Pd(II) coordinated deprotonated diphenyl phosphino amino pyridine: reactivity towards solvent, base, and acid

Sanjay Pratihar; Rupa Pegu; Ankur Kanti GuhaBipul Sarma

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Pd(II) coordinated deprotonated diphenyl phosphino amino pyridine: reactivity towards solvent, base, and acid

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The reactivity and stability of P(III)-N and P(III)≈N bonds will be different towards various solvents, bases, and acids because of their difference in bond strength due to different N-pπ-P-dπ donor bonding. For this, a P≈N containing Pd(II) complex, Pd(DPAP)_2 (C1), was synthesized from the reaction between PdCl_2(COD) (COD = 1,4-cyclooctadiene) and 2 equiv. DPAP (diphenyl phosphino amino pyridine) ligand, followed by deprotonation of the N-H proton of the coordinated DPAP. The reactivity and stability of coordinated P≈N in complex C1 were determined in various protic and aprotic solvents, bases, and acids. The inertness of coordinated PvN towards various solvents and bases was observed, whereas protonation occurs at the nitrogen of PvN in the presence of an acid to form P-NH, with the generation of dicationic palladium complexes (C2). The dicationic complex C2 is found to be stable in the presence of bulky monoanionic Sn(IV) reagents, whereas, in the presence of more nucleophilic anions like Br~- or I~-, dissociation of one DPAP ligand from dicationic Pd(II) complexes C2 leads to the generation of Pd(DPAP) X_2 (X = Br~-, I~-). Finally, the utility of the complexes towards Suzuki coupling of various aryl bromides and aryl or heteraryl boronic acids has been checked.

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《Dalton transactions: An international journal of inorganic chemistry》 |2014年第45期|17136-17144|共9页
作者
Sanjay Pratihar; Rupa Pegu; Ankur Kanti GuhaBipul Sarma;
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作者单位

Department of Chemical Sciences, Tezpur University, Napaam, 784028 Assam, India;

Department of Chemistry, Dibrugarh University, Dibrugarh, 786004 Assam, India;

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正文语种英语
中图分类化学;无机化学;
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Pd(II); coordinated; deprotonated;

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Pd(II) coordinated deprotonated diphenyl phosphino amino pyridine: reactivity towards solvent, base, and acid

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