Isoprene → HCID 19842620, compound

HRID 1075742Notes

Reaction equation

HRID 1075742 reaction equation
[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[CH:6]([Li])([CH2:8][CH3:9])[CH3:7]>C=CC1C=CC=CC=1>[CH2:1]=[CH:2][C:3]1[CH:4]=[CH:8][CH:6]=[CH:7][CH:5]=1.[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

Participants

4

Reactant 2

HCID 6557IsopreneHCID 178418400CID 53628100

Product 1

HCID 19842620HCID 19842620, compound

Reagents, catalysts & solvents 1

HCID 7501StyreneSolvent3×

Procedure

To form the second block, 50 ml of isoprene were added to the reaction mixture, whose contaminants had not been deactivated by an excess of initiator, and polymerization was effected at 50°C until all the isoprene had been used up. Subsequently 10 ml of styrene was pretreated with an anionic initiator (secondary butyl lithium), until the colour just turned yellow, and the so treated styrene introduced into the reactor. After all styrene has been polymerized, the reaction product was stabilized and coagulated and worked up in a conventional manner. The styrene-isoprene-styrene block copolymer formed in this way had a number average molecular weight of 36,000 - 136,000 - 36,000 for the blocks A--B--C.

Workup

  1. additionwere added to the reaction mixture, whose contaminants
  2. customexcess of initiator, and polymerization
  3. customwas effected at 50°C until all

Sources & evidence

ORD record
ord-a2aa5df427ad48deba506f0a55b79957
Source dataset
uspto-grants-1976_05
Patent number
US03954696

Reaction notes

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