Polyphenylens,Cross-Linked Through Pd-Carbene Complexes Formation,for Catalysis in Suzuki-Miyaura Reactions |
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Authors: | Dmiry A Rud Natalia S Kushakova Alexey V Shapovalov Alexander V Naumkin Irina V Zhidkova Irina A Khotina |
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Institution: | A. N. Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, Vavilova str. 28, 119991, Moscow, Russia |
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Abstract: | Polyphenylenes supported N-heterocyclic carbene Pd-complexes were synthesized for catalysis of cross-coupling Suzuki-Miyaura reactions. Starting polyphenylenes were prepared by cyclocondensation reaction of diacetylaromatic with monoacetylaromatic compounds. N-metylimidazole has been involved to the polymer through the mono-functional acetyl monomer, in which in p-position to acetyl group the group of haloalkyl was situated, and haloalkyl group interacted with N-methylimidazole. N-heterocyclic carbene complexes of Pd were synthesized usually by the reaction of imidazolium salts with the salts of transition metals in the presence of a base, obtaining the complex (N-heterocyclic carbene)2PdX2. The catalysis reaction was carried out between arylhalides (iodo- or bromobenzene) and phenylboronic acid with the presence of 1 mol% of Pd. The yields of biphenyl are from 70 to 95%, which is comparable with homogeneous catalysis. |
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Keywords: | cross-linked matrix organometallic catalysts polycondensation |
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