1-(1-Isocyanato-1-methylethyl)-3-(1-methylethenyl)benzene → Alpha-Methylstyrene
Reaction equation
[C:1]([C:4]1[CH:5]=[C:6]([CH:13]=[CH:14][CH:15]=1)C(N=C=O)(C)C)([CH3:3])=[CH2:2].C(OC1(C)CCCCC1(C)C)(=O)C(C)=C>>[CH3:3][C:1]([C:4]1[CH:5]=[CH:6][CH:13]=[CH:14][CH:15]=1)=[CH2:2]Participants
3
Procedure
56.52 g (32.0 m moles) of the aminopropyl-capped PDMS of Example 1 are placed in a 100 mL 3-neck round bottom flask fitted with a mechanical stirrer, gas inlet tube and thermometer. The diamine is cooled with an ice-water bath and kept under a dry air atmosphere. 12.90 g (64.1 m moles) of m-isopropenyl-α,α-dimethylbenzyl isocyanate (TMI) are added while stirring. After 2 hours the mixture becomes very thick and 69.42 g of trimethylcyclohexyl methacrylate (TMMA) are added. The ice-water bath is removed and the contents are stirred for an additional 4 hours to yield a 66.1% solution of α-methylstyrene capped poly(dimethylsiloxane) in TMMA.
Workup
- customare placed in a 100 mL 3-neck round bottom flask