Temperature dependent product distribution in photolysis of o-alkylphenacyl benzoates
作者:Mi Jang、Bum Hee Lim、Hyuk Jun Ryu、Bong Ser Park
DOI:10.1016/j.tetlet.2013.10.109
日期:2013.12
Temperature effect on photochemical reactions of ortho-alkylphenacyl benzoates, one of the recently developed photoremovable protecting groups (PPG), giving indanones (IN) and benzocyclobutenols (CB) was examined. As temperature was lowered, CB was formed preferentially over IN and the amount of IN increased as temperature was elevated. Arrhenius plot of ln(IN/CB) versus 1/T gave a straight line from
研究了温度对邻烷基苯甲酰基苯甲酸酯的光化学反应的影响,邻苯甲酰基苯甲酰苯甲酸酯是最近开发的光可去除保护基团(PPG),它具有茚满酮(IN)和苯并环丁烯醇(CB)。随着温度降低,CB优先于IN形成,并且IN的数量随温度升高而增加。ln(IN / CB)与1 / T的Arrhenius曲线给出了一条直线,从中可以得出Ea IN – Ea CB和A IN / A CB。受位阻最小的2-甲基苯甲酰苯甲酸甲酯(1)给出最高的Ea IN – Ea CB和甲IN /甲CB之间的邻-alkylphenacyl苯甲酸酯在此研究测试包括2,4,6- trimethylphenacyl苯甲酸酯(2)和2,4,6- triisopropylphenacyl苯甲酸甲酯(3)。