Ligand and solvent control of selectivity in the C–H activation of a pyridylimine-substituted 1-naphthalene; a combined synthetic and computational study
作者:Rena Simayi、Simone M. Gillbard、Warren B. Cross、Eric G. Hope、Kuldip Singh、Gregory A. Solan
DOI:10.1039/c8dt02565g
日期:——
in acetic acid to give 2ortho. DFT calculations have been used to investigate the C–H activation steps and it is found that in acetic acid ortho-C–H activation is kinetically and thermodynamically favoured but peri-CH activation is kinetically accessible (ΔΔG‡ = 2.4 kcal mol−1). By contrast in toluene, the reaction appears to be irreversible with the difference in barrier height for ortho- and peri-C–H
吡啶基吡啶取代的1-萘2-(1-C 10 H 7)-6- CR N(2,6-i-Pr 2 C 6 H 3)} C 5 H 3 N(R = Me H L Me(HH L H)与乙酸中的Na 2 [PdCl 4 ]在升高的温度下反应,得到邻位C–H萘基活化的(L Me)PdCl(邻位2)或未活化的加合物(H L H)PdCl 2(1b)。或者,1b及其酮亚胺类似物(H L Me)PdCl 2(1a)可以通过在室温下在氯仿中用H L Me或H L H处理(MeCN)2 PdCl 2来制备。1a在乙酸中的热解也可引发区域选择性邻-C–H活化形成2个邻,而在类似条件下与1b不会发生任何反应。有趣的是,H L Me的C–H活化得到2个邻位被发现是可逆的100%氘围上的Na反应发生-site 2 [的PdCl 4 ]用H大号我在乙酸- d 4。相反,加热1A在甲苯给出了一个55:45混合物2邻位和它的