Remote and Selective C(sp 2 )-H Olefination for Sequential Regioselective Linkage of Phenanthrenes.
ORGANIC LETTERS(2020)
摘要
Biphenylcarboxylic acid with two competing C(sp(2))-H sites was designed for site selective C(sp(2))-H functionalization by developing carboxylic acids assisted remote and selective olefination via 7-membered palladacycle. Mechanism investigation and DFT calculations reveal a kinetics-determined process, which could be utilized to explore a variety of remote site selectivity. The practicability of this method was highlighted by the precise construction of phenathrene under sequential site selectivity.
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