HCID 86733047, compound → Isoprene

HRID 1578560Notes

Reaction equation

HRID 1578560 reaction equation
[CH2:1]([Li])[CH2:2][CH2:3][CH3:4].[CH2:6]=[CH:7][C:8](=[CH2:10])[CH3:9].C=CC=C.CCCCCC>[Ni].CCCCCC>[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:6]=[CH:7][C:8](=[CH2:9])[CH3:10]

Participants

6

Reactant 2

HCID 86733047HCID 86733047, compoundHCID 178418339Butyllithium

Product 2

HCID 6557IsopreneHCID 78451,3-Butadiene

Reagents, catalysts & solvents 2

HCID 935NickelCatalystHCID 8058HexaneSolvent

Conditions

Temperature
160 fahrenheit

Procedure

To a 20-gallon reactor forty pounds of hexane and 110.7 ml. of 15% n-butyllithium are charged. Then the temperature of the mixture is raised to 160°F. and metering of a blend of isoprene/butadiene/hexane (20/30/50) is started. Over a 3 hour period total of 45 pounds of the blend is charged with the temperature maintained at 160°F. The polymer obtained by this method is hydrogenated with Ni catalyst to complete hydrogenation level. The resulting polymer does not show properties of a thermoplastic elastomer. Differential thermal analysis shows that the polymer has a Tg of -55°C but no melting point. These results demonstrate that a copolymer obtained by the simultaneous copolymerization of butadiene and isoprene does not have the desirable properties obtained in the multiblock copolymer obtained in Example III.

Workup

  1. additionOver a 3 hour period total of 45 pounds of the blend is charged with the temperature
  2. temperaturemaintained at 160°F
  3. customThe polymer obtained by this method

Sources & evidence

ORD record
ord-b5bc8b8bdeb34346911bde99380786d3
Source dataset
uspto-grants-1976_02
Patent number
US03937760

Reaction notes

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