808
A. Tarassoli and M. R. Shushizadeh
2,3-Di(o-hydroxy phenylene)quinoxaline
To a warm solution of 2.42 g (0.01 mmol) of 2,20-dihydroxybenzil in
8 ml of absolute ethanol was added a solution of 1.1 g (0.01 mmol) of
o-phenylenediamine in 8 ml of absolute ethanol. It was warmed in a
water bath for 30 min, then water was added until a slight cloudiness
formed; it was then allowed to cool. Filteration and recrystallization
from aqueous ethanol, had a m.p. of 145–146 C (yield 50%).
Tris [2,3-Di(o-oxyphenylene)quinoxaline]-
cyclotriphosphazene
A mixture of hexachlorocyclotriphosphazene (5 g, 0.0144 mmol) 2,3-
di(o-hydroxyphenylene) quinoxaline (12.56 g, 0.0432 mmol), sodium
carbonate (9.16 g, 0.0864 mmol), and tetrahydrofurane (500 ml) was
refluxed for a total of 17 h and was stirred at 25 C for a further 40 h.
The white residue was then filtered off and washed with a large excess
of water until the washing were no longer basic to litmus. A portion of
the residue was recrystallized from xylene at 200 C. It produced white-
yellow crystals of tris[2,3-di(o-oxyphenylene) quinoxaline] cyclotriphos-
phazene which did not melt up to 300 C (yield 38%).
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