1.3- Benzodithiolium salts

Acyl chlorides also react with various benzene-1,2-dithiols, leading to 1,3-benzodithiolium salts. Moderate yields (11-70%) are reported for a range of 2-alkyl and 2-aralkyl examples. ... 

By reaction of acetic or benzoic esters with benzene-1,2-dithiol in tetra-fluoroboric acid/ether complex, 2-methyl- or 2-phenyl-1,3-benzodithiolium salts are easily prepared in excellent yields. 

Dialkylamino and 2-ethylthio-I,3-dithiolium salts are cleaved by hydrogen sulfide,or sodium hydrosulfide,giving l,3-dithiole-2-thiones in excellent yields. Sodium sulfide and sodium hydrosulfide react with 1,3-benzodithiolium salts in methanol giving the sulfide 158 and the dithiole 159. 

Ammonia and aromatic and aliphatic primary amines react similarly with a double molar amount of a 4,5-diphenyl-1,3-dithiolium or 1,3-benzodithiolium salt. Both amino hydrogens are replaceable by l,3-benzodithiol-2-yl groups, leading to compounds With secondary aliphatic... 

Many spectra of 2-substituted 1,3-benzodithiolium salts have been measured. 2-Phenyl-1,3-benzodithiolium tetrafluoroborate in acetonitrile containing 2% H2SO4 absorbs at 247, 290, and 389 nm (log e = 3.67, 3.66, 4.39). Introduction of electron-donor substituents in the para position induces a bathochromic shift. ... 

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