تفاعل #56105

معادلة التفاعل

Thionyl chloride

4-hydroxy-2-butynyl 4-cyano-3,4-diphenylbutyrate

→

title compound

المردود 25.0%

4-Chloro-2-butynyl 4-Cyano-3,4-diphenylbutyrate

المردود 25.0%

المذيبات

pyridine

ether

methylene chloride

ظروف التفاعل

المعالجة

1. 1
   أخرىequipped with a Drierite tube
2. 2
   غسيلwas washed sequentially with 40 ml of hydrochloric acid, 40 ml of saturated aqueous sodium bicarbonate, three 40-ml portions of water and 40 ml of saturated aqueous sodium chloride
3. 3
   تجفيفThe organic phase was dried (MgSO4)
4. 4
   ترشيحfiltered
5. 5
   أخرىpurified by column chromatography on silica gel (hexanes/methylene chloride)

الإجراء التجريبي

Thionyl chloride (3.56 g, 30.0 mmol) was added via syringe over a 5 min period to a stirred solution of 8.00 g (24.0 mmol) of 4-hydroxy-2-butynyl 4-cyano-3,4-diphenylbutyrate in 2.4 ml of pyridine at 0°. The reaction mixture was stirred at room temperature for 2 hours in a flask equipped with a Drierite tube. The mixture was diluted with 40 ml of ether and 100 ml of methylene chloride and was washed sequentially with 40 ml of hydrochloric acid, 40 ml of saturated aqueous sodium bicarbonate, three 40-ml portions of water and 40 ml of saturated aqueous sodium chloride. The organic phase was dried (MgSO4), filtered, stripped and purified by column chromatography on silica gel (hexanes/methylene chloride) to yield 2.11 g (25%) of the title compound. The infrared and nmr spectra are in accord with the assigned structure.

المصدر