Two molecularly homogeneous nonionic detergents with specific-14C labeling were prepared. Polyoxyethylene glycols of six and nine ethylene oxide units were coupled to 2,6,8-trimethyl-4-nonanol (TMNOH). The radioactive label was in the first ethylene oxide unit attached to the alkyl moiety, TMNOCH2*CH2(OCH2 CH2)nOH. All react ions employed in this synthesis gave good to excellent results. Two routes were developed for the reduction of an alkoxyacetic acid intermediate to the corresponding alcohol, and both methods gave excellent yields. The overall yields for TMN(OCH2CH2)6OH and TMN(OCH2CH2)9OH were 4Z and 33 per cent, respectively.
制备了两种分子均一的非离子表面活性剂,具有特定的14C标记。六个和九个
乙烯氧化物单元的聚氧
乙烯醇与2,6,8-三甲基-
4-庚醇(TMNOH)连接。放射性标记位于连接到烷基部分的第一个
乙烯氧化物单元,结构为TMNO *
CH2(O )nOH。在此合成中采用的所有反应均获得了良好至优异的结果。为了将一个烷氧
乙酸中间体还原为相应的醇,开发了两条路线,两种方法均给出了优异的产率。TMN(O )6OH和TMN(O )9OH的总体产率分别为42%和33%。