Patent · US Expired

6-Methyl-2H-1,3-oxazin-2,4(3H)dione-3-sulfohalides

US4009161A · kind A · utility

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1References

3Claims

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Assignee

Hoechst GmbH · DE

Inventors

Hartmut Pietsch · Bad Homburg vor der Höhe, DE
Karl Clauss · Hofheim, DE
Erwin Schmidt · Baltmannsweiler, DE
Harald Jensen

Key dates

Filing date	Jul 16, 1975
Grant date	Feb 22, 1977
Priority date	—
Expiry date	Jul 16, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D265/06
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

3-Sulfohalides of 6-methyl-2H-1,3-oxazin-2,4(3H)-dione of the formula I ##STR1## in which X represents fluorine or chlorine are prepared by reacting fluorosulfonyl isocyanate or chlorosulfonyl isocyanate, at a temperature of from -35.degree. to +70.degree. C, optionally in the presence of an inert solvent, with diketene, acetoacetyl fluoride, acetoacetyl chloride, acetoacetic acid or an isopropenyl ester of the formula CH.sub.2 =C(OOCR)-CH.sub.3 in which R represents an alkyl radical having from 1 to 4 carbon atoms, a substituted or unsubstituted phenyl or benzyl radical.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.