Method for preparing a salt of 4-hydroxystyrene and for preparing 4-tertiary-butoxycarbonyloxystyrene therefrom
US5256809A · kind A · utility
2Cited by
3References
18Claims
0Family size
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Key dates
| Filing date | Sep 3, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Sep 3, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/64
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4-Acetoxystyrene is reacted with a base in a solvent to form a salt of 4-hydroxystyrene via saponification. Alternatively, 4-hydroxystyrene is reacted with a base to form a salt of 4-hydroxystyrene. In the latter case, the 4-hydroxystyrene is prepared by the transesterification of 4-acetoxystyrene. Subsequently or simultaneously, the salt of 4-hydroxystyrene is reacted, preferably in situ. with di-tertiary-butyl-dicarbonate to form 4-tertiary-butoxycarbonyloxystyrene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.