been measured for the α-metallation of some arylmethanes, of 5H-dibenzo[a,d]cycloheptene and its dihydro derivative, free and complexed with tricarbonylchromium, by potassium hydride in tetrahydrofuran in the presence of 18-crown-6 ether. The stable solutions of the complexed anions have been studied by 13C NMR spectroscopy. With the free ligands the kinetic acidity depends upon the structure to a
在18-crown-6存在下,通过氢化钾在四氢呋喃中测量了一些芳基甲烷,5 H-二苯并[ a,d ]环庚烯及其二氢衍生物(与三羰基铬络合)的α-金属化速率常数。醚。通过13 C NMR光谱研究了络合阴离子的稳定溶液。对于游离配体,动力学酸度在很大程度上取决于结构,但是在相应的配合物中,金属化的速率没有明显变化。根据13 C化学位移数据,建议在芳基甲基和二苯并噻吩基阴离子的电子结构之间存在相似性,这将说明它们的金属化速率非常相似。
Cr, Co, and Mn arene π-complexes based on diphenyl- and triphenylmethane
作者:V. S. Kaganovick、M. L. Rybinskaya
DOI:10.1007/bf00697053
日期:1993.10
The interaction of Ph2CH2 and Ph3CH with Cr(CO)6, Co2(CO)8, and Mn(CO)5BF4 leads to mononuclear LCr(CO)3, LCo4(CO)9, and [LMn(CO)3]BF4 π-arene complexes. Similarly, LCr(CO)3Co4(CO)9 and [LCr(CO)3Mn(CO)3]BF4 heteroaromatic derivatives are obtained from LCr(CO)3 complexes, whereas LCo4(CO)9 complexes afford L[Co4(CO)9]2 bicluster derivatives.
Syntheses and X-ray structure determinations of the isomeric pentaphenylethane tricarbonylchromium(0) complexes, 1-tricarbonylchromium(0) phenyl- 1,1,2,2-tetraphenylethane and 2-tricarbonylchromium(0) phenyl-l,1,1,2-tetraphenylethane
作者:Bijaya Misra、H.E. Zieger、Jon Bordner
DOI:10.1016/0022-328x(88)80341-3
日期:1988.6
(CTC) coordinated pentaphenylethanes (PPE) have been synthesized via organometallic coupling reactions. X-Ray structure determinations have shown the ethane carbon-carbon bond distances in C(1) and C(2) CTC complexes of PPE to be 1.615 (±0.007) and 1.620 (±0.005) Å. Deprotonation of pentaphenylethane with the potassium t-butoxide-n-butyllithium complex gives the pentaphenylethyl carbanion at −70°C in