Spectroscopic and Product Studies of the Effect of Para Substituents on the Reactivity of Triplet Bis(2,6-dimethylphenyl)carbenes
作者:Yingmo Hu、Yui Ishikawa、Katsuyuki Hirai、Hideo Tomioka
DOI:10.1246/bcsj.74.2207
日期:2001.11
o-quinodimethanes (6) in solution. The zero-field splitting parameters, D and E, were measured in matrices of different viscosities and are analyzed in terms of a sigma-dot (σ•) scale of spin-delocalization substituent constants. Fairly good correlation with σ• was found for the D values of 32 in its minimum energy geometry. Stabilities of 32 were estimated either by measuring the temperature at which
已经制备了一系列带有八个对称对位二取代基的重氮双 (2,6-二甲基苯基) 甲烷 (1) 并光解生成相应的卡宾 (2)。产品分析研究表明,卡宾 (2) 主要通过二聚作用形成四 (芳基) 乙烯 (3) 或通过攻击邻甲基而通过邻醌二甲烷分解得到 1,2-二氢苯并环丁烯 (4)( 6) 在溶液中。零场分裂参数 D 和 E 在不同粘度的矩阵中测量,并根据自旋离域取代基常数的西格玛点 (σ•) 尺度进行分析。对于 32 的最小能量几何中的 D 值,发现与 σ• 具有相当好的相关性。通过测量解冻基质时三线态卡宾信号消失的温度或通过分析 32 在室温下脱气溶液中的衰变动力学来估计 32 的稳定性。它们根据低温下矩阵中的 D 值和术语进行检查。