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a synthetic
procedure described below. The characterization data has been given for ST-
12 as a representative case. In a typical reaction, a mixture of 1,3,5-triformyl-
phloroglucinol (0.4 mmol, 1 equiv) and 3,4,5-tris(alkoxy)benzohydrazides 2-n
(1.6 mmol, 4 equiv) in absolute ethanol (15 ml) was heated at reflux under
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mixture of ethanol–dichloromethane (9:1) to obtain pure pale yellow solids.
Yield: 70%; a gummy mass [Found: C, 74.70, H, 10.63, N, 3.7. C138H240N6O15
requires C, 74.55, H, 10.88, N, 3.78]; UV–vis: kmax = 360.9 nm,
e
= 2.4 Â 102 L molÀ1 cmÀ1
,
275.4 nm,
e
= 6.3 Â 103 L molÀ1 cmÀ1
; IR (KBr
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3 Â NH), 8.5 (br s, 3H, 3 Â CH@N), 7.25 (s, 6H, Ar), 3.97 (br s, 18H, 9 Â OCH2),
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