Anomalous Melt Condensation Behavior of Pure Isomers of Protocatechuic Acid Derivatives
作者:Kiyoshi Saito、Motomi Noguchi、Kentaro Takahashi、Kojun Utaka、Shin-ichi Yamamoto、Masaki Hasegawa
DOI:10.1246/cl.1996.131
日期:1996.2
Separation of a mixture of regio isomers of 6- and 7-carboxy-2-hydroxymethyl-1,4-benzodioxane (1) was successfully carried out by the fractional crystallization of their acetyl derivatives. Pure 1a (or 1b) gave an infusible product upon heating at 280 °C for 90 (or 30) min under reduced pressure, while a mixture of the regio isomers 1a and 1b polymerized to yield a high-molecular-weight spinnable polyester under the same conditions.
通过乙酰基衍生物的分级结晶,成功地分离了 6- 和 7-羧基-2-羟甲基-1,4-苯并二恶烷 (1) 的区域异构体混合物。纯的1a(或1b)在减压下于280℃加热90(或30)分钟后得到不熔的产物,而区域异构体1a和1b的混合物在减压下聚合得到高分子量可纺聚酯。相同的条件。