 |
Synthesis and Electron Impact of Mass Spectra of 3-Substituted Chromeno[3,2-c]chromen-6,7-diones
El-Deen, I. M. and Ibrahim, H. K. Synthesis and Electron Impact of Mass Spectra of 3-Substituted Chromeno[3,2-c]chromen-6,7-diones Chemical Papers, Vol.58, No. 3, 2004, 200-204
|
|
|
Document type:
|
Článok z časopisu / Journal Article |
|
Collection:
|
Chemical papers
|
| |
| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n583a200.pdf
|
583a200.pdf |
application/pdf |
335.40KB |
0 |
| Author(s) |
El-Deen, I. M.
Ibrahim, H. K.
|
| Title |
Synthesis and Electron Impact of Mass Spectra of 3-Substituted Chromeno[3,2-c]chromen-6,7-diones
|
| Journal name |
Chemical Papers
|
| Publication date |
2004
|
| Year available |
2004
|
| Volume number |
58
|
| Issue number |
3
|
| ISSN |
0366-6352
|
| Start page |
200
|
| End page |
204
|
| Place of publication |
Poland
|
| Publisher |
Versita
|
| Collection year |
2004
|
| Language |
english
|
| Subject |
250000 Chemical Sciences
250300 Organic Chemistry
|
| Abstract/Summary |
3-Hydroxychromeno[3,2-c]chromen-6,7-dione (III) and 3-methoxycarbonylcoumarin (IV) were prepared via condensation of ethoxycarbonylcoumarin with resorcinol in the presence of sodium methoxide. The chemical behaviour of III towards acetic anhydride, alkyl halides, and diazonium chloride is described. EI mass spectrometric behaviour of compounds IV, 3-acetyloxy and 3-alkoxy derivatives shows 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 some chromenochromendiones is a base peak of m/z 280, m/z 366, and m/z 488, respectively. Diphenylazo-hydroxy derivative gives a characteristic fragmentation pattern with two very stable fragments of m/z 383 and m/z 77.
|
|
|
|
