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Three 1,5-benzodiazepines viz., N5-chloroacetyl-, N5-piperazinoacetyl- and N5-morpholinoacetyl-2,2,4-trimethyl-1H-1,5-benzodiazepines have been synthesized. The structural characterisation and the conformational preferences of the compounds have been carried out using IR, 1D and 2D NMR spectral data. The NMR spectral data show that the N-acetyltetrahydro-1,5-benzodiazepines...