Structure and Photochemistry of 18-Diazo-1,4,7,10,13,16-hexaoxacyclononadeca-17,19-dione and Its Sodium and Potassium Complexes. Control of the Ground-State Conformation of 2-Diazo-1,3-dicarbonyl Fragment via Host−Guest Complexation
作者:Aneta Bogdanova、Marc W. Perkovic、Vladimir V. Popik
DOI:10.1021/jo051594x
日期:2005.11.1
forms complexes with potassium (2, stability constant in methanol is KK+ = 229 ± 25 M-1) and sodium ions (3, KNa+ = 84.2 ± 7.9 M-1 in methanol). According toB3LYP/6-31G+(d,p) calculations and temperature-dependent 1H NMR spectroscopy, the predominant conformation of 1 has a Z,Z arrangement of the diazo and carbonyl groups. The X-ray crystal structure analysis showed that the potassium complex (2) has
大环18重氮基1,4,7,10,13,16- hexaoxacyclononadeca -17,19-二酮(3重氮基-2,4-二氧代-19-冠-6,1)容易地形成与钾复合物(2,甲醇中的稳定常数为K K+ = 229±25 M - 1)和钠离子( 3, K Na+ = 84.2±7.9 M - 1在甲醇中)。根据B3LYP / 6-31G +(d,p)计算和与温度相关的1 H NMR光谱, 1的主要构型具有重氮基和羰基的Z, Z排列。X射线晶体结构分析表明,钾配合物( 2)具有相同的Z, Z排列,而钠类似物( 2)以重氮二羰基部分的Z, E几何构型存在。重氮化合物的直接254nm的光解1 - 3甲醇中的甲醇导致形成3-甲氧基-2,4-二氧代-19-冠-6(5),这是相应的α,α'-二羰基卡宾插入溶剂的O-H键中的产物。diazomalonates的三重态敏化光解1 - 3产生2,4-二氧代