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S. D.  Mitragotri, Pore, D. M., Desai, U. V., and Wadgaonkar, P. P., ?Sulfamic acid: an efficient and cost-effective solid acid catalyst for the synthesis of alpha-aminophosphonates at ambient temperature?, Catalysis Communications, vol. 9, no. 9, pp. 1822-1826, 2008.\par \par S. S.  Sonar, Shelke, K. F., Kakade, G. K., Shingate, B. B., and Shingare, M. S., ?Alum: an efficient catalyst for one-pot synthesis of alpha-aminophosphonates?, Chinese Chemical Letters, vol. 20, no. 9, pp. 1042-1046, 2009.\par \par S. S.  Sonar, Sadaphal, S. A., Shitole, N. N., Jogdand, N. R., Shingate, B. B., and Shingare, M. S., ?Alum catalyzed convenient synthesis of quino [2,3-b][1,5]benzoxazepine alpha-aminophosphonate derivatives?, Bulletin of the Korean Chemical Society, vol. 30, no. 8, pp. 1711-1714, 2009.\par \par S. S.  Sonar, Kategaonkar, A. H., Ware, M. N., Gill, C. H., Shingate, B. B., and Shingare, M. S., ?Ammonium metavanadate: an effective catalyst for synthesis of alpha-hydroxyphosphonates?, Arkivoc, pp. 138-148, 2009.\par \par S. S.  Sonar, Sadaphal, S. A., Pawar, S. S., Shingate, B. B., and Shingare, M. S., ?Microwave assisted convenient synthesis of quino[2,3-b][1,5]benzoxazepines?, Chinese Chemical Letters, vol. 20, no. 5, pp. 557-561, 2009.\par \par A. K.  Bhattacharya, Rana, K. C., Mujahid, M., Sehar, I., and Saxena, A. K., ?Synthesis and in vitro study of 14-aryl-14H-dibenzo[a.j]xanthenes as cytotoxic agents?, Bioorganic & Medicinal Chemistry Letters, vol. 19, no. 19, pp. 5590-5593, 2009.\par \par S. P.  Borikar, Daniel, T., and Paul, V., ?Mild, efficient, and regioselective monobromination of arylamines and phenols using [BBIm]Br-3 as a new reagent?, Synthetic Communications, vol. 40, no. 5, p. PII 919083074, 2010.\par \par S. P.  Borikar and Daniel, T., ?Aromatic bromination of aldehydes and ketones using 1,3-di-n-butylimidazolium tribromide [BBIm]Br3 ionic liquids under solvent-free conditions?, Journal of the Iranian Chemical Society, vol. 8, no. 2, pp. 531-536, 2011.\par \par S. P.  Borikar and Daniel, T., ?Convenient and efficient protocol for the synthesis of acylals catalyzed by bronsted acidic ionic liquids under ultrasonic irradiation?, Ultrasonics Sonochemistry, vol. 18, no. 5, pp. 928-931, 2011.\par \par S. D.  Dindulkar, Puranik, V. G., and Jeong, Y. Tae, ?Supported copper triflate as an efficient catalytic system for the synthesis of highly functionalized 2-naphthol Mannich bases under solvent free condition?, Tetrahedron Letters, vol. 53, no. 33, pp. 4376-4380, 2012.\par \par V. R.  Choudhary, ?Highly efficient catalyst derived from Ni-Fe-hydrotalcite for solvent-free O- or S-acetylation of alcohols, phenols and thiols at room temperature?, Proceedings of the National Academy of Sciences India Section A-Physical Sciences, vol. 83, no. 1, pp. 15-19, 2013.\par \par M. A.  Kulkarni, Lad, U. P., Desai, U. V., Mitragotri, S. D., and Wadgaonkar, P. P., ?Mechanistic approach for expeditious and solvent-free synthesis of alpha-hydroxy phosphonates using potassium phosphate as catalyst?, Comptes Rendus Chimie, vol. 16, no. 2, pp. 148-152, 2013.\par \par D.  Bhuyan, Selvaraj, K., and Saikia, L., ?PD@SBA-15 Nanocomposite catalyst: synthesis and efficient solvent-free semihydrogenation of phenylacetylene under mild conditions?, Microporous and Mesoporous Materials, vol. 241, pp. 266-273, 2017.\par \par P. A.  Burate, Javle, B. R., Desale, P. H., and Kinage, A. K., ?Amino acid amide based ionic liquid as an efficient organo-catalyst for solvent-free knoevenagel condensation at room temperature?, Catalysis Letters, vol. 149, no. 9, pp. 2368-2375, 2019.\par \par D. K.  Pandey, Shabade, A. B., and Punji, B., ?Copper-catalyzed direct arylation of indoles and related (hetero)arenes: a ligandless and solvent-free approach?, Advanced Synthesis & Catalysis, vol. 362, no. 12, pp. 2534-2540, 2020.\par \par }