(2E, 6E)‐2, 6‐Bis(organylchalogenylmethylidene) substituted 1, 4‐dithiane 1, 1, 4, 4‐tetraoxides and N‐organyl thiomorpholine 1‐oxides as new S‐oxide derivatives of bis(2‐organylchalcogenylvinyl) sulfides. Issue 2 (10th June 2018)