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      https://www.ias.ac.in/article/fulltext/jcsc/129/08/1161-1169

    • Keywords

       

      Pincer complex; six-membered nickelacycle; benzothiazole; C–H activation; alkylation.

    • Abstract

       

      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.

    • Author Affiliations

       

      HANUMANPRASAD PANDIRI1 DIPESH M SHARMA1 RAJESH G GONNADE2 BENUDHAR PUNJI1

      1. Organometallic Synthesis and Catalysis Group, Chemical Engineering Division, CSIR–National Chemical Laboratory (CSIR–NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
      2. Centre for Material Characterization, CSIR–National Chemical Laboratory (CSIR–NCL), Dr. Homi Bhabha Road, Pune 411 008, Maharashtra, India
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