Isoprene → HCID 19842620, compound

HRID 393299Notes

Reaction equation

HRID 393299 reaction equation
[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[CH2:6]1[CH2:11][CH2:10][CH2:9][CH2:8][CH2:7]1.[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>C(O)(C)C>[CH2:12]=[CH:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:5].[CH2:1]=[CH:2][C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1

Participants

5

Reactant 3

HCID 6557IsopreneHCID 7501StyreneHCID 8078Cyclohexane2×

Product 1

HCID 19842620HCID 19842620, compound

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Conditions

Temperature
40 °C

Procedure

A stainless autoclave dried well and flushed with nitrogen was charged with 266 g of styrene and 2,500 g of cyclohexane. After the solution had been heated to 40° C., 3.5 mL of a 1.0 M hexane solution of n-butyllithium was added thereto, it was heated to 50° C. and reacted for 2 hours. 60 g of isoprene was then added as a cyclohexane solution and reacted for a further 2 hours. 266 g of styrene and 700 g of cyclohexane were then added and reacted for a further 2 hours. After the reaction was completed, 0.7 g of isopropanol was added to give a styrene-isoprene-styrene block copolymer. The average molecular weight obtained by GPC was 107,000, and the molecular weight distribution was 1.45.

Workup

  1. customA stainless autoclave dried well
  2. customflushed with nitrogen
  3. additionwas charged with 266 g of styrene and 2,500 g of cyclohexane
  4. addition3.5 mL of a 1.0 M hexane solution of n-butyllithium was added
  5. temperatureit was heated to 50° C.
  6. customreacted for 2 hours
  7. customreacted for a further 2 hours
  8. customreacted for a further 2 hours

Sources & evidence

ORD record
ord-80eaad69f2b94b82a84f6aac2dcb7c21
Source dataset
uspto-grants-2004_10
Patent number
US06806322B2

Reaction notes

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