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The reaction of benzaldehyde, 2-aminobenzenecarbothioamide, potassium cyanide, and acetic acid yields tetrahydroquinazolinethione 7 and/or α-aminonitrile 11 under different conditions. These results are used to support the intermediacy of an imine 3 or its immonium ion in the formation of α-aminonitriles 5.
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WALIA et al. (1974) studied this question.
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