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

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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, C10H2S2Cl2[symbol: see text], at m/z 256 and the dithienothiophene radical cation, C8S3Cl2[symbol: see text], at m/z 262 are formed from their respective precursor compounds.