Styrene → Isoprene

HRID 1076819Notes

Reaction equation

HRID 1076819 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=CC=C[CH:4]=1.C([Li])(CC)C.[CH:14]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1C=C)=[CH2:15]>>[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:8].[CH2:15]=[CH:14][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

5

Reactant 3

HCID 7501StyreneHCID 666661,2-DiethenylbenzeneHCID 178418400CID 53628100

Product 2

HCID 6557IsopreneHCID 7501Styrene

Procedure

The polymerization was continued for 30 minutes at 70°C. Upon addition of styrene, it appeared that the reaction product of the secondary butyl lithium and divinyl benzen separated out in gel-form and did not go into solution. With the aid of the initiator gelated in this way an A-B-(A)n block copolymer was obtained by successive polymerization isoprene (50 ml) and styrene (10 ml). The properties of the resulting block copolymer are given below:

Workup

  1. customseparated out in gel-form

Sources & evidence

ORD record
ord-4f1ab892790043a5999abd58dd6dfad7
Source dataset
uspto-grants-1976_05
Patent number
US03957913

Reaction notes

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