Suzuki cross-coupling of hexachlorobenzene promoted by the Buchwald ligands
作者:A. A. Vasil’ev、A. S. Burukin、G. M. Zhdankina、S. G. Zlotin
DOI:10.1007/s11172-022-3392-7
日期:2022.1
The study of cross-coupling between hexachlorobenzene and phenylboronic acid comprised five Buchwald ligands, from which 2-dicyclohexylphosphino-2′-(dimethylamino)biphenyl (DavePHOS) provided the best conversion. When excess of phenylboronic acid was used, a mixture of isomeric tri-, tetra- and pentaphenyl-substituted derivatives in the ∼10:70:20 ratio was obtained, along with minor amounts of hydrodechlorination
Mechanisms of the Thermal Cyclotrimerizations of Fluoro- and Chloroacetylenes: Density Functional Theory Investigation and Intermediate Trapping Experiments
作者:Zhong-Ke Yao、Zhi-Xiang Yu
DOI:10.1021/ja2021476
日期:2011.7.20
substituent effects in the thermal cyclotrimerization of haloacetylenes have been rationalized using frontier molecular orbital theory. The higher reactivity of fluoroacetylenes compared to that of chloroacetylenes is due to the fact that fluoroacetylenes have lower singlet-triplet gaps than chloroacetylenes and more easily undergo dimerization and cyclotrimerization. In this report, additional experiments