Some Unusual Reactions of Disodium 2‐Oxo‐1,3‐dithiole‐4,5‐dithiolates with BiselectrophilesReaction of disodium 2‐oxo‐1,3‐dithiole‐4,5‐dithiolate(3)with dichloro‐maleic anhydride(4), Mucobromic acid(7)and its pseudoester9leads to the formation of the 1,3‐dithiolo[4,5‐b]‐1,4‐dithiins6, 8and10. 3condenses withcis‐3,5‐dibromo‐cyclopentene(15)to yield the tricyclic compounds16and17. 3is silylated by trimethylsilyltriflate(19)to give the unstable bis(trimethylsilyl)‐thioether20which reacts with aldehydes and ketones to furnish the 1,3‐d