تفاعل #64260

معادلة التفاعل

1,2-diaminobenzene

diphenylsulfone

toluene

→

product

المردود 64.0%

2-(4-Hydroxyphenyl)benzimidazole

المردود 64.0%

ظروف التفاعل

المعالجة

1. 1
   أخرىThe toluene was removed
2. 2
   درجة الحرارةthe temperature increased to 260° C.
3. 3
   درجة الحرارةmaintained for two and one-half hours
4. 4
   درجة الحرارةthe temperature increased to 290° C.
5. 5
   درجة الحرارةmaintained for one and one-half hours
6. 6
   أخرىThe warm reaction mixture
7. 7
   أخرىwas precipitated in toluene
8. 8
   غسيلwashed in hot toluene
9. 9
   أخرىsubsequently dried at 110° C.
10. 10
    أخرىto afford 45.00 g (92% crude yield) of a red-tan powder, m.p. (DTA) 279° C. (broad)
11. 11
    أخرىThe solid was recrystallized from 40% aqueous ethanol

الإجراء التجريبي

A mixture of 1,2-diaminobenzene (25.17 g, 0.233 mol), phenyl-4-hydroxphenylbenzoate (50.17 g, 0.234 mol), diphenylsulfone (121.15 g), and toluene (100 ml) were heated under a nitrogen atmosphere for 16 hours at 150° C. The toluene was removed and the temperature increased to 260° C. and maintained for two and one-half hours. A vacuum was subsequently applied and the temperature increased to 290° C. and maintained for one and one-half hours. The warm reaction mixture was precipitated in toluene, washed in hot toluene, and subsequently dried at 110° C. to afford 45.00 g (92% crude yield) of a red-tan powder, m.p. (DTA) 279° C. (broad). The solid was recrystallized from 40% aqueous ethanol using charcoal to afford a light tan crystalline product (31.46 g, 64% yield). The compound exhibited a sharp melt by DTA with an endothermic minimum at 280° C. Anal. calcd for C13H10N2O: C, 74.27%; H, 4.79%; N, 13.32%; Found: C, 74.21%; H, 4.75%; N, 13.21%.

المصدر