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Defect‐Rich Core‐Shell Carbon Derived from Ionic Liquid for Direct Synthesis of Imines
Author(s) -
He Peipei,
Lv Ying,
Shang Sensen,
Chen Bo,
Liang Hongliang,
Niu Jingyang,
Dai Wen
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202100763
Subject(s) - ionic liquid , catalysis , heteroatom , carbon fibers , dicyanamide , materials science , yield (engineering) , ionic bonding , oxide , pyrolysis , chemical engineering , metal , mesoporous material , chemistry , inorganic chemistry , organic chemistry , composite number , ion , metallurgy , composite material , ring (chemistry) , engineering
Development of metal‐free catalysis in chemical transformation is highly desirable due to its significant inherent advantages compared with conventional metal or metal oxide catalysts but challenging. Herein, ionic liquid 1‐ethyl‐3‐methylimidazolium dicyanamide and sodium tetraphenylborate were employed as joint precursors to facilely prepare micro‐mesoporous core‐shell carbon with specific surface area up to 2870 m 2 g −1 , consisting of smooth unpenetrated shell and secondary hollow spherical carbon core. The as‐obtained core‐shell carbon as metal‐free catalyst exhibited good performance for self‐coupling and cross‐coupling of amines to achieve the corresponding symmetry and asymmetry imines under mild and neat conditions. Excitingly, for the challenging aliphatic amines, the desired imines were achieved in our case in 55.9 % yield. The nearly linearly correlation between imine yield and I D /I G indicated that the resulting defects from departure of heteroatoms during pyrolysis may be active site.