Hexane → 2-Methylbuta-1,3-diene;styrene

HRID 1779528Notes

Reaction equation

HRID 1779528 reaction equation
[CH2:1]([Li])[CH2:2][CH2:3][CH3:4].[CH3:6][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11]>>[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:6].[CH2:6]=[CH:7][C:8]1[CH:2]=[CH:1][CH:11]=[CH:10][CH:9]=1

Participants

3

Reactant 2

HCID 8058HexaneHCID 178418339Butyllithium

Product 1

HCID 1599892-Methylbuta-1,3-diene;styrene

Conditions

Temperature
58 °C

Procedure

The resulting mixture is then heated up to a temperature of 45° C. and to it 0.046 g of n-butyl lithium in n-hexane is added. After a 20-minute reaction, the temperature is increased up to 58° C. A sample is collected in order to verify that isoprene has undergone complete conversion, and then 17 g of styrene is added and the reaction is allowed to proceed during a further 20 minutes, until the second monomer has undergone complete conversion too. The temperature of the end mixture results to be of approximately 63° C. In that way, a living diblock isoprene-styrene polymer (I--S) is obtained. In the third reaction step isoprene is added in an amount of 74 g, with the living triblock copolymer of (I1 --S--I2) type being obtained which is submitted to coupling with monobromoethane.

Workup

  1. additionis added
  2. customAfter a 20-minute reaction
  3. customA sample is collected in order
  4. addition17 g of styrene is added
  5. customThe temperature of the end mixture results
  6. customto be of approximately 63° C

Sources & evidence

ORD record
ord-4317ede3bfe8424d9e15f28c7269a48d
Source dataset
uspto-grants-1997_05
Patent number
US05627234

Reaction notes

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