Mild aromatic palladium-catalyzed protodecarboxylation: kinetic assessment of the decarboxylative palladation and the protodepalladation steps.

Mild aromatic palladium-catalyzed protodecarboxylation: kinetic assessment of the decarboxylative palladation and the protodepalladation steps.
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DOI:
10.1021/jo400222c
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发表时间:
2013-05-17
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Kozlowski MC
Kozlowski MC
中科院分区:
其他
文献类型:
--
作者:
Dickstein JS;Curto JM;Gutierrez O;Mulrooney CA;Kozlowski MC

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Mechanism studies of a mild palladium catalyzed decarboxylation of aromatic carboxylic acids are described. In particular, reaction orders and activation parameters for the two stages of the transformation were determined. These studies guided development of a catalytic system capable of turnover. Further evidence reinforces that the second stage, protonation of the aryl palladium intermediate, is the rate-determining step of the reaction. The first step, decarboxylative palladation is proposed to occur through an intramolecular electrophilic palladation pathway, which is supported by computational and mechansim studies. In contrast to the reverse reaction (C-H insertion), the data support an electrophilic aromatic substitution mechanism involving a stepwise intramolecular protonation sequence for the protodepalladation portion of the reaction.
DOI: 10.1107/s0108270189001459
发表时间: 1989-09-15
期刊: ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
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