yl阳离子与Cr(CO)3基团的π络合物大大降低了其对添加甲醇的反应性,并通过三羰基(η-7-外-甲氧基环庚三烯)铬的酸杂解而提高了其形成速率(2); 金属络合的碳正离子1在pH≥7的水溶液中稳定,但在较高的pH值下不可逆地形成中性产物。在MeCN / H 2 O(11 w / w)中2转化为1是一般的酸催化方法。
yl阳离子与Cr(CO)3基团的π络合物大大降低了其对添加甲醇的反应性,并通过三羰基(η-7-外-甲氧基环庚三烯)铬的酸杂解而提高了其形成速率(2); 金属络合的碳正离子1在pH≥7的水溶液中稳定,但在较高的pH值下不可逆地形成中性产物。在MeCN / H 2 O(11 w / w)中2转化为1是一般的酸催化方法。
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.
Cycloheptatriene and tropylium metal complexes. Part V. 7-endo-Substituted tricarbonylcycloheptatrienechromiums
作者:P. L. Pauson、G. H. Smith、J. H. Valentine
DOI:10.1039/j39670001061
日期:——
Reaction of 7-substituted cycloheptatrienes with either hexacarbonylchromium or with tricarbonyltripyridine-chromium leads to the corresponding 7-endo-substituted tricarbonylcycloheptatrienechromiums, either exclusively or, in only two of the cases studied, mixed with the exo-isomer. Some new observations on the ring-contraction of such complexes are reported.
The relative electrophilic reactivities of the tropylium cation and its CR(CO)3, Mo(CO)3, and W(CO)3 complexes
作者:Clifford A Bunton、Kasturi Lal、William E Watts
DOI:10.1016/s0022-328x(00)98842-9
日期:1983.5
The relative rates of transfer of methoxideion from Malachite Green methyl ether in MeNO2/MeCOEt (23 v/v) to tropylium cation (Tr+), [TrCr(CO)3]+, [TrMo(CO)3]+, and [TrW(CO)3]+ are 110/1/10/6, respectively.
MeNO 2 / MeCOEt(23 v / v)中孔雀石绿甲基醚中甲醇离子向对苯二甲酸阳离子(Tr +),[TrCr(CO)3 ] +,[TrMo(CO)3 ] +的相对转移速率,和[TrW(CO)3 ] +分别为110/1/10/6。
The stereochemistry of tricarbonylcycloheptatrienechromium derivatives
作者:P. E. Baikie、O. S. Mills、P. L. Pauson、G. H. Smith、J. Valentine