تفاعل #828711

معادلة التفاعل

HCl

Hydrogen

borane methyl sulfide

cyclohexene

→

title product

المردود 75.0%

Dicyclohexylchloroborane

المردود 75.0%

المذيبات

ether

diethyl ether

diethyl ether

ظروف التفاعل

المعالجة

1. 1
   أخرىA 500-mL round-bottom flask capped with a rubber septum, a magnetic stirring bar, and a connecting tube
2. 2
   درجة الحرارةThe flask was cooled in an ice bath
3. 3
   أخرىDicyclohexylborane precipitated as a white solid
4. 4
   أخرىThe supernatant liquid was removed by a double-ended needle
5. 5
   غسيلthe solid was washed with ether
6. 6
   أخرىthe liquid was removed
7. 7
   أخرىA clear solution was obtained
8. 8
   workup.DISTILLATIONDistillation

الإجراء التجريبي

A 500-mL round-bottom flask capped with a rubber septum, a magnetic stirring bar, and a connecting tube attached to a mercury bubbler was charged with diethyl ether (150 mL) and cyclohexene (41 mL, 400 mmol). The flask was cooled in an ice bath, borane-methyl sulfide (BMS, 20 mL, 200 mmol) was added slowly, and stirring was continued for 3 h at 0° C. Dicyclohexylborane precipitated as a white solid. The supernatant liquid was removed by a double-ended needle, the solid was washed with ether, and the liquid was removed. Then the solid was suspended in 100 mL of diethyl ether, and anhydrous HCl in ether (66.7 mL of 3M solution, 200 mmol) was added slowly to the suspension at 0° C. Hydrogen is rapidly evolved and should be safely vented. A clear solution was obtained. The 11B NMR analysis of the resulting solution showed formation of Chx2BCl (δ 66 ppm in diethyl ether). Distillation provides the pure title product (δ 76 ppm in hexane), 31.6 g, 75% yield, bp 95°-96 ° C. (0.35 mm).

المصدر