Propanal → 2-Ethyl-1,3-benzothiazole

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Reaction Steps

The procedure of Example 1 was repeated, except that the reactants consisted of 37.5 g. of 2-aminothiophenol and 17.5 g. of propionaldehyde. The residue which remained after the removal of solvent was distilled in vacuo, chromatographed on a silica gel column with toluene as eluant, and redistilled at 94°-104°/0.3 mm. to give 2-ethylbenzothiazoline. The following elemental micro-analysis was obtained:

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