2,3-Diphenyl-2,3-butanediol → 2,3-Diphenylbuta-1,3-diene
Reaction equation
[C:1]1([C:7](O)([C:9]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)(O)[CH3:10])[CH3:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.OS([O-])(=O)=O.[K+]>>[C:1]1([C:7]([C:9]([C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=2)=[CH2:10])=[CH2:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1Participants
3
Procedure
A mixture of 50 parts of 2,3-diphenyl-2,3-dihydroxybutane and 0.5 part of freshly dehydrated KHSO4 is distilled for 50 minutes at 11 Torr and 200° C. bath temperature. The fraction which is collected within the boiling range of 150°-180° C./11 Torr yields 43.8 parts of crude 2,3-diphenyl-1,3-butadiene. The product is stirred direct with 21.5 parts of acrylic acid and 2 parts of hydroquinone under a nitrogen atmosphere for 3 hours at 130° to 140° C.
Workup
- distillationis distilled for 50 minutes at 11 Torr and 200° C. bath temperature
- customThe fraction which is collected within the boiling range of 150°-180° C./11 Torr