Benzene → 2-Methylbuta-1,3-diene;styrene

HRID 328321Notes

Reaction equation

HRID 328321 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]=1

Participants

7

Reactant 4

HCID 241BenzeneHCID 6557IsopreneHCID 7501StyreneHCID 178418400CID 53628100

Product 1

HCID 1599892-Methylbuta-1,3-diene;styrene

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

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

  1. additionby adding 0.42 ml
  2. customat room temperature
  3. customto polymerize for 2 hours
  4. 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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