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Ni(0)-Catalyzed Dimerization of o-Keto Carboxylic Acid Pseudochlorides

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Abstract

A new protocol of the synthesis of 3,3′-diaryl-3,3′-diphthalides by dehalogenation of o-keto carboxylic acid pseudochlorides is implemented. The feature of the new protocol is that the reaction is carried out in the presence of a zero-valent nickel complex catalyst generated in situ by mixing zinc powder, nickel(II) chloride, triphenylphosphine, and 2,2′-bipyridine. Along with the target dimerization products of pseudochlorides, minor products were isolated, whose structure allowed to propose possible schemes of side reactions.

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Acknowledgments

The elemental analyses, IR and NMR spectra were obtained and semipreparative HPLC separation was performed at the “Khimiya Center for Collective Use”, Ufa Institute of Chemistry UFRC RAS. X-ray diffraction analysis was performed at the Agidel Center for Collective Use, Institute of Petrochemistry and Catalysis UFRC RAS.

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Correspondence to V. A. Kraikin.

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Russian Text © The Author(s), 2019, published in Zhurnal Organicheskoi Khimii, 2019, Vol. 55, No. 5, pp. 773–781.

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Yangirov, T.A., Fatykhov, A.A., Sedova, E.A. et al. Ni(0)-Catalyzed Dimerization of o-Keto Carboxylic Acid Pseudochlorides. Russ J Org Chem 55, 670–677 (2019). https://doi.org/10.1134/S1070428019050142

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  • DOI: https://doi.org/10.1134/S1070428019050142

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