Facile conversion of cis into trans oxane as liquid crystals

Author:

Dong Zhaoheng,Fan Ping,Chen Qun,Chen ChenORCID

Abstract

AbstractTrans-oxanes are important liquid crystals. The commonly used techniques for the synthesis were to react 2-substituted propylene glycols with substituted formaldehydes. Such process produces toxic cis-oxanes, which are harmful to the environment. The cis to trans isomerization of wasted cis-oxanes was studied in the presence of p-toluenesulfonic acid as catalyst. The yield of cis to trans conversion was over 70%, which was much higher than 42–69% when traditional methods were employed. The total yield of the new method was increased to 90%. Further investigation of effects of catalysts, reaction times, temperatures on the cis-trans conversion was carried out. Proposed mechanism of this process for the conversion was discussed.

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

Reference16 articles.

1. Han, Y., Wang, K., Zhang, J., Li, Z. & Zhang, F. Synthesis and properties of 3, 5-difluorotolane liquid crystal compounds. Chin. J. Liq. Cryst. Displays. 28, 683–687 (2013).

2. Yun, G., Zheng, C. C. & Hua, R. Preparation and characteristics of terminal alkeny-bearing lateral fluoro-benzene negative liquid crystals. Chin. J. Liq. Cryst. Displays. 28, 510–515 (2013).

3. Hirata, K. Production of tetrahydro-2H-pyran derivative used as component of liquid crystal medium, involves applying oxane compound as intermediate. EP3228617-A1 (2017).

4. Masahiro, H. Manufacture of compound containing oxane and dihalophenyl groups used in N-type liquid crystal material, involves coupling compound containing oxane group and compound containing dihalophenyl group in presence of transition metal catalyst. WO2019035408-A1 (2019).

5. LI, Y., Song, Y., Zhou, H. & Wang, X. Anhydrous offset sprinkle ink printing plate manufacturing method, involves covering silicon rubber layer with ink area to prepare anhydrous offset sprinkle ink printing plate, and removing water-soluble high polymer or waste liquid. CN104742491-A; CN104742491-B[P] (2015).

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3