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    • DIPESH M SHARMA

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    • Volume 129 Issue 8 August 2017 pp 1161-1169 REGULAR ARTICLE

      Synthesis and characterization of six-membered pincer nickelacycles and application in alkylation of benzothiazole

      HANUMANPRASAD PANDIRI DIPESH M SHARMA RAJESH G GONNADE BENUDHAR PUNJI

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      Six-membered pincer nickelacycle complexes have been synthesized and employed for the catalytic C–H bond alkylation of benzothiazole. The pincer nickelacycle, {κP, κC, κP-(2-i Pr₂ POCH₂ C₆H₃-6-CH₂OPi Pr₂)}NiBr, [(i Pr₄-POCCCOP)NiBr (2)] was synthesized by the reaction of 1,3-i Pr₂POCH₂-C₆H₄-CH₂OPi Pr₂ [(i Pr₄-POCCCOP)−H (1)] with (CH₃CN) ₂NiBr₂ in the presence of Et₃N via the C(2)–H activation on ligand 1. Treatment of [(i Pr₄-POCCCOP)NiBr] (2) with AgOAc afforded the complex [(i Pr₄-POCCCOP)Ni(OAc)] (3) in good yield. Both the complexes 2 and 3 were characterized by ¹H,¹³C and ³¹P-NMR spectral analysis. Further, the molecular structures of complexes 2 and 3 were established by X-ray crystallography. The complex 2 was found to be an active catalyst for the C–H bond alkylation of benzothiazole with alkyl halides containing β–hydrogen atoms.

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