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Palladium Complexes of 8-(Di-tert-butylphosphinooxy) Quinoline by Bruno Crociani; Simonetta Antonaroli; Marcello Burattini; Franco Benetollo; Alberto Scrivanti; Matteo Bertoldini is a Chemistry article available to read on EtoBox.

What is Palladium Complexes of 8-(Di-tert-butylphosphinooxy) Quinoline about?

The preparation of the new ligand 8-(di-tert-butylphosphinooxy)quinoline (1) and the palladium derivatives [PdCl 2 (1)] ( 2), [Pd(g 3 -all)(1)] + [all = C 3 H 5 (3a), 1-PhC 3 H 4 (3b) and 1,3-Ph 2 C 3 H 3 (3c)] and [Pd(g 2ol)(1)] [ol = dimethyl fumarate (4a) and fumaronitrile (4b)] is reported. The cationic species 3a-3c have been isolated as BF À 4 salts. The complex 3a(BF 4 ) is obtained either from the reaction of 1 with [Pd(l-Cl)(g 3 -C 3 H 5 )] 2 or from the reaction of ClP(CMe 3 ) 2 with [Pd(g 3 -C 3 H 5 )(8-oxyquinoline)], followed in both cases by chloride abstraction with NaBF 4 . In the complexes, the ligand 1 is P,N chelated to the central metal, as shown by the X-ray structural analysis of 3a(BF 4 ). At 25 °C in solution, 3a(BF 4 ) and 3b(BF 4 ) undergo a fast g 3 Àg 1 Àg 3 dynamic process which brings about a syn-anti exchange only for the allylic protons cis to phosphorus, while for 4a and 4b a slow rotation of the olefin around its bond axis to palladium takes place. The complexes 2 and 3a(BF 4 ) are efficient catalyst precursors in the coupling of the phenylboronic acid with aryl bromides and chlorides.

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Author

Bruno Crociani; Simonetta Antonaroli; Marcello Burattini; Franco Benetollo; Alberto Scrivanti; Matteo Bertoldini

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-328X)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)