Facile conversion of cis into trans oxane as liquid crystals

Trans-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 w...

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Autores principales: Dong, Zhaoheng, Fan, Ping, Chen, Qun, Chen, Chen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181715/
https://www.ncbi.nlm.nih.gov/pubmed/32332816
http://dx.doi.org/10.1038/s41598-020-63902-y
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author Dong, Zhaoheng
Fan, Ping
Chen, Qun
Chen, Chen
author_facet Dong, Zhaoheng
Fan, Ping
Chen, Qun
Chen, Chen
author_sort Dong, Zhaoheng
collection PubMed
description Trans-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.
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spelling pubmed-71817152020-04-27 Facile conversion of cis into trans oxane as liquid crystals Dong, Zhaoheng Fan, Ping Chen, Qun Chen, Chen Sci Rep Article Trans-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. Nature Publishing Group UK 2020-04-24 /pmc/articles/PMC7181715/ /pubmed/32332816 http://dx.doi.org/10.1038/s41598-020-63902-y Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Dong, Zhaoheng
Fan, Ping
Chen, Qun
Chen, Chen
Facile conversion of cis into trans oxane as liquid crystals
title Facile conversion of cis into trans oxane as liquid crystals
title_full Facile conversion of cis into trans oxane as liquid crystals
title_fullStr Facile conversion of cis into trans oxane as liquid crystals
title_full_unstemmed Facile conversion of cis into trans oxane as liquid crystals
title_short Facile conversion of cis into trans oxane as liquid crystals
title_sort facile conversion of cis into trans oxane as liquid crystals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181715/
https://www.ncbi.nlm.nih.gov/pubmed/32332816
http://dx.doi.org/10.1038/s41598-020-63902-y
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AT chenchen facileconversionofcisintotransoxaneasliquidcrystals

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