Regioselective preparation of cyclohexadienes or aromatic nitro compounds by Diels-Alder reactions of .beta.-sulfonylnitroolefins or .beta.-sulfinylnitroethylene
Regioselective preparation of cyclohexadienes or aromatic nitro compounds by Diels-Alder reactions of .beta.-sulfonylnitroolefins or .beta.-sulfinylnitroethylene