small initial difference in the angle within bidentate ligands (see scheme) is amplified into an incommensurable difference in the resultant structures (M12L24 or M24L48). This molecular‐level emergent behavior was predicted from the empirical threshold of the ligand bend angle, determined by a ligand mixing experiment, for the critical M12L24/M24L48 switchover.
关键结构转换:双齿配体内角度的微小初始差异(请参阅方案)被放大为最终结构(M 12 L 24或M 24 L 48)中无法估量的差异。根据配体混合实验确定的关键M 12 L 24 / M 24 L 48转换,根据配体弯曲角的经验阈值可以预测这种分子水平的出现行为。
Negishi Cross-Coupling Reaction as a Simple and Efficient Route to Functionalized Amino and Alkoxy Carbene Complexes of Chromium, Molybdenum, and Tungsten
作者:Tomáš Tobrman、Ivana Jurásková、Dalimil Dvořák
DOI:10.1021/om500925m
日期:2014.11.24
phenyl, 2-thienyl, and N-methyl-pyrrol-2-yl Fischercarbenecomplexes of chromium and tungsten was achieved via a Negishi cross-coupling reaction of metalated aminocarbenes in the presence of a palladium catalyst. The reverse approach, i.e., coupling bromocarbenes with organozinc reagents, is also feasible and is particularly useful with alkoxycarbene complexes, metalation of which is not possible. Both
Effect of halogen on the reaction of 1-methylpyrrole with -haloimides.
作者:Michael De Rosa、Gustavo Cabrera Nieto
DOI:10.1016/s0040-4039(00)87893-4
日期:1988.1
In the reaction of -haloimides with 1-methylpyrrole, σ-substitution (addition-elimination) predominates over halogenation, when the halogen is chlorine.
在-卤代酰亚胺与1-甲基吡咯的反应中,当卤素为氯时,σ-取代(加成-消除)占主导地位。
Synthesis of 2- and 3-Substituted N-Methylpyrroles
作者:Elena Dvornikova、Krystyna Kamieńska-Trela
DOI:10.1055/s-2002-32578
日期:——
A reliable method of synthesis of 3-bromo-N-methylpyrrole by the use of N-bromosuccinimide and a catalytic amount of PBr 3 is reported. The method described opens a facile route to a variety of 3-substituted pyrroles, which are otherwise difficult to access. In addition, conditions under which pure 2-bromo-N-methylpyrrole can be obtained have been established.
Ferrocenyl Maleimides – Synthesis, (Spectro‐)Electrochemistry, and Solvatochromism
作者:Alexander Hildebrandt、Steve W. Lehrich、Dieter Schaarschmidt、Romy Jaeschke、Katja Schreiter、Stefan Spange、Heinrich Lang
DOI:10.1002/ejic.201101191
日期:2012.3
Ferrocenylmaleimides have been synthesized from 2,5-dibromo-N-methyl-1H-pyrrole. Bromine shift and oxidation of the pyrrole core with subsequent ferrocenylation using the Negishi C–C cross-coupling protocol led to the formation of 3-ferrocenyl-N-methylmaleimide (3), 3-bromo-4-ferrocenyl-N-methylmaleimide (4), and 3,4-diferrocenyl-N-methylmaleimide (5). The structural properties of 4 and 5 were investigated