Reacción #1691911

Ecuación de reacción

phthalic anhydride

2,2,4-trimethyl-1,3-pentanediol

→

7-Isopropyl-8,8-dimethyl-8,9-dihydro-7H-6,10-dioxabenzocyclononene-5,11-dione

Rendimiento 58.0%

Disolventes

xylene

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroXylene was removed on a rotary evaporator at 20 torr, at a base temperature of 68° C
2. 2
   workup.ADDITIONThe residue (30.0 g) was diluted with 30 mL of methanol
3. 3
   Filtraciónfiltered
4. 4
   Lavadowashed with methanol which
5. 5
   Temperaturahad been chilled to -20° C.

Procedimiento

A solution of 114.82 g (0.10 mole) of phthalic anhydride and 16.31 g (0.11 mole) of 2,2,4-trimethyl-1,3-pentanediol (TMPD) in 250 mL of xylene was heated for 96 hr as described in Examples 1-3. Xylene was removed on a rotary evaporator at 20 torr, at a base temperature of 68° C. The residue (30.0 g) was diluted with 30 mL of methanol and the resulting slurry cooled to 1° C., filtered, and washed with methanol which had been chilled to -20° C. to give 15.9 g (58% yield) of 7-Isopropyl-8,8-dimethyl-8,9-dihydro-7H-6,10-dioxabenzocyclononene-5,11-dione, which was 99.9% pure by vapor phase chromatography (vpc). The methanol washing from recovery of 7-Isopropyl-8,8-dimethyl-8,9-dihydro-7H-6,10-dioxabenzocyclononene-5,11-dione contained, on a methanol-free basis, 16.4% of 7-Isopropyl-8,8-dimethyl-8,9-dihydro-7H-6,10-dioxabenzocyclononene-5,11-dione, while the residue from stripping xylene from the original reaction mixture contained 41.2% of 7-Isopropyl-8,8-dimethyl-8,9-dihydro-7H-6,10-dioxabenzocyclononene-5,11-dione.

Fuente