in benzene mixt. refluxed, resulting solid washed with petroleum ether; resulting solid washed with petroleum ether, dried under reduced pressure, elem. anal.;

acetic acid in benzene mixt. refluxed, resulting solid washed with petroleum ether; resulting solid washed with petroleum ether, dried under reduced pressure, elem. anal.;

benzoic acid in benzene mixt. refluxed, resulting solid washed with petroleum ether; resulting solid washed with petroleum ether, dried under reduced pressure, elem. anal.;