4-(2-methylpropyl)oxane-2,6-dione

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1 l, four-necked flask equipped with a mechanical stirrer, thermometer pocket and condenser, was charged with 3-isobutyl glutaric acid (500 g) and acetic anhydride (326 g). The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours, followed by distilling out the unreacted acetic anhydride at 147°-155° C., and then the distillation was continued under vacuum to ensure removal of traces of unreacted acetic anhydride. The residue was cooled to 25°-30° C. to obtain 445 g of 3-isobutylglutaric anhydride. A 1 l, four-necked flask equipped with a mechanical stirrer The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours by distilling out the unreacted acetic anhydride at 147°-155° C. the distillation removal of traces of unreacted acetic anhydride The residue was cooled to 25°-30° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1 l, four-necked flask equipped with a mechanical stirrer, thermometer pocket and condenser, was charged with 3-isobutyl glutaric acid (500 g) and acetic anhydride (326 g). The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours, followed by distilling out the unreacted acetic anhydride at 147°-155° C., and then the distillation was continued under vacuum to ensure removal of traces of unreacted acetic anhydride. The residue was cooled to 25°-30° C. to obtain 445 g of 3-isobutylglutaric anhydride. A 1 l, four-necked flask equipped with a mechanical stirrer The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours by distilling out the unreacted acetic anhydride at 147°-155° C. the distillation removal of traces of unreacted acetic anhydride The residue was cooled to 25°-30° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In another embodiment, the invention encompasses a process for recycling 3-isobutyl glutaric anhydride comprising: preparing a compound of formula 24 from 3-isobutyl glutaric anhydride by the process according to claim 29; crystallizing the recovered compound of formula 24 from an organic solvent; removing the crystals from the organic solvent; combining the remaining organic solvent with an acid to obtain a first mixture; maintaining the first mixture at a temperature of about 60° C. to about 130° C., to obtain 3-isobutyl glutaric acid; combining the 3-isobutyl glutaric acid with acetic anhydride to obtain a second mixture; heating the second mixture to a temperature of about 125° C. to about 145° C. to obtain 3-isobutyl glutaric anhydride; and recovering the 3-isobutyl glutaric anhydride from the second mixture. to obtain a second mixture heating the second mixture to a temperature of about 125° C. to about 145° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In another embodiment, the invention encompasses a process for recycling 3-isobutyl glutaric anhydride comprising: preparing a compound of formula 24 from 3-isobutyl glutaric anhydride by the process according to claim 29; crystallizing the recovered compound of formula 24 from an organic solvent; removing the crystals from the organic solvent; combining the remaining organic solvent with an acid to obtain a first mixture; maintaining the first mixture at a temperature of about 60° C. to about 130° C., to obtain 3-isobutyl glutaric acid; combining the 3-isobutyl glutaric acid with acetic anhydride to obtain a second mixture; heating the second mixture to a temperature of about 125° C. to about 145° C. to obtain 3-isobutyl glutaric anhydride; and recovering the 3-isobutyl glutaric anhydride from the second mixture. to obtain a second mixture heating the second mixture to a temperature of about 125° C. to about 145° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1 1, four-necked flask equipped with a mechanical stirrer, thermometer pocket and condenser, was charged with 3-isobutyl glutaric acid (500 g) and acetic anhydride (326 g). The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours, followed by distilling out the unreacted acetic anhydride at 147°-155° C., and then the distillation was continued under vacuum to ensure removal of traces of unreacted acetic anhydride. The residue was cooled to 25°-30° C. to obtain 445 g of 3-isobutylglutaric anhydride. A 1 1, four-necked flask equipped with a mechanical stirrer The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours by distilling out the unreacted acetic anhydride at 147°-155° C. the distillation removal of traces of unreacted acetic anhydride The residue was cooled to 25°-30° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In another embodiment, the invention encompasses a process for recycling 3-isobutyl glutaric anhydride comprising: preparing a compound of formula 24 from 3-isobutyl glutaric anhydride by the process according to claim 29; crystallizing the recovered compound of formula 24 from an organic solvent; removing the crystals from the organic solvent; combining the remaining organic solvent with an acid to obtain a first mixture; maintaining the first mixture at a temperature of about 60° C. to about 130° C., to obtain 3-isobutyl glutaric acid; combining the 3-isobutyl glutaric acid with acetic anhydride to obtain a second mixture; heating the second mixture to a temperature of about 125° C. to about 145° C. to obtain 3-isobutyl glutaric anhydride; and recovering the 3-isobutyl glutaric anhydride from the second mixture. to obtain a second mixture heating the second mixture to a temperature of about 125° C. to about 145° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1 l, four-necked flask equipped with a mechanical stirrer, thermometer pocket and condenser, was charged with 3-isobutyl glutaric acid (500 g) and acetic anhydride (326 g). The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours, followed by distilling out the unreacted acetic anhydride at 147°-155° C., and then the distillation was continued under vacuum to ensure removal of traces of unreacted acetic anhydride. The residue was cooled to 25°-30° C. to obtain 445 g of 3-isobutylglutaric anhydride. A 1 l, four-necked flask equipped with a mechanical stirrer The reaction mixture was refluxed at 135°-1450° C. for 2.5-3 hours by distilling out the unreacted acetic anhydride at 147°-155° C. the distillation removal of traces of unreacted acetic anhydride The residue was cooled to 25°-30° C.