Réaction #4990

Équation de réaction

methyl methacrylate

phenothiazine

→

Butyl Methacrylate

Solvants

1-butanol

Conditions de réaction

Traitement

1. 1
   workup.ADDITIONcontaining a 5
2. 2
   Autreequipped with an agitatior
3. 3
   workup.DISTILLATIONthermocouple, and a 10-tray Oldershaw fractional distillation column
4. 4
   workup.ADDITIONThirty grams of the heterogeneous zirconium vinylbenzyl acetylacetonate/styrene/divinylbenzene catalyst was added
5. 5
   TempératureThe mixture was heated
6. 6
   Températureto reflux at atmospheric pressure while an azeotropic mixture of methyl methacrylate and methanol
7. 7
   Autrewas removed from the upper portion of the fractionating column
8. 8
   Autrewas 64°-67° C.
9. 9
   Autrepot was 101°-107° C

Mode opératoire

Two hundred six grams of a reaction mix containing a 5:1 mole ratio of methyl methacrylate, 1-butanol, and 100 ppm phenothiazine as inhibitor were added to a 500 ml flask equipped with an agitatior, thermocouple, and a 10-tray Oldershaw fractional distillation column. Thirty grams of the heterogeneous zirconium vinylbenzyl acetylacetonate/styrene/divinylbenzene catalyst was added. The mixture was heated to reflux at atmospheric pressure while an azeotropic mixture of methyl methacrylate and methanol was removed from the upper portion of the fractionating column. The reaction was continued in this manner for 6 hours while the temperature at the column was 64°-67° C. and the temperature in the pot was 101°-107° C. Gas liquid chromatography (GLC) analysis showed 60% conversion of 1-butanol with a selectivity to butyl methacrylate of 99%.

Source