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http://dx.doi.org/10.5012/jkcs.2003.47.2.137

Synthesis and Investigation of Mass Spectra of 3-(substituent)-benzopyran[3.2-c]-[1]-benzopyran-6,7-diones  

I. M. EI-Deen (Faculty of Education, Suez Canal University)
H.K. Ibrahim (Faculty of Science, Suez Canal University Ismailia Egypt)
Publication Information
Journal of the Korean Chemical Society / v.47, no.2, 2003 , pp. 137-146 More about this Journal
Abstract
3-Hydroxybenzopyran[3,2-c]-[1]-benzopyran-6,7-diones (3) and 3-methoxycarbonylcoumarin (4) were prepared via condensation of 1 with resorcinol in the presence of sodium methoxide. The chemical behavior of 3 towards acetic anhydride, alkyl halides and diazonium chloride is described. The electron impact ionization mass spectra of compounds 4,5 and 6a,b show a weak molecular ion peak and a base peak of m/z 89, m/z 280. m/z 91 and m/z 120 resulting from a cleavage fragmentation respectively. The molecular ion of compounds 3, 6b, and 7a is a base peak of m/z 280, m/z 366 and m/z 488 respectively. Compound 7a give a characteristic fragmentation pattern with a two very stable fragmentation of m/z 383 and m/z 77.
Keywords
Benzopyran[3,2-c]-[1]-benzopyran-6; 7-diones; Mass Spectrum; Synthesis;
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