Isoprene → Styrene

HRID 489122Notes

Reaction equation

HRID 489122 reaction equation
C([Li])(CC)C.CN(CCN(C)C)C.[CH2:14]=[CH:15][C:16](=[CH2:18])[CH3:17].[CH2:19]=[CH:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1>C1CCCCC1>[CH2:19]=[CH:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.[CH2:19]=[CH:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.[CH2:14]=[CH:15][C:16](=[CH2:17])[CH3:18].[CH2:19]=[CH:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

Participants

7

Reactant 4

HCID 6557IsopreneHCID 7501StyreneHCID 8037N,N,N',N'-TetramethylethylenediamineHCID 178418400CID 53628100

Product 2

HCID 7501StyreneHCID 19842620HCID 19842620, compound

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

In a pressure vessel where dry nitrogen had been substituted, styrene was polymerized at 60° C. in cyclohexane as a solvent in the presence of s-butyllithium as a polymerization initiator, and then TMEDA was added as a Lewis base. Then, isoprene and styrene were consecutively polymerized to give a styrene-isoprene-styrene block copolymer. The thus-obtained block copolymer was hydrogenated in cyclohexane in the presence of Pd/C as a catalyst under a 2 MPa hydrogen atmosphere, to give a hydrogenated block copolymer (the hydrogenated block copolymer obtained in Referential Example 2 will be abbreviated as “Copolymer No. 1” hereinafter). Table 3 shows a styrene content, a number average molecular weight, a vinyl bond content and a hydrogenation ratio of the obtained Copolymer No. 1.

Workup

  1. customIn a pressure vessel where dry nitrogen had been substituted

Sources & evidence

ORD record
ord-e7f8d6354c674b08a7acfba0ec169268
Source dataset
uspto-grants-2005_12
Patent number
US06977105B1

Reaction notes

Loading…