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D. A.  Kambale, Borade, B. R., and Kontham, R., ?Bismuth(iii)-catalyzed bis-cyclization of propargylic diol-esters: a unified approach for the synthesis of [5,5]- and [6,5]-oxaspirolactones?, Organic & Biomolecular Chemistry, vol. 19, no. 30, pp. 6618-6622, 2021.

P.  Kataria, Sahoo, S. Shekhar, and Kontham, R., ?Bi(III)-catalyzed synthesis of substituted furans from hydroxy-oxetanyl ketones: application to unified total synthesis of shikonofurans J, D, E, and C?, Journal of Organic Chemistry, vol. 88, no. 11, pp. 7328-7346, 2023.

M. S.  Pratapure and Kontham, R., ?Bismuth(III)-catalyzed cascade condensation of alkynyl alcohols with terminal alkynes: a facile construction of propargyl cyclic ethers?, Tetrahedron Letters, vol. 114, p. 154274, 2023.

A. B.  Rathod, Borade, B. R., Sambherao, P. I., and Kontham, R., ?Bi(OTf)3-promoted cascade annulation of hydroxy-pyranones and unsaturated ?-ketoesters for the construction of polycyclic bridged pyrano-furopyranones?, Organic and biomolecular chemistry, vol. 22, no. 3, pp. 496-500, 2024.

R.  Vinodkumar, Nakate, A. K., Sharma, H., Vanka, K., Krishna, G. Rama, and Kontham, R., ?Bronsted acid-promoted cyclodimerization of ?,?-unsaturated ?-ketoesters: construction of fused pyrano-ketal-lactones and ?-ylidene-butenolides?, ACS Omega, vol. 9, no. 18, pp. 19859-19878, 2024.