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3,3,5-Trimethylcyclohexanone was subjected to Hantzsch synthesis by treating with iodine and thiourea to give an intermediate 2-Amino-5,5,7-trimethyl-4,5,6,7-tetrahydrobenzothiazole. This was then diazotized and coupled with various N,N-dialkylaniline derivatives to give a series of novel disperse dyes. These dyes were characterized by spectral studies. The dyeing performance of these dyes was assessed on polyester fabric.

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The structure of roxatidine acetate hydrochloride was studied by multinuclear NMR in two solvents DMSO-d