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Title: Synthesis, characterisation of new chromanoisoxazoles and investigation of optical power limiting properties
Authors: Murthy, Y L N
Prabha, R Surya
Shettigar, Seetharam
Issue Date: Feb-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int.CI.7C 07D 261/02
Abstract: Five new chromanoisoxazoles are prepared by the common (3+2) route. Chalcones on condensation with hydroxylamine hydrochloride furnish 3-substituted phenyl-5-(2" ,2" -dimethyl-7" -hydroxychroman)isoxazoles. Chalcones, have been prepared from resorcinol by acetylation. Resacetophenone thus formed on nuclear prenylation with isoprene/PPA affords 7-hydroxy-6-acetyl- 2',2'-dimethylchroman. This on treatment with substituted benzaldehydes forms chalcones 1-5.Compounds 1-5 react with hydroxylamine hydrochloride in the presence of KOH/EtOH resulting in the formation of chromano isoxazoles 6-10, which are identified and characterized by IR, 1H NMR, 13C NMR and mass spectral data. The physico-chemical parameters (absorbance and fluorescence) have been studied for two newly synthesized isoxazoles. Besides the above studies, the optical power limiting performances have also been measured at 532 nm with nano second pulses for the above isoxazoles. The variation of the transmitted power corresponding to the incident power showed a decrease in the transmitted power to a greater extent. The curve corresponding to 7 mm solution path shows that the transmitted power gets saturated with the input intensity which shows the optical limiting behaviour.
Page(s): 361-366
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.43B(02) [February 2004]

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