Dynamic NMR Study of the Tautomerism of Bicyclic Oxalamidines: Kinetic HH/HD/DD Isotope and Solvent Effects
作者:Gerd Scherer、Hans-Heinrich Limbach
DOI:10.1021/ja00083a009
日期:1994.2
be labeled with 15 N and partly with 2 H. The tautomerism of OA6 was too slow to be detectable by NMR, in contrast to the case of OA7. Rate constants of the tautomerism of OA7 dissolved in methylcycloherane-d 14 (MCY) and in acetonitrile d 3 (AN) could be obtained, including the full kinetic HH/HD/DD isotope effects
已通过动态核磁共振光谱研究了由氮原子之间的分子内简并双质子转移组成的奥拉脒的互变异构现象。对两种双环口服脒进行了实验,即 2,2'-双(3,4,5,6-四氢-1,3-二嗪)(OA6)和 2,2'-双(4,5,6,7-四氢-1,3-二氮杂) (OA7) 溶于有机溶剂。为此,两种化合物都必须用 15 N 和部分用 2 H 标记。与 OA7 的情况相比,OA6 的互变异构太慢而无法通过 NMR 检测到。可以获得溶解在甲基环醚-d 14 (MCY) 和乙腈 d 3 (AN) 中的 OA7 互变异构的速率常数,包括完整的动力学 HH/HD/DD 同位素效应