Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

HRID 2295159Notes

Reaction equation

HRID 2295159 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C([Li])(CC)C.C=CC=C>C1CCCCC1>[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

5

Reactant 3

HCID 7501StyreneHCID 78451,3-Butadiene3×HCID 178418400CID 536281002×

Product 1

HCID 62697Benzene, ethenyl-, polymer with 1,3-butadiene

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

A six armed asymmetrical styrene-butadiene blockcopolymer P6 was prepared as in example 1, except that 143 g styrene were added to 6 l cyclohexane at 50° C., after which 4.76mmol sec-butyllithium were added. After the polymerization was completed, 238 g butadiene were dosed to the same reactor. The polymerization continued until completion. Hereafter 1.19 mmol of the coupling reagent BTCSE were added. INT6 was sampled at this stage. The reaction sequence was followed by adding 50 g of butadiene to the reaction and 2.38 mmol sec-butyllithium. Hereafter, 69 g of butadiene were dosed to the reactor.

Workup

  1. aliquotINT6 was sampled at this stage

Sources & evidence

ORD record
ord-d9ab20ead5574053b3dcc05bbfad9b39
Source dataset
uspto-grants-1997_11
Patent number
US05691420

Reaction notes

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