Isoprene → HCID 86736032, compound

HRID 263155Notes

Reaction equation

HRID 263155 reaction equation
[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[CH:6]([Li])([CH2:8][CH3:9])[CH3:7]>C1CCCCC1>[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:5].[CH2:9]=[CH:8][C:6]1[CH:7]=[CH:4][CH:3]=[CH:2][CH:1]=1.[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:5]

Participants

4

Reactant 2

HCID 6557IsopreneHCID 178418400CID 53628100

Product 1

HCID 86736032HCID 86736032, compound

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

A living poly(isoprene/styrene/isoprene) three block copolymer was prepared by polymerizing isoprene (151.3 g) in cyclohexane (1362 g) solution. Polymerization was initiated by the addition of 79.5 ml of a 95 mmole/liter solution of secondary butyllithium. The reaction was continued for 2.5 hours at 50° C. The living polyisoprene (number average molecular weight 25,600) solution formed was then reacted with styrene (37.9 g) and the reaction was continued for a further 2.5 hours at 50° C. The living poly(isoprene/styrene) block copolymer (number average molecular weight 31,200) solution formed was then reacted with a further amount of isoprene (151.3 g) and the reaction was continued for a further 2.5 hours at 50° C. The number average molecular weight of the living poly(isoprene/styrene/isoprene) block copolymer was 54,400.

Workup

  1. customPolymerization

Sources & evidence

ORD record
ord-5e2a734b130f4b8c9de65673851dcfe4
Source dataset
uspto-grants-1979_05
Patent number
US04156673

Reaction notes

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