Sulfoxide undergo thermal elimination via an E mechanism to yield vinyl alkenes and sulfenic acids. 
:CHS(O)CHCHR  →  CHSOH  +  CH=CHR
The acids are powerful antioxidants, but lack long-term stability. Some parent sulfoxides are therefore marketed as antioxidant polymer stabilisers. Structures based on thiodipropionate esters are popular. The reverse reaction is possible.