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A mixture of 208 g of 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one, 2 l of ethanol, 200 g of sodium hydroxide and 300 g of zinc powder is heated to boiling under reflux while stirring for 2 hours. The still warm mixture is filtered over kieselguhr while back-washing with about 1 l of methanol. After concentration of the yellow solution to about 1 l, the thick paste obtained is partitioned between 2 l of chloroform and 1 l of water. The alkaline-aqueous phase is adjusted to pH 3 to 4 with about 400 ml of concentrated hydrochloric acid while cooling with ice and extracted with 1 l of chloroform. The combined chloroform extracts are washed with water until they are neutral and subsequently dried over magnesium sulfate in the presence of a small amount of active carbon. After filtration and concentration of the clear, light yellowish solution, there is obtained 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ol as an almost white, crystalline mass with a melting point of 89-91°.

1. temperatureis heated
2. temperatureunder reflux
3. filtrationThe still warm mixture is filtered over kieselguhr
4. washwhile back-washing with about 1 l of methanol
5. customAfter concentration of the yellow solution to about 1 l, the thick paste obtained
6. customis partitioned between 2 l of chloroform and 1 l of water
7. temperaturewhile cooling with ice
8. extractionextracted with 1 l of chloroform
9. washThe combined chloroform extracts are washed with water until they
10. dry with materialsubsequently dried over magnesium sulfate in the presence of a small amount of active carbon
11. filtrationAfter filtration and concentration of the clear, light yellowish solution