تفاعل #55612

معادلة التفاعل

hydrochloric acid

potassium hydroxide

methyl 4-androsten-3-one-17β-carboxylate

water

→

4-androsten-3-one-17β-carboxylic acid

المردود 98.0%

المذيبات

methanol

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe reaction mixture was refluxed under nitrogen for 6 hours
2. 2
   أخرىMost of the product crystallized as fine crystals
3. 3
   workup.ADDITIONof water was added in a stream over 30 minutes
4. 4
   أخرىwhich precipitated all of the product
5. 5
   ترشيحThe mixture was filtered on a cap funnel
6. 6
   غسيلwashed with water until the wash water showed neutral
7. 7
   أخرىThe product was dried in an oven at 50° C. overnight
8. 8
   أخرىwas obtained in 98% yield (2.313 g.)

الإجراء التجريبي

To 2.462 kg. of methyl 4-androsten-3-one-17β-carboxylate in 24.6 l of methanol was added 1.23 kg. of potassium hydroxide in 4.9 l. of water. The reaction mixture was refluxed under nitrogen for 6 hours, and then allowed to cool to room temperature overnight. The mixture was acidified with 3200 ml. of 6 N hydrochloric acid. Most of the product crystallized as fine crystals. Then, 14 l. of water was added in a stream over 30 minutes, which precipitated all of the product. The mixture was aged with stirring for 4 hours at 30° C. The mixture was filtered on a cap funnel and washed with water until the wash water showed neutral. The product was dried in an oven at 50° C. overnight. The product, having a m.p. of 245°-248° C., was obtained in 98% yield (2.313 g.).

المصدر