Leucarins

Even less structural information is available on the leucarins or triphenylmethane type dyes, which are a natural result of the condensation of aldehydes with phenols. It is clear that the products of the Reimer-Tiemann reaction can react further with themselves as well as with the starting phenol to yield a delightful variety of colored materials, erroneously called tars by some (e.g. 3). 

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