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T.  Joseph, Shanbhag, G. V., and Halligudi, S. B., ?Copper(II) ion-exchanged montmorillonite as catalyst for the direct addition of N-H bond to CC triple bond?, Journal of Molecular Catalysis A - Chemical, vol. 236, no. 1-2, pp. 139-144, 2005.\par \par G. V.  Shanbhag, Joseph, T., and Halligudi, S. B., ?Copper(II) ion exchanged A1SBA-15: a versatile catalyst for intermolecular hydroamination of terminal alkynes with aromatic amines?, Journal of Catalysis, vol. 250, no. 2, pp. 274-282, 2007.\par \par M.  Singh and Argade, N. P., ?Efficient convergent access to spiroketal segment of (+)-spiroxaline methyl ether?, Synthesis-Stuttgart, vol. 2, no. 1, pp. 1137-1141, 2011.\par \par R.  Kumar, Tewari, T., and Chikkali, S. H., ?Iron in organometallic transformations: a sustainable substitute for noble metals?, ChemCatChem, vol. 16, no. 19, 2024.\par \par R. B.  Pawar, Karmur, M. H., and Punji, B., ?Ligand-free MnBr2-catalyzed chemo- and stereoselective hydroboration of terminal alkynes?, Chemistry-an asian jounrnal, vol. 19, no. 9, 2024.\par \par }