Orientational Effect of Aryl Groups in Aryl Selenides: How Can <sup>1</sup>H and <sup>13</sup>C NMR Chemical Shifts Clarify the Effect?
作者:Satoko Hayashi、Kentaro Yamane、Waro Nakanishi
DOI:10.1021/jo070988g
日期:2007.9.1
(B: pd) and (A: pl) are predominant for Y = NMe2 and NO2, respectively, the equilibrium constants change from Y to Y in the solutions. The results are supported by the quantum chemical calculations, containing the solvent effect of chloroform. These results demonstrate that δ(H, C: 1) and δ(H, C: 2), as well as δ(Se), serve as the practical standards for pl and pd, respectively, to analyze the structures
通过使用9-(芳基硒基)蒽[9-(p -YC 6 H 4 Se)Atc:1 ]和1-(芳基硒基)蒽醌[1-(p -YC 6 H 4 Se)Atq:2 ],具有各种Y。对于在氯仿-d中检测到的所有Y ,1和2的结构分别为(A:pl)和(B:pd)。在阐明了δ(H,C:1)和δ(H,C:2)的行为后,将它们用于确定氯仿的结构。d为1-(arylselanyl)萘(溶液3),1-(arylselanyl)-2-甲基萘(4),和1-(arylselanyl)-8- bromonaphthalenes(5)。尽管对于所有检查的Y,溶液的4中都保留了(A:pl),但5中的结构是(B:pd),但Y = CN和NO 2除外。另一方面,示出3在(A:pl)和(B:pd)之间达到平衡。尽管(B:pd)和(对于Y = NMe 2和NO 2,A:pl)分别占主导地位,溶液中的平衡常数从Y变为Y。结果得到了包含氯仿