Photoinduced Electron Transfer Reactions of 3,3-Dialkylated 4,5-Diphenyl-3H-Pyrazoles: A New Route to the Formation of the Solvent Adducts
作者:Yao-Pin Yen、Tseng-Min Huang、Yu-Ping Tseng、Hsuan-Yu Lin、Ching-Cheng Lai
DOI:10.1002/jccs.200400061
日期:2004.4
3,3-Dialkyl-4,5-diphenyl-3H-pyrazoles undergo readily photoinduced electron transfer (PET) reaction with 2,4,6-triphenylpyrylium tetrafluoroborate (TPP + ) in acetonitrile to produce cyclopropenes and 2H-pyrroles. During prolonged irradiation, the new ring-closure products derived from 2H-pyrroles as the secondary photoproducts are also produced. However, the corresponding ester analog exhibits different
3,3-Dialkyl-4,5-diphenyl-3H-pyrazoles 与 2,4,6-triphenylpyrylium tetrafluoroborate (TPP + ) 在乙腈中很容易发生光诱导电子转移 (PET) 反应,生成环丙烯和 2H-吡咯。在长时间辐照过程中,还产生了以2H-吡咯为次级光产物的新型闭环产物。然而,相应的酯类似物表现出不同的行为以获得作为主要光产物的环丙烯和作为次要光产物的环丙烯的[2+2]二聚体。提供了不同行为的基本原理。