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Experimental General 1 H NMR and 13 C NMR spectra were recorded at 400 MHz, in deuteriochloroform at ambient temperature on a Bruker Avance DRX 400 spectrometer. Chemical shifts are given in δ (ppm) relative to tetramethylsilane (deuteriochloroform) as internal standards. Elemental analyses were performed with a Perkin-Elmer CHNS-2400 Ser II Elemental Analyzer. IR spectra were measured on a Perkin-Elmer model 1000 FT-IR spectrophotometer. Melting points were determined on a Kofler apparatus anddoi:10.1039/b613117d fatcat:zdnvvwcymfhf5brf6rsx2dti7m