Benzene → 2-Methylbuta-1,3-diene;styrene
Reaction equation
C([Li])(CC)C.[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.C1C=CC=CC=1.C=CC(=C)C>CO.O1CCCC1>[CH2:6]=[CH:7][C:8](=[CH2:9])[CH3:13].[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1Participants
7
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Procedure
An AB block polymer of styrene-isoprene was prepared by adding 0.42 ml. of 1.18 N sec-butyl lithium to a mixture of 10 g. styrene of 175 ml. of benzene and 5 ml. of tetrahydrofuran at room temperature. The mixture was allowed to polymerize for 2 hours and 40 g. of dry air-free isoprene was added and the polymerization continued for 2 additional hours. The product was isolated by precipitation into methanol, yielding 27.5 g. of block polymer dispersant.
Workup
- additionby adding 0.42 ml
- customat room temperature
- customto polymerize for 2 hours
- customyielding 27.5 g
Sources & evidence
- ORD record
- ord-1d5b085b08a94e0a9c8ead41550eb4ff
- Source dataset
- uspto-grants-1977_04
- Patent number
- US04017476
Reaction notes
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