铬(II)与双环庚二烯(四羰基)钼(III)芳基锂ArLi(Ar = C 6 H 5,p-,o-,m -CH 3 C 6 H 4,p -CH 3 OC 6 H 4,p -CF 3 -C 6 H 4),在低温下于乙醚中,随后用Et 3 OBF 4形成的酰基金属化物进行烷基化在0°C的水溶液中,得到10种晶体配合物,组成为C 7 H 8(CO)2 MoC(OC 2 H 5)Ar(IV-VII),C 7 H 8(CO)2 CrC(OC 2 H 5)C 6 H 4 CF 3 - p(VIII)和C 7 H 8(CO)3 MoC(OC 2 H 5)Ar(IX-XIII)分别配制为环庚三烯(二羰基)[乙氧基(芳基)卡宾]-钼和-铬,以及双环庚二烯(三羰基)[乙氧基(芳基)卡宾]钼配合物。当C 6 H 5 Li或对-,o- CH 3 C 6 H 4 Li在相同条件下与II反
Studies on olefin-coordinating transition metal carbene complexes
作者:Jiabi Chen、Bohua Wang
DOI:10.1016/0022-328x(92)83485-z
日期:1992.11
formed with Et3OBF4 in aqueous solution at 0°C gave seven crystalline complexes with the compositions C7H8(CO)3CrC(OC2H5)Ar (4–9) and C7H8(CO)3WC(OC2H5)Ar (10) formulated as norbornadiene(tricarbonyl)[ethoxy(aryl)carbene]-chromium and -tungsten complexes, respectively. Complex 7 has been characterized by X-ray diffraction. Complex 7 is orthorhombic, space group P212121 with a = 10.372(3), b = 12.093(6)
降冰片二烯(四羰基)-铬(1)和-钨(2)与芳基锂试剂ArLi(ArC 6 H 5,o-,m-,p -CH 3 C 6 H 4,p -CH 3 OC)的反应6 H 4,p -CF 3 C 6 H 4),在低温下的乙醚中以及随后用Et 3 OBF 4形成的酰基金属酸酯中间体的烷基化在0°C的水溶液中生成七个结晶配合物,组成为C 7 H 8(CO)3 CrC(OC 2 H 5)Ar(4 – 9)和C 7 H 8(CO)3 WC(OC 2 H 5 Ar(10)分别配制成降冰片二烯(三羰基)[乙氧基(芳基)碳烯]-铬和-钨配合物。配合物7已经通过X射线衍射表征。配合物7是正交的空间群P 2 1 2 1 2 1与一个= 10.372(3),b = 12.093(6),C ^ = 14.154(9)埃,V = 1775.27埃3,与Ž = 4,最终- [R = 0.0529和- [R瓦特= 0.0562为1385米观察到的反射。的1
The synthesis of ring-substituted cycloheptatrienyl complexes [M(CO)3(η7-C7H6R)]+ (M = Cr, Mo or W; R = Me, tBu, C6H4F-p or CCPh)
作者:Andrew Roberts、Mark W. Whiteley
DOI:10.1016/0022-328x(93)80465-n
日期:1993.10
complexes [M(CO)3(η7-C7H6R)]+ [M = Mo; R = Me (7); tBu (8); C6H4-F-p (9); M = Cr, R = CCPh (10)]. Alternatively, substituted cycloheptatrienes C7H7R and cycloheptatrienyl ions C7H6R+ may be coordinated directly to [M(CO)3(NCMe)3]. Reaction of 7-Me-C7H7 with [M(CO)3(NCMe)3] (M = Cr, Mo or W) in THF affords [M(CO)3η6-(7-Me)C7H7}] as a (metal dependent) exo/endo isomeric mixture at C(7). The reaction of the
各种途径对环取代的环庚三烯基复合物的相对优点[M(CO)3(η 7 -C 7 ħ 6 R)] +(M =的Cr,Mo或W)已探索。取代在安排的C的金属7 ħ 7环经由另外,热重排和随后的ħ实现-抽象。因此反应[沫(CO)3(η 7 -C 7 ħ 7)] +用NaOMe给出[沫(CO)3 η 6 - (7-外-OMe)C 7 ħ 7}],这提供取代的环庚三烯配合物[沫(CO)3 η 6 - (7-外-R)C 7 H ^ 7 }] [R =我(1); t Bu(2); C 6 H 4 -F- p(3)]与RMgX反应;直接加入CCPh至[M(CO)3(η 7 -C 7 ħ 7)] +,得到[M(CO)3 η 6 - (7-外-CCPh)C 7 H ^ 7 } ] [M = Cr(4); M = Mo(5)]是通过与炔基铜酸盐试剂反应而产生的。热分解1-4给出了重排的环庚三烯配合物的异构体混合物[M(CO)3