Evaluating the Effect of Catalyst Nuclearity in Ni-Catalyzed Alkyne Cyclotrimerizations
作者:Sudipta Pal、Christopher Uyeda
DOI:10.1021/jacs.5b04990
日期:2015.7.1
reactions of the dinickel catalyst with hindered silyl acetylenes enable characterization of the alkyne complex and the metallacycle that are implicated as catalytic intermediates. Based on these experiments and supporting DFT calculations, the role of the dinuclear active site in promoting regioselective alkyne coupling is discussed. Together, these results demonstrate the utility of exploring nuclearity
介绍了对 Ni 催化的炔低聚反应中催化剂核效应的评估。一种双核配合物,具有由萘啶二亚胺 (NDI) 配体支持的 Ni-Ni 键,可促进快速和选择性的环三聚反应,形成 1,2,4-取代的芳烃产物。带有相关 N 供体螯合物(2-亚氨基吡啶、2,2'-联吡啶或 1,4,-二氮杂二烯)的单镍同类物活性明显较低,并产生复杂的产物混合物。二镍催化剂与受阻甲硅烷基乙炔的化学计量反应能够表征作为催化中间体的炔络合物和金属环。基于这些实验和支持 DFT 计算,讨论了双核活性位点在促进区域选择性炔烃偶联中的作用。一起,
Iron-catalyzed regioselective cyclotrimerization of alkynes to benzenes
作者:Suhas Shahaji Gawali、Chidambaram Gunanathan
DOI:10.1016/j.jorganchem.2018.12.007
日期:2019.2
catalyzed the regioselective [2+2+2] cyclotrimerization of terminal aryl and alkyl alkynes to provide the 1,2,4-trisubstituted benzene molecules. Interestingly, internal alkynes also exhibited similar cyclization and resulted in hexa-substituted benzene compounds. Increased steric bulk on pincer ligands diminished the selectivity for cycloaddition. Cyclotrimerization reactions proceeded at room temperature
Details of pyridine synthesis by the simultaneous cyclotrimerization reactions of substituted acetylenes and nitriles in the presence of cobaltocene
作者:V. A. Sergeev、V. K. Shitikov、A. S. Kurapov、E. V. Leonova、I. P. Antonova-Antipova、Yu. A. Chernomordik
DOI:10.1007/bf00962759
日期:1988.7
SERGEEV, V. A.;SHITIKOV, V. K.;KURAPOV, A. S.;LEONOVA, E. V.;ANTONOVA-ANT+, IZV. AN CCCP. CEP. XIM.,(1988) N 7, 1629-1632
作者:SERGEEV, V. A.、SHITIKOV, V. K.、KURAPOV, A. S.、LEONOVA, E. V.、ANTONOVA-ANT+
DOI:——
日期:——
ALCOHOL COMPOUND, CHEMICALLY AMPLIFIED NEGATIVE RESIST COMPOSITION AND RESIST PATTERN FORMING PROCESS
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20220197140A1
公开(公告)日:2022-06-23
A chemically amplified negative resist composition comprising an alcohol compound of specific structure as a crosslinker has a high sensitivity and dissolution contrast and forms a pattern of good profile with reduced values of LER and CDU.