Palladium-Catalyzed Vinylation of Haloazulenes and Halotropolones with Olefins. Utility of the Heck Reaction in the Conjugated Carbon Chain Preparation
Reactions of Tetrasulfur Tetranitride with Tropolone and Its Several Halogeno Derivatives. Preparations of 4<i>H</i>-Cyclohepta[<i>c</i>][1,2,5]thiadiazol-4-ones, 6<i>H</i>-Cyclohepta[<i>c</i>][1,2,5]thiadiazol-6-one, and 7<i>H</i>-Cyclohepta-[1,2-<i>c</i>:3,4-<i>c</i>′]bis[1,2,5]thiadiazol-7-ones
The reactions of tropolones with tetrasulfurtetranitride gave 4H-cyclohepta[c][1,2,5]thiadiazol-4-ones, 6H-cyclohepta[c][1,2,5]thiadiazol-6-one, and 7H-cyclohepta[1,2-c: 3,4-c′]bis[1,2,5]thiadiazol-7-ones (9–56% yields) in one step. The yields of the products were not improved so much under high pressure and by the addition of a radical initiator.