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Issue 26, 2019
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Palladium pincer complexes featuring an unsymmetrical SCN indene-based ligand with a hemilabile pyridine sidearm

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Abstract

A new unsymmetrical indene-based pro-ligand featuring thiophosphinoyle and methylpyridine sidearms 2 was prepared. Coordination and cyclometalation in the presence of [PdCl2(PhCN)2] and PS-DIEA afforded three well-defined 2-indenyl SCN pincer complexes 3a–c. The lability of the pyridine moiety has been evidenced upon treatment with triphenylphosphine and 2,6-dimethylphenylisocyanide. In addition, reversible C–Pd bond cleavage has been demonstrated under Brønsted acid/base conditions. The indenediide SCN pincer complex 4 was prepared by deprotonation of 3a in the presence of triphenylphosphine. Preliminary catalytic tests on the cycloisomerization of 4-pentynoic acid have underlined the impact of the pyridine sidearm on the catalytic activity.

Graphical abstract: Palladium pincer complexes featuring an unsymmetrical SCN indene-based ligand with a hemilabile pyridine sidearm

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Article information


Submitted
28 Feb 2019
Accepted
27 Apr 2019
First published
29 Apr 2019

Dalton Trans., 2019,48, 9801-9806
Article type
Paper

Palladium pincer complexes featuring an unsymmetrical SCN indene-based ligand with a hemilabile pyridine sidearm

P. Brunel, C. Lhardy, S. Mallet-Ladeira, J. Monot, B. Martin-Vaca and D. Bourissou, Dalton Trans., 2019, 48, 9801
DOI: 10.1039/C9DT00898E

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