The site-selectivity and mechanism of Pd-catalyzed C(sp<sup>2</sup>)–H arylation of simple arenes
作者:Daeun Kim、Geunho Choi、Weonjeong Kim、Dongwook Kim、Youn K. Kang、Soon Hyeok Hong
DOI:10.1039/d0sc05414c
日期:——
functionalization reactions in organic synthesis. Despite the seminal breakthrough of the Pd-catalyzed C(sp2)–H arylation of simple arenes via a concerted metalation–deprotonation (CMD) pathway in 2006, understanding the site-selectivity of the reaction still remains elusive. Here, we have comprehensively investigated the scope, site-selectivity, and mechanism of the Pd-catalyzed direct C–H arylation reaction of
Palladium-Catalyzed Cross-Electrophile Coupling between Aryl Diazonium Salt and Aryl Iodide/Diaryliodonium Salt in H<sub>2</sub>O–EtOH
作者:Kartic Manna、Ranjan Jana
DOI:10.1021/acs.orglett.2c03932
日期:2023.1.20
chemoselective palladium-catalyzed cross-electrophile couplingbetween readily accessible aromatic diazonium salt and aryl iodide or diaryliodonium salt in water–ethanol (2:1) medium. Mechanistic studies revealed that ethanol is crucial to generate an active Pd(0) catalyst, and the counterion of the diazonium salt renders a cationic Pd(II) species that facilitates subsequent oxidative addition to aryl iodide/diaryliodonium
Synthesis and structures of (−) menthyl and (+) neomenthyl substituted enantio pure bis(1,2,3-triazol-5-ylidene)PdI 2 complexes and PEPPSI type (1,2,3-triazol-5-ylidene) (pyridine)PdI 2 complexes. Comparison of catalytic activities for C–C coupling
as precursors for the synthesis of the corresponding enantio pure bis(1,2,3-triazol-5-ylidene)PdI2 complexes with menthyl and neomenthyl wing tip groups. The palladium complexes were synthesized in high yields using a recently developed mild method under base free and silver free conditions at ambient temperature. These triazolium salts also served as precursors for the synthesis of the corresponding