Trithiocarbonates acyclic

Cyanothioformamides NC-CS-NR1 -COR2 (R1 = Ph or 4-02NC6H4 R2 = CF3 or Ph) comprise another class of reactive dienophiles (e.g. equation 40)36. The trithiocarbon-ate 61 adds to cyclopentadiene to yield 62 (equation 41 )37. Trithiocarbonate. SVS-dioxidcs 63 (Ar1 = d-MeCgHa or 4-CIC6H4 Ar2 = Ph or 4-CIC6H4) react instantly with cyclopentadiene to afford mixtures of endo- and exo-cycloadducts 64 and 65, respectively, in which the former predominate (equation 42)38. The adducts produced from acyclic dienes are unstable they readily eliminate arylsulfinic acids to yield thiopyrans (equation 43)38. 

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