Synthesis and Substituent Interactions of Tricarbonylchromium‐complexed Arylalkynylbenzenes — Novel Organometallic Push‐pull Chromophores
作者:Thomas J. J. Müller、Markus Ansorge、Hans Jörg Lindner
DOI:10.1002/cber.19961291206
日期:1996.12
The tricarbonylchromiumcomplexes chlorobenzene 1 reacts with terminal alkynes 2 through a palladium-copper-catalyzed coupling to give a variety of Cr(CO)3-complexed phenylethynyl arenes, heteroarenes and ferrocene 3 in good to excellent yield. Due to the electron-withdrawing nature of the Cr(CO)3 group these novelcomplexes can be regarded as organometallic push-pull chromophores. Analogously, the
三羰基铬配合物氯苯1通过钯-铜催化的偶联反应与末端炔烃2反应,以良好的收率获得了多种Cr(CO)3络合的苯乙炔基芳烃,杂芳烃和二茂铁3。由于Cr(CO)3基团的吸电子性质,这些新颖的络合物可被视为有机金属推挽生色团。类似地,通过偶联碘代苯和2合成相应的游离配体4(苯乙炔基芳烃,杂芳烃和二茂铁)。单一Cr(CO)3络合戊基3e的晶体结构分析结果表明,这两个苯环的共平面度均偏离50.9(2)°,这可能是由于晶体堆积所致。相关性选择的取代基的参数之间建立(σ P,σ我,σ [R,σ P +和Δ π),在羰基碳共振13 C-NMR谱的复合物3。总体的电子取代基效应通过介观机理和诱导机理传递给羰基。推挽复合物3显示出最长的波长吸收带(MLCT带)相对较小的负溶剂变色性。