Efficient formation of H-addition radical and secondary alkyl radical in pentylthymines γ-irradiated at 77 K
作者:Nobuaki Ohta、Noriyuki Tanaka、Sotaro Ito
DOI:10.1039/a903253c
日期:——
EPR detection of three pentylthymines γ-irradiated at 77 K showed the production of a 5,6-dihydro-5-thymyl radical (5-thymyl radical) as an H-addition radical and a secondary alkyl radical formed by CâH bond fission at the second carbon from the end of the pentyl group. The introduction of the pentyl group into thymine increased total radical yields at 77 K up to about twice that of thymine and considerably enhanced 5-thymyl radical yields. Several discussions on the radical formation suggest that the efficient production of 5-thymyl radical is related to the concomitant formation of the secondary radical.
在77 K下对三个戊硫代胸苷进行γ辐照的EPR检测显示,产生了5,6-二氢-5-硫代胸苷自由基(5-硫代胸苷自由基)作为H加成自由基,以及在戊基末端第二碳位上C–H键断裂形成的次级烷基自由基。将戊基引入胸苷中,使得77 K下的总自由基产额增加到胸苷的两倍左右,并且显著提高了5-硫代胸苷自由基的产额。关于自由基形成的几个讨论表明,高效产生5-硫代胸苷自由基与伴随形成次级自由基有关。