Synthesis and X-ray crystal Structures of Novel Spiro 1,3-Benzoxazine Dimers
1023, J. Chem. Res. 2002, (S) 473, (M) . 2002
Novel spiro 1,3-benzoxazine dimmers are obtained when hydrazones of
2-hydroxyacetophenone are treated with triphosgene. An X-ray crystal structure and the NMR and MS spectra of these new compounds are reported and discussed.
The reaction of hydrazones of 2-aminoacetophenone with triphosgene in dichloromethane or benzene in the presence of triethylamine gave quinazolines, pyrazolo[1,5-c]quinazoline and spiro…
Naturally occurring sesquiterpene lactones from Artemisia species which appeared in the literature during the last six years (1984-1989) have been reviewed.
Essential oils (EOs) from the stems and leaves of Origanum vulgare L. grown in Saudi Arabia and Jordan were analyzed by gas chromatography–mass spectrometry (GC–MS) and GC–flame ionization…