Studies in the usnic acid series. I. The condensation of (+)-usnic acid with aliphatic and aromatic amines

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Abstract
Detailed investigations concerned with the reaction of usnic acid (1) and dihydrousnic acid (14) with a variety of aliphatic and aromatic amines are described. Extensive analyses of the characteristic spectroscopic data allow structural assignments for all the isolated products. The correctness of these assignments is established by an X-ray analysis of one of the products resulting from the reaction of usnic acid with ammonia.

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