Studies of intramolecular hydrogen bonds (IMHB): crystal and molecular structure of 2-(2′-hydroxy-phenyl)imidazoles
作者:Concepción Foces-Foces、Antonio L. Llamas-Saiz、Rosa María Claramunt、Pilar Cabildo、José Elguero
DOI:10.1016/s0022-2860(97)00270-6
日期:1998.1
Abstract The molecular and crystalstructure of 2-(2′-hydroxyphenyl)imidazole (2) and 1-methyl-2-(2′-hydroxyphenyl)imidazole (5) have been determined by X-ray analysis. Compound (2) presents a strong intramolecular hydrogen bond (IMHB) responsible for the planarity of the molecule. In both compounds the molecules form chains through NH…O (compound 2) and OH…N hydrogen bonds (compound 5) but giving
Cooperative bimetallic catalysis is a fundamental approach in modern synthetic chemistry. We report bimetallic cooperative catalysis for the direct decarbonylative heteroarylation of ubiquitous carboxylic acids via acyl C‐O/C‐H coupling. This novel catalytic system exploits the cooperative action of a copper catalyst and a palladium catalyst in decarbonylation, which enables highly chemoselective synthesis
Alkyl carbon-oxygen bonds of alkylarylethers bearing suitable coordination sites were efficiently cleaved by treatment with nickel(II) chloride and zinc in p-xylene under neutral conditions.
在中性条件下,在对二甲苯中用氯化镍 (II) 和锌处理,可以有效地裂解带有合适配位点的烷基芳基醚的烷基碳-氧键。