[EN] METHOD FOR THE SYNTHESIS OF INITIATORS FOR TELECHELIC POLYISOBUTYLENES<br/>[FR] PROCÉDÉ DE SYNTHÈSE D'INITIATEURS POUR POLYISOBUTYLÈNES TÉLÉCHÉLIQUES
申请人:UNIV AKRON
公开号:WO2012094246A1
公开(公告)日:2012-07-12
A new methodology for the synthesis of a novel difunctional- and a known trifunctional initiator, i.e., 1,3-di(2-methoxy-2-propyl)-5-isopropyl benzene and 1,3,5-tri(2-methoxy-2-propyl) benzene, respectively, for the preparation of di- and tri-telechelic polyisobutylenes. The synthesis proceeds in three steps: 1) catalytic peroxidation of 1,3,5-triisopropylbenzene, 2) reduction of the peroxides to the corresponding alcohols, and 3) methylation of the alcohols. By controlling the conversion of the key peroxidation step the relative ratio of di- and tri-fiinctional intermediates can be controlled. By the use of the 1,3-di(2-methoxy-2-propyl)-5-isopropyl-benzene, well-defined di-methoxy telechelic polyisobutylenes can be synthesized. Although the overall combined yield of the two initiators was only 14-20%, because of the low cost of the starting material, reagents used, and simple manipulations these compounds represent the most cost effective initiators to-date for the preparation of telechelic polyisobutylenes.
一种新的合成方法用于合成一种新的二官能和一种已知的三官能引发剂,即1,3-二(2-甲氧基-2-丙基)-5-异丙基苯和1,3,5-三(2-甲氧基-2-丙基)苯,分别用于制备双端和三端聚异丁烯。合成过程分为三个步骤:1) 1,3,5-三异丙基苯的催化过氧化,2) 将过氧化物还原为相应的醇,3) 对醇进行甲基化。通过控制关键过氧化步骤的转化率,可以控制二官能和三官能中间体的相对比例。通过使用1,3-二(2-甲氧基-2-丙基)-5-异丙基苯,可以合成具有良好定义的二甲氧基双端聚异丁烯。尽管两种引发剂的总合成产率仅为14-20%,但由于起始材料的低成本、所使用的试剂和简单的操作,这些化合物代表迄今为止制备双端聚异丁烯最具成本效益的引发剂。