Copper-Catalyzed Electrochemical Selective B–H Oxygenation of <i>o</i>-Carboranes at Room Temperature
作者:Yik Ki Au、Hairong Lyu、Yangjian Quan、Zuowei Xie
DOI:10.1021/jacs.0c02490
日期:2020.4.15
Copper-catalyzed electrochemical selective cage B-H oxygenation of o-carboranes has been achieved for the first time. Under constant electric current (4.0 mA) at room temperature, copper-catalyzed cross-coupling of carboranyl amides with lithium phenolates results in the formation of B(4,5)-diphenolated-o-carboranes via direct B-H activation, whereas the use of lithium tert-butoxide affords B(4)-monooxygenated
作者:Thomas A. Manz、Khamphee Phomphrai、Grigori Medvedev、Balachandra B. Krishnamurthy、Shalini Sharma、Jesmin Haq、Krista A. Novstrup、Kendall T. Thomson、W. Nicholas Delgass、James M. Caruthers、Mahdi M. Abu-Omar
DOI:10.1021/ja0640849
日期:2007.4.1
In this work, we report the synthesis of eighteen titanium cyclopentadienyl aryloxide complexes and their propagation rate constants for 1-hexene polymerization. A correlation between k(p) values and the underlying catalyst structures is developed using DFT-computed ligand cone angles and ion pair separation energies as structural and electronic descriptors. The correlation takes the form of an Arrhenius-like relationship where the pre-exponential factor is correlated to the ligand cone angles and the activation energy term is correlated to the ion pair separation energies. This finding is consistent with the idea that the ability of the monomer to access the metal center is a key factor affecting the reaction rate.
Chhipa, R. C.; Singh, A.; Mehrotra, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1995, vol. 34, # 8, p. 645 - 647
作者:Chhipa, R. C.、Singh, A.、Mehrotra, R. C.
DOI:——
日期:——
Arnett, Edward M.; Moe, Kevin D., Journal of the American Chemical Society, 1991, vol. 113, # 19, p. 7288 - 7293