Réaction #74969

Équation de réaction

1,2,3,4,9,9-hexachloro-1,4,4a,8a-tetrahydro-1,4-methanonaphthalene-5,8-dione

acetic acid

water

→

1,2,3,4,9,9-hexachloro-1,4,4a,6,7,8a-hexahydro-1,4-methanonaphthalene-5,8-dione

Solvants

chloroform

Conditions de réaction

Traitement

1. 1
   workup.STIRRINGstirring
2. 2
   AutreThe chloroform layer was separated
3. 3
   Lavagewashed with a saturated sodium carbonate solution
4. 4
   Séchagedried over anhydrous magnesium sulfate
5. 5
   AutreEvaporation of the chloroform
6. 6
   workup.WAITleft a white solid
7. 7
   AutreOne recrystallization from methanol
8. 8
   Autregave white crystals, m.p. 169°-170° C

Mode opératoire

38 g. of 1,2,3,4,9,9-hexachloro-1,4,4a,8a-tetrahydro-1,4-methanonaphthalene-5,8-dione, prepared as in Example 1, were suspended in 150 ml. of glacial acetic acid and then this mixture was poured into 20 g. of zinc dust suspended in 150 ml. of distilled water. A slight exotherm occurred during stirring and the temperature was maintained at 50° C. for 3 hours by external heating. Then 200 ml. of chloroform were added and stirring was continued for 30 minutes more. The chloroform layer was separated and washed with a saturated sodium carbonate solution and dried over anhydrous magnesium sulfate. Evaporation of the chloroform left a white solid. One recrystallization from methanol gave white crystals, m.p. 169°-170° C. Infrared spectrum showed carbonyl at 1740 cm-1. The nmr indicated two bridgehead protons at 431 Hz (singlet) and four α-protons at 303 Hz and 245 Hz (as a multiplet).

Source