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CuBr was found to be an efficient catalyst

  • The development of novel, clean, and efficient methods for the preparation of compounds is a major research focus in organic chemistry at the moment. In this context, copper bromide - CuBr has been utilized as a heterogeneous catalyst for a highly efficient, eco-sustainable, and greener synthesis of β-enaminone derivatives by condensation of 1,3-diketones with various primary amines at room temperature under ultrasound irradiation and solvent-free conditions. The structure of the synthesized compounds was confirmed by 1H, 13C NMR spectroscopy, IR spectroscopy, and elemental analysis. The desired products were obtained in excellent yields (90–98%) within short reaction times (20–50 min).
    CuBr Catalyzed C–N cross coupling reaction of purines and diaryliodonium salts to 9-arylpurines
    CuBr was found to be an efficient catalyst for the C–N cross coupling reaction of purine and diaryliodonium salts. 9-Arylpurines were synthesized in excellent yields with short reaction times (2.5 h). The method represents an alternative to the synthesis of 9-arylpurines viaCu(II) catalyzed C–N coupling reaction with arylboronic acids as arylating agents.
    The solubility of CuBr in water at 25 degree C is measured to be 0.010 g/L. Use the information to calculate
    for CuBr. Round your answer to 2 significant digits.

    Pursuing this goal, a team of researchers introduced the formally 0-Dimensional (R-/S-MBA)2CuBr4 containing chiral R-/S-α-methyl benzylamine (R-/S-MBA) connected to highly distorted, relatively isolated CuBr4 tetrahedral units in alternating layers, deriving extraordinary chiro-optical properties. The team consists of Ranjan Das and DD Sarma at the Solid State and Structural Chemistry Unit, IISc, along with Modasser Hossain and Pralay K Santra at CeNS, Bengaluru, Arup Mahata and Filippo De Angelis at Perugia, Italy, and Diptikanta Swain at ICT-IOC, Bhubaneswar.

    In this study, the researchers described how the pronounced chirality of the organic molecule (R-/S-MBA) is abundantly transferred to the inorganic units, CuBr4. In the orange-red part of the visible spectrum, this compound’s chiral anisotropy factor, gCD, is the highest reported for any hybrid material. The study shows that the chirality is transferred from the organic units to the inorganic layer through the extensive asymmetric hydrogen bonding network and electronic coupling, driving the CuBr4 tetrahedral units to follow the 21-screw axis.