TY JOUR TI Comparative quantum-chemical analysis of the reactivity of 1-phenilbut-2-en-3-tyon and 2-(N-pirrolidinil)pent-2-en-4-tyon as heterodiens in the Diels - Alder reaction KW unsaturated thiocarbonyl com-pounds KW the Diels-Alder hetero-reaction KW thiopyranes synthesis KW quantum-chemical modelling KW AM1 method JO From Chemistry Towards Technology Step-By-Step AU Ovchinnikov, K.L. AU Karpov, I.D. AU Starostin, M.V. AU Kolobov, A.V. PY 2021 IS 2 PB Yaroslavl State Technical University