التفاصيل البيبلوغرافية
| العنوان: |
A solvent-free synthesis of coumarins using a Wells-Dawson heteropolyacid as catalyst |
| المؤلفون: |
Romanelli, Gustavo Pablo, Bennardi, Daniel Oscar, Ruiz, Diego Manuel, Baronetti, Graciela Teresita, Thomas, Horacio Jorge, Autino, Juan Carlos |
| سنة النشر: |
2004 |
| المجموعة: |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
| مصطلحات موضوعية: |
Química, Coumarin, Heteropolyacid, Wells–Dawson catalyst, Pechmann reaction, 4-Methylumbelliferone |
| الوصف: |
Substituted coumarins are synthesized from phenols and b-ketoesters by the Pechmann reaction, using a Wells–Dawson heteropolyacid (H6P2W18O62Æ24H2O) as catalyst by a solvent-free procedure. This one requires low reaction times, 130°C temperature and as little as 1mol% of Wells–Dawson acid, obtaining good to excellent yields of coumarins. The catalyst showed to be reusable with no differences in the yields. The results are compared with those of the reactions performed in toluene solution. The presented synthetic procedure is a convenient, clean and fast alternative for synthesizing 4-substituted coumarins (17 examples). ; Laboratorio de Estudio de Compuestos Orgánicos ; Centro de Investigación y Desarrollo en Ciencias Aplicadas ; Universidad de Buenos Aires ; Consejo Nacional de Investigaciones Científicas y Técnicas |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf; 8935-8939 |
| اللغة: |
English |
| تدمد: |
0040-4039 |
| Relation: |
http://sedici.unlp.edu.ar/handle/10915/156371 |
| الاتاحة: |
http://sedici.unlp.edu.ar/handle/10915/156371 |
| Rights: |
http://creativecommons.org/licenses/by/4.0/ ; Creative Commons Attribution 4.0 International (CC BY 4.0) |
| رقم الانضمام: |
edsbas.B0EAF39B |
| قاعدة البيانات: |
BASE |