nitrogen-containing heterocycles in the presence of 2,3-dimethyl-1,3-butadiene led to 6-benzoyl-5,6-dihydro-3,4-dimethyl-2H-thiapyran. This product was considered to be formed by the Diels-Alder reaction of the diene with thioaldehyde formed initially by the thermal decomposition of the sulfoxide.
热解苯甲酰甲基亚砜的轴承一些含氮杂环在导致6-苯甲酰基-5,6-二氢-3,
4-二甲基-2-
2,3-二甲基-1,3-丁二烯的存在ħ -thiapyran。该产物被认为是由二烯的Diels-Alder反应与最初通过亚砜的热分解而形成的
硫代醛形成的。