Nucleophilicity of N-Nucleophiles: A Kinetics Study of Carbocation by Laser Flash Photolysis

• Main Authors: Meng-YunTseng, 曾孟雲
• Other Authors: Kuang-Sen Sung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/48949736383896300471

碩士 === 國立成功大學 === 化學系 === 102 === The reactive intermediate carbocations of 4-Chromanol and 1-(2Methoxyphenyl)- ethanol have been determined using laser-flash photolysis techniques. Life-time of carbocations depends on the stability is about 6~8 s. While, carbocation reacts with amine, the nucleophile, by SN1 reaction to generate the products. The second-order rate constants of the reaction of this two carbocations and nuceophiles are determined by studying kinetics of laser-flash photolytically. Because the stabilities of carbocation are different, the reactivities and the selectivities would not be same. Furthermore, using the Bunting’s nucleophilicity parameter to compare with the result also prove the Reactivity Selectivity Principle.