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- One of us (R. A. K.) is grateful to the Council of Scientific and Industrial Research (India) for the award of a research fellowship
- IR spectra were recorded on a Perkin-Elmer spectrophotometer. 1H NMR spectra were obtained with a Varian T-60 or FT-80 or WH-90 spectrometer using Me4Si as an internal standard. Mass spectral analyses were conducted using Finnegan MAT automated GC/MS 1020, electron impact 70 eV. All melting points were uncorrected and elemental analysis was satisfactory