An N-heterocyclic carbene functional covalent organic framework for Knoevenagel condensation reaction and γ-butyrolactone synthesis at room temperature

被引:1
作者
Zhang, Wenyao [1 ]
Wang, Biying [1 ]
Feng, Shulei [1 ]
Feng, Huijun [1 ]
Bai, Junhua [1 ]
Wang, Junwen [1 ]
机构
[1] Shanxi Normal Univ, Sch Chem & Mat Sci, Key Lab Magnet Mol & Magnet Informat Mat, Minist Educ, Taiyuan 030031, Peoples R China
关键词
DESIGN; ENALS;
D O I
10.1039/d4nj03210a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Covalent organic frameworks (COFs) have garnered extensive attention as promising candidates for heterogeneous catalysts, attributed to their high surface area and ease of functionalization. In this study, we present a functional imine COF, named Por-NHC-COF, which is meticulously synthesized through a Schiff base reaction between a porphyrin and an N-heterocyclic carbene (NHC) monomer building block. This new COF exhibits good crystallinity and high chemical and thermal stability. Notably, the as-synthesized Por-NHC-COF demonstrates a high catalytic efficiency for organic reactions under gentle conditions. One notable application is its efficacy in Knoevenagel condensation reactions, yielding the target product with exceptional yields (>99%) in a short reaction time (1 hour) at ambient temperature. Remarkably, both the crystallinity and catalytic performance remained unchanged even after 6 recycle tests, indicating the COF's robustness and recyclable nature. Under strong base conditions, the Por-NHC-COF exhibits distinct catalytic performance, due to the successful dehydrogenation of imidazolium into NHC, thereby enabling the catalytic synthesis of gamma-butyrolactone at room temperature. The versatile and adaptable nature of our Por-NHC-COF enables it to serve as a potent catalyst for a wide range of chemical transformations.
引用
收藏
页码:16813 / 16819
页数:7
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