TY JOUR TI Quantum-chemical study of the regioselectivity of the diels-alder heteroreaction of α,β-unsaturated thiocarbonyl compounds with unsymmetrical dienophiles KW unsaturated thiocarbonyl compounds KW Diels-Alder heteroreaction KW thiopyrans KW quantum-chemical modelling KW density functional theory JO From Chemistry Towards Technology Step-By-Step AU Ovchinnikov, K.L. AU Starostin, M.V. AU Larionov, N.N. PY 2021 IS 2 PB Yaroslavl State Technical University