2‐Pyran‐4‐Ylidene Malononitrile Based Conjugated Microporous Polymers as Metal‐Free Heterogeneous Photocatalysts for Organic Synthesis

Author:

Liu Yuanbo1,Yang Liuliu1,Hou Yuxin1,Zhang Zhenwei1,Xiao Xiao2,Yue Huijuan3,Liu Xiaoming1ORCID

Affiliation:

1. College of Chemistry Jilin University Changchun 130012 P. R. China

2. College of Pharmacy Jilin Medical University Jilin 132013 P. R. China

3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

Abstract

AbstractPhotoactive conjugated microporous polymers (CMPs) as heterogeneous photocatalysts provide a sustainable alternative to classical metal‐based semiconductor photosensitizers. However, previously reported CMPs are typically synthesized through metal catalyzed coupling reactions, which bears product separation, but also increases the price of materials. Herein, a new type of sp2 carbon linked DCM‐CMPs are successfully designed and synthesized by organic base catalyzed Knoevenagel reaction using 2,6‐Dimethyl‐4H‐pyran‐4‐ylidene‐malononitrile and aromatic polyaldehydes as monomers. The new polymers feature inherent porosity, excellent stability, and fully π‐conjugated skeleton with broad visible‐light absorption. They effectively induce the synthesis of benzimidazole compounds under light irradiation, and exhibit wide substrate adaptability with outstanding recyclability.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jilin Province

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University

Publisher

Wiley

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