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Mass spectral fragmentation patterns of some new 3,7-dichloro-benzo[1,2-b:4,5-b′]dithiophene-2,6-dicarboxylic acid dianilides and 3,5-dichloro-dithieno[3,2-b:2′,3′-d]thiophene-2,6-dicarboxylic acid dianilides. II

The electron impact mass spectra of some benzo[1, 2- b:4, 5-b']dithiophene-2, 6-dicarboxylic acid dianilides and dithieno[3, 2-b:2', 3'-d]thiophene-2, 6- dicarboxylic acid dianilides are discussed. Dominant peaks in these dianilides are formed by the cleavage of a C-N bond on one side of an anilino group, These ions fragment further by the cleavage of a C-C bond on the other side of an anilino group and a CONRPhR' group may be lost directly, After loss of CO, the characteristic benzodithiophene radical cation, C10H2S2Cl2square./+, at m/z 256 and the dithienothiophene radical cation, C8S3Cl2square./+, at m/z 262 are formed from their respective precursor compounds.

mass spectra ; tienodithiophene dicarboxilic acid dianilides

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