2,4,4-Trimethyl-1-pentene → 2,4,4-Trimethyl-1-pentene
Reaction equation
[Na].[C:2]([OH:9])(=[O:8])/[CH:3]=[CH:4]\[C:5]([OH:7])=O.[CH3:10][C:11]([CH2:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[CH2:12]>>[C:5]1(=[O:7])[O:9][C:2](=[O:8])[CH:3]=[CH:4]1.[CH3:12][C:11]([CH2:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[CH2:10]Participants
Procedure
Type B is the sodium salt of a copolymer of maleic acid and 2,4,4-trimethylpent-1-ene obtained by hydrolysis of a copolymer of maleic anhydride and 2,4,4-trimethylpent-1-ene. Latter copolymer is obtainable in accordance with Example 3 of EP-A 9169. Instead of isolating the unhydrolyzed copolymer by spray drying as in Example 3 of EP-A 9169, 325 parts of water are added to the suspension and excess diisobutene is distilled off by steam distillation (bath temperature 80° C.). When an internal temperature of 98° C. is reached, steam is passed in for a further 1 h. Following the addition of a further 220 parts of water and 200 parts of 50% strength by weight sodium hydroxide solution, the mixture is stirred at 100° C. until a virtually clear aqueous solution is obtained (about 4 h). The solids content is then adjusted to 25% using water. The pH of the solution is 10. The K value of the copolymer (determined in accordance with Fikentscher as a 1% strength by weight solution in dimethylformamide) is in the range of 30-40.
Sources & evidence
- ORD record
- ord-d811ce68ec264788a85db1dde6d0a557
- Source dataset
- uspto-grants-2004_04
- Patent number
- US06727318B1
Reaction notes
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