Stereo-and regio-selectivity in the photosensitized dimerization of 1,3-dimethylthymine in solution  

作　　者：HEIXiaoming SONGQinhua TANGWenjian WANGHongbo GUOQingxiang YUShuqin 

机构地区：[1]DepartmentofChemistry [2]DepartmentofChemicalPhysics,UniversityofScienceandTechnologyofChina,Hefei230026,China

出　　处：《Progress in Natural Science:Materials International》2005年第4期375-379,共5页自然科学进展·国际材料（英文版）

基　　金：SupportedbyNationalNaturalScienceFoundationofChina (GrantNos.3 0 0 0 0 0 3 6;2 0 2 73 0 66)andSpecialFundforDoctoralProgrammefromtheStateEducationCommissionofChina (2 0 0 0 0 3 5 82 1)

摘　　要：The effects of reaction pathway and temperature on stereo and regio selectivity of photocycloaddition of 1, 3 dimethylthymine (DMT) which gives four cyclobutane type dimers in solution using acetone as the photosensitizer, are investigated by measuring the product distribution. It is demonstrated that the ground state aggregation between DMT molecules mainly leads to (h t) dimers, and the diffusion controlled triplet dimerization is favorable to the formation of (h h) dimers.The effects of reaction pathway and temperature on stereo- andregio-selectivity of photocycloaddition of 1,3-dimethylthymine (DMT) which gives four cyclobutanetype dimers in solution using acetone as the photosensitizer, are investigated by measuring theproduct distribution. It is demonstrated that the ground-state aggregation between DMT moleculesmainly leads to (h-t) dimers, and the diffusion-controlled triplet dimerization is favorable to theformation of (h-h) dimers.

关 键 词：[2 + 2] photocycloaddition cyclobutane pyrimidine dimer STEREOSELECTIVITY regioselectivity 

分 类 号：Q523[生物学—生物化学]