A series of 3-O-haloacyl allobetulin were synthesized via acylation of allobetulin by haloacetic (trifluro,difluorochloro, trichloro, monochloro) acid in CHCl 3 at 70 °C. The structure of allobetulin was modified at C-3 position, and esters 3a-d were obtained in high yields. Moreover the reactions do not need a catalyst. The structures of all synthesized compounds were confirmed by various spectroscopic methods (IR and NMR) and tested for antioxidant activity.
Abstract. Improve and illustrate the etherification of tetramethylol glycoluril using excess of methyl and ethyl alcohols in the presence of acid catalyst like HCl and HNO 3 under temperature not exceeding 55 °C. Furthermore, attempts to obtain 1,4-diphenyl 1,2-dimethylol glycoluril which is a new compound from the condensation of 1,4 diphenyl glycoluril with formaldehyde in the presence of water under mild temperature. The techniques used to identify the compounds of the present study are: FTIR spectroscopy, HPLC and 13 C NMR spectroscopy.
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