Desaurin derivatives

Active methylene compounds with carbon disulfide and base form reactive salts which undergo [3 +1] additions to a variety of alkylating agents, even gem-dihaloethylenes (Scheme 29) (77CC207, 80S907). The salts can be oxidized to symmetrical desaurin derivatives (Scheme 30) (62CB2861). 

H. Behringer and E. Meinetsberger, Thiophene derivatives and 1,2-trithiones from l,2-dithiol-3-one /7-toluenesulfonylhydrazones and desaurins. Tetrahedron Lett. 1915 (1973). 

Ring-opening of 2,2,4,4-tetrakis(trifluoromethyl)-l,3-dithietan occurs on treatment with potassium fluoride, hexafluoropropene, and cuprous bromide, or with potassium fluoride, alcohols, and copper(i) or silver salts. Treatment of the desaurin (80) with o-amino-phenols gives oxazepine derivatives, and with o-phenylenediamines, diazepines. ... 

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