Oohashi K, Morikawa N
Radioisotopes. 1984 Jul;33(7):444-8. doi: 10.3769/radioisotopes.33.7_444.
The recoil tritium reactions were studied with lithium beta-phenylpropionate having both the aromatic and aliphatic C-H bonds in the molecule, mainly in terms of the moderator effect on the intramolecular tritium distribution. Recoil tritium atoms were produced by the 6Li(n,alpha)3H reaction. Water molecules were used as the moderator. The tritium activity of the ethylene group represented relative to that of the corresponding ring assumed as a standard (= 100) is 30 in the moderator-free system and is reduced to 13 in the moderated system in which the H2O/beta-PhC2H4CO2Li mole ratio is 328. In the ring, the tritium distribution shows a slight ortho- and para-orientation in the moderator-free system and the selectivity is pronounced when the H2O/beta-PhC2H4CO2Li mole ratio is large. The data show that the aromatic ring tritiation in the moderated system is given by increasing contribution of the reactions of tritium atoms having lower energy than the threshold energy of the ethylene group tritiation.
利用分子中同时含有芳香族和脂肪族C-H键的β-苯基丙酸锂研究了反冲氚反应，主要是从慢化剂对分子内氚分布的影响方面进行研究。反冲氚原子通过6Li(n,α)3H反应产生。使用水分子作为慢化剂。在无慢化剂体系中，相对于假定为标准值（=100）的相应环的氚活度，乙烯基团的氚活度为30；在H2O/β-PhC2H4CO2Li摩尔比为328的慢化体系中，该值降至13。在环中，氚分布在无慢化剂体系中显示出轻微的邻位和对位取向，当H2O/β-PhC2H4CO2Li摩尔比很大时，这种选择性很明显。数据表明，在慢化体系中芳香环的氚化是由能量低于乙烯基团氚化阈值能量的氚原子反应的贡献增加所致。
