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Title
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Pallada‐ and platinacycle complexes of phosphorus ylides; synthesis, X‐ray characterization, theoretical and electrochemical studies and application of Pd(II) complexes as catalyst in Suzuki‐ Miyaura coupling reaction
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Type
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JournalPaper
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Keywords
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DFT method, pallada‐ and platinacycle, phosphorus ylide, Suzuki‐Miyaura reaction, theoretical studies
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Abstract
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The new unsymmetrical phosphonium salts [Ph2PCH2PPh2CH2C(O)C6H4R]Br (R= m‐Br (S1) and p‐CN (S2)) were synthesized in the reaction of 1,1‐ bis(diphenylphosphino)methane (dppm) and BrCH2C(O)C6H4R (R= m‐Br and p‐ CN) ketones, respectively. Further treatment with NEt3 gave the α‐keto stabilized phosphorus ylides Ph2PCH2PPh2C(H)C(O)C6H4R (R= m‐Br (Y1) and p‐CN (Y2)). These ligands were reacted with [MCl2(cod)] (M= Pd and Pt; cod= 1,5‐ cyclooctadiene) to give the pallada‐ and platinacycle complexes [MCl2(Ph2PCH2PPh2C(H)C(O)C6H4R)] (M= Pd, R= m‐Br (3); R= p‐CN (4) and M= Pt, R= m‐Br (5); R= p‐CN (6)). Cyclic voltammetry, elemental analysis, IR and NMR (1H, 13C and 31P) spectroscopic methods were used for characterization of the obtained compounds. Further, the structure of complexes 3 and 4 were characterized crystallographically. Palladacycles 3 and 4 were proved to be excellent catalysts for the Suzuki‐Miyaura coupling reactions of various aryl chlorides and arylboronic acids in mixed DMF/H2O media. Also, the bonding situations between two interacted fragments [PtCl2] and Y1 and Y2 ligands in platinacycles 5 and 6 were investigated based on DFT method by using NBO, EDA and ETSNOCV analysis.
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Researchers
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Robert W. Gable (Not In First Six Researchers), Mehdi Bayat (Fifth Researcher), (Fourth Researcher), (Third Researcher), Asieh Sedghi (Second Researcher), seyyed javad seyyadzadeh sabounchei (First Researcher)
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