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The nature of two self-condensation products of o-aminobenzaldehyde (one a bisanhydro trimer and the other a trisanhydro tetramer) formed under different conditions of acid catalysis has been reexamined Spectroscopic evidence is presented to support the assignment of structures V (R = H) and VIII (R = R′ = H) to these.
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S. G. McGeachin (1966) studied this question.
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