期刊
JOURNAL OF CATALYSIS
卷 426, 期 -, 页码 214-221出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2023.07.007
关键词
Hybrid ligands; Anti-Markovnikov; Linear carboxylic esters; Alkoxycarbonylation; Carbonylation; Palladium complexes
A series of bis-P,O-hybrid ligands were synthesized and characterized. The crystal structures showed that the ligand of L2 acted as a typical trans-positioned diphosphine as observed in the complexes Pd(L2)(OAc)2 and Pd(L2)Cl2, but also potentially as a P,P,O-tripodal pincer. Under mild conditions, L2 enabled Pd(OAc)2 to exhibit remarkable performance in the alkoxycarbonylation of vinyl arenes with high activity and excellent regioselectivity.
A series of bis-P,O-hybrid ligands (L1-L4) were synthesized and characterized. The crystal structures demonstrated that the ligand of L2, 1,4-bis((2-(diphenylphosphaneyl)phenoxy)methyl)benzene, not only acted as a typical trans-positioned diphosphine as observed in the complexes Pd(L2)(OAc)2 and Pd(L2)Cl2, but also potentially as a P,P,O-tripodal pincer. As a result, under mild conditions (80 degrees C, 0.5-3.0 MPa), L2 enabled Pd (OAc)2 to exhibit remarkable performance in terms of high activity and excellent regioselectivity (l/b > 97/3) in the alkoxycarbonylation of vinyl arenes with the isolated yields of 57-91 %.
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