تفاعل #1222

معادلة التفاعل

ester

ethyl 2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-anthryl)-4-thiophenecarboxylate

sodium hydroxide

→

2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-anthryl)-4-thiophenecarboxylic acid

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe mixture was heated
2. 2
   درجة الحرارةat reflux for one hour
3. 3
   أخرىThe reaction medium was evaporated to dryness
4. 4
   ترشيحthe solids filtered
5. 5
   أخرىThe product obtained
6. 6
   أخرىwas recrystallized from an ethyl alcohol/water mixture and 4.5 g (77%) of the expected acid of melting point 223°-225° C.
7. 7
   أخرىwere recovered

الإجراء التجريبي

6.3 g (16 mmol) of the ester prepared in Example 1 and 100 ml of a 2N methanolic sodium hydroxide solution were introduced into a round-bottomed flask and the mixture was heated at reflux for one hour. The reaction medium was evaporated to dryness, the residue taken up in water, acidified to pH 1 with concentrated hydrochloric acid and the solids filtered. The product obtained was recrystallized from an ethyl alcohol/water mixture and 4.5 g (77%) of the expected acid of melting point 223°-225° C. were recovered.

المصدر