A Facile Synthesis of Oxetane Derivatives for Preparing Cross-Linked Polyoxetane Resins Bearing the Bromide at the Spacer End
作者:Masatoshi Motoi、Hiroshi Suda、Katsuhiko Shimamura、Shinsuke Nagahara、Mitsuru Takei、Shigeyoshi Kanoh
DOI:10.1246/bcsj.61.1653
日期:1988.5
3-(6-Bromo-2-oxahexyl and 8-bromo-2-oxaoctyl)-3-methyloxetanes, and 1,8- and 1,10-bis(3-methyl-3-oxetanyl)-2,7-dioxaoctane and -2,9-dioxadecane were readily prepared in fairly good yields by the reaction of 3-hydroxymethyl-3-methyloxetane (1) with tetra- and hexamethylene dibromides in the presence of a phase-transfer catalyst. The formation of the mono- and disubstituted products depends upon the molar ratios of the dibromide to 1. The optimum reaction conditions for the etherification of 1 with tetramethylene dibromide were searched. The (ω-bromo-2-oxaalkyl)oxetanes were polymerized to give soluble polyoxetanes (\barMn 3500–5500) by cationic ring-opening polymerization. The use of the bisoxetanes, a new cross-linking agent, as a comonomer gave insoluble elastic polyoxetane resins having a pendant bromide at the spacer end.
3-(6-溴-2-氧杂己基和8-溴-2-氧杂辛基)-3-甲基氧杂环丁烷,以及1,8-和1,10-双(3-甲基-3-氧杂环丁基)-2,7-二氧杂辛烷和-2,9-二氧杂癸烷,通过3-羟甲基-3-甲基氧杂环丁烷(1)与四亚甲基和六亚甲基二溴化物在相转移催化剂存在下的反应,以相当不错的产率方便地制备得到。单取代和双取代产物的形成取决于二溴化物与1的摩尔比。探索了1与四亚甲基二溴化物醚化反应的最佳条件。(ω-溴-2-氧杂烷基)氧杂环丁烷通过阳离子开环聚合反应聚合,得到可溶性聚氧杂环丁烷(平均分子量3500-5500)。作为新的交联剂,双氧杂环丁烷作为共聚单体使用,产生了具有间隔末端悬挂溴的不溶性弹性聚氧杂环丁烷树脂。