Title:
PROCESS FOR PRODUCING N-HALOGENATED ORGANIC COMPOUNDS
Document Type and Number:
WIPO Patent Application WO2001053270
Kind Code:
A3
Abstract:
The process enables highly effective N-halogenation of a compound having one or more halogenatable amido or imido functional groups in the molecule. The process involves, for example, concurrently feeding into a reactor (i) water, inorganic base, and the compound to be N-halogenated, e.g., a hydantoin, and a feed of (ii) a brominating agent and/or a chlorinating agent. The proportions of these feeds are such that the pH is kept within the range of ca. 5.5-8.5 (preferably 6.5-8.5, and most preferably 6.8-7.2) and one or more of the amido or imido nitrogen atoms is substituted by a bromine or chlorine atom. A feature of the processs is that it can be conducted at elevated temperatures as high as about 90 DEG C without appreciable thermal decomposition of reactants or product. The resultant product continuously precipitates in high yield and purity. Moreover, products can be produced that are very pale yellow to almost pure white in appearance. Further, the process has been found capable of producing 1,3-dibromo-5,5-dimethylhydantoin with far larger particle sizes than previously produced on a commercial basis.
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| JPS5463083 | ORGANISM ACTIVE NITROGEN COMPOUND |
| JPH0776210 | [Title of Invention] Hydroxamic Acid Derivative |
Inventors:
ELNAGAR HASSAN Y
PETERS BRUCE C
SPIELMAN EDGAR E JR
THOMAS DUSTIN H
PETERS BRUCE C
SPIELMAN EDGAR E JR
THOMAS DUSTIN H
Application Number:
PCT/US2001/001544
Publication Date:
February 14, 2002
Filing Date:
January 17, 2001
Export Citation:
Assignee:
ALBEMARLE CORP (US)
International Classes:
C07D233/74; C07D233/82; C07D233/72; (IPC1-7): C07D233/82; C07D251/36
Domestic Patent References:
| WO1997043264A1 | 1997-11-20 |
Foreign References:
| US4532330A | 1985-07-30 | |||
| EP0177645A1 | 1986-04-16 | |||
| US4745189A | 1988-05-17 |
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