Patent · US Expired

Preparation of ammonium salts of 3-isopropyl-2, 1, 3-benzothia-diazin-4-one 2,2-dioxide

US5795983A · kind A · utility

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2References

9Claims

0Family size

Assignee

BASF SE

Inventors

Hans Rupert Merkle · Ludwigshafen, DE
Alfons Durein · Wasserburg am Inn, DE
Hanspeter Hansen
Karl-Friedrich Jager · Schifferstadt, DE

Key dates

Filing date	Aug 15, 1997
Grant date	Aug 18, 1998
Priority date	—
Expiry date	Aug 15, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D285/16
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing salts of 3-isopropyl-2,1,3-benzothia-diazin-4-one 2,2-dioxide of the general formula I ##STR1## (R.sup.1 -R.sup.4 =H, lower alkyl, lower hydroxyalkyl) by reacting bentazone (IIa) with an amine IIIa in an organic solvent, by reacting bentazone (IIa) with an amine IIIa or an ammonium salt IIIb in a virtually water-immiscible organic solvent and taking up the salt I in water or by reacting bentazone (IIa) with an ammonium salt IIIb or bentazone-sodium (IIb) with an ammonium salt IIIc, in each case in water.

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