Control of Light-Promoted [2+2] Cycloaddition Reactions by a Remote Ancillary Regulatory Group That Is Covalently Attached to Rhenium Rectangles
作者:Zong-Zhan Lu、Chung-Chou Lee、Murugesan Velayudham、Li-Wei Lee、Jing-Yun Wu、Ting-Shen Kuo、Kuang-Lieh Lu
DOI:10.1002/chem.201202301
日期:2012.12.3
high‐yielding self‐assembly of three neutral rhenium(I) rectangles, [Re2(CO)6(L)(bpe)]2 (1 a, L=2,2′‐biimidazolate (biim); 1 b, L=2,2′‐bisbenzimidazolate (bbim); 1 c, L=2,2′‐bis(4,5‐dimethylimidazolate) (bdmim); bpe=trans‐1,2‐bis(4‐pyridyl)ethylene), under hydrothermal conditions is described. The rectangles were structurally characterized by spectroscopic techniques and further confirmed by single‐crystal X‐ray
三个中性rh(I)矩形[Re 2(CO)6(L)(bpe)] 2(1 a,L = 2,2'-biimidazolate(biim); 1 b, L = 2,2'-双苯并咪唑酸酯(bbim); 1 c,L = 2,2'-双(4,5-二甲基咪唑酸酯)(bdmim); bpe =反式1,2-双(4-吡啶基)乙烯)描述了在水热条件下。矩形通过光谱技术进行了结构表征,并通过单晶X射线衍射进一步证实。在365 nm的Hg灯照射下,矩形1a和1b的bpe配体进行[2 + 2]光环加成反应,生成[(Re(CO)3)2 L} 2(4,4'-tpcb)2 ](2 a,L = biim; 2 b,L = bbim; 4,4'-tpcb = 1,2,3,4-四(4-吡啶基)环丁烷)通过单晶到单晶(SCSC)的转变。但是,矩形1 c,即使在长时间照射后,其在2,2'-联咪唑酸酯配体上含有甲基,也无法进行环加成反应