Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (3): 20210690.doi: 10.7503/cjcu20210690

• Organic Chemistry • Previous Articles     Next Articles

Moisture Absorption Reaction and Fluorescence Property of Highly Active Michael System Based on Arylidenemalononitrile

LI Qiao, ZHAO Yang, WANG Enju()   

  1. Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education,Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province,College of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158,China
  • Received:2021-09-27 Online:2022-03-10 Published:2021-11-10
  • Contact: WANG Enju E-mail:enjuwang@163.com
  • Supported by:
    the Natural Science Foundation of Hainan Province, China(219MS043)

Abstract:

The phenols and alcohols as nucleophiles are common in oxa-Michael reaction, while H2O normally cannot react with Michael system 2,2'-{[5-(tert-butyl)-2-hydroxy-1,3-phenylene]bis(methaneylylidene)}dimalononitrile(1) was reported, which could rapidly absorb water in the air to afford a stable 2-[5-(tert-butyl)-3-(2,2- dicyano-1-hydroxyethyl)-2-hydroxybenzyli-dene]malononitrile(2via oxa-Michael addition. The high activity of compound 1 resulted from the synergistic effect among the two dicyanovinyl groups and the one hydroxyl group. In dimethyl sulfoxide(DMSO), compound 2 could quickly dehydrate to give compound 1 in the presence of various alkaline catalysts. In PBS buffer(pH=10), compound 2 immediately converted to compound 1, and then converted back to compound 2 slowly. When heat the silica gel plate loading compound 2, the fluorescence conversion from blue to red were observed. Hence, compound 2 adsorbed on silica gel might be developed into a thermosensitive fluorescent material. In addition, compound 2 adsorbed on silica gel showed fluorescence responses to some organic vapors.

Key words: Oxa-Michael reaction, Arylidenemalononitrile, Moisture absorption reaction, Fluorescence property

CLC Number: 

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