benzene derivatives in high yields along with the formation of a copper mirror on the wall of the reaction vessel. Reactions of unsymmetrical zirconacyclopentadienes prepared from two different alkynes with acetylenecarboxylates gave benzene derivativesfrom three different alkynes in high yields with high selectivities. Preparation of unsymmetrical zirconacyclopentadienes and benzene derivatives formation
Catalytic and Stoichiometric Reactions of the Parent Olefin Rhodium(I) Complex with Alkynes
作者:Andrey V. Kolos、Yulia V. Nelyubina、Dmitry S. Perekalin
DOI:10.1021/acs.organomet.2c00456
日期:2022.11.14
The parent ethylene rhodium(I) complex [(C2H4)2RhCl]2 reacts with internal alkynes to give binuclear metallacycles [(C4R4)Rh2Cl2(C2H4)]2 (R = Me, Et, CH2OMe, Ph), which can act as catalytic intermediates in cyclotrimerization reactions. These metallacycles can be converted into catalytically inert metallocenes CpRh(η5-C4R4RhCp) by addition of CpTl. Further reactions of these metallocenes with [CpRhI2]x
母体乙烯铑(I)配合物[(C 2 H 4 ) 2 RhCl] 2与内部炔烃反应生成双核金属环[(C 4 R 4 )Rh 2 Cl 2 (C 2 H 4 )] 2 (R = Me , Et, CH 2 OMe, Ph),可作为环三聚反应的催化中间体。通过添加CpTl,这些金属环可以转化为催化惰性的金属茂CpRh(η 5 -C 4 R 4 RhCp)。这些茂金属与 [CpRhI 2 ] x的进一步反应和AgBF 4导致独特的三层配合物[CpRh(μ-C 4 R 4 RhCp)RhCp](BF 4 ) 2与中心环中的金属原子。所有三种配合物的结构均已通过 X 射线衍射确定。
Bicyclo[2.2.0]hexene: A Multicyclic Mechanophore with Reactivity Diversified by External Forces
作者:Shihao Ding、Wenkai Wang、Anne Germann、Yiting Wei、Tianyi Du、Jan Meisner、Rong Zhu、Yun Liu
DOI:10.1021/jacs.3c13589
日期:2024.3.6
tool in accessing chemical reactivity and reaction pathways that are distinctive from their thermal counterparts. However, eliciting diversified reaction pathways by activating different constituent chemical bonds from the same mechanophore structure remains challenging. Here, we report the design of a bicyclo[2.2.0]hexene (BCH) mechanophore to leverage its structural simplicity and relatively low molecular
Iridium Complex-Catalyzed Highly Selective Cross [2 + 2 + 2] Cycloaddition of Two Different Monoynes: 2:1 Coupling versus 1:2 Coupling
作者:Ryo Takeuchi、Yoshihiko Nakaya
DOI:10.1021/ol035330d
日期:2003.10.1
Highly selective cross [2 + 2 + 2] cycloaddition of two different monoynes is achieved by using a catalytic amount of [Ir(cod)Cl](2) and ligand. The ligand had a considerable effect on the reaction. When 1,2-bis(diphenylphosphino)ethane was used, two molecules of dimethyl acetylenedicarboxylate (DMAD) reacted with one molecule of a monoyne to give the 2:1 coupling product. When 1,2-bis(dipentafluorophenylphosphino)ethane was used instead of dppe, one molecule of DMAD reacted with two molecules of a monoyne to give the 1:2 coupling product.