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

HRID 2295158Notes

Reaction equation

HRID 2295158 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-Butadiene2×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 P4 was prepared as in example 1, except that 72 g styrene were added to 6 l cyclohexane at 50° C., after which 7.25 mol sec-butyllithium were added. After the polymerization was completed, 362 g butadiene were dosed to the same reactor. The polymerization continued until completion. Hereafter 1.81 mmol of the coupling reagent BTCSE was added. INT4 was sampled at this stage. The reaction sequence was followed by adding 65 g of butadiene to the reaction and 3.62 mol sec-butyllithium.

Workup

  1. aliquotINT4 was sampled at this stage

Sources & evidence

ORD record
ord-0318f03d4c444baa821a9741bb9ee2dd
Source dataset
uspto-grants-1997_11
Patent number
US05691420

Reaction notes

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