Patent · US Expired

Process for preparing 1-aryl-4-carbamoyl-tetrazolinones

US5877323A · kind A · utility

0Cited by

3References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Reinhard Lantzsch · Leverkusen, DE
Uwe Stelzer · Burscheid, DE
Carl Casser · Neunburg vorm Wald, DE

Key dates

Filing date	Feb 12, 1998
Grant date	Mar 2, 1999
Priority date	—
Expiry date	Feb 12, 2018

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D257/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Herbicidally active 1-aryl-4-carbamoyl-tetrazolinones of the formula (I) ##STR1## in which Ar represents optionally substituted aryl, PA1 R.sup.1 represents in each case optionally substituted alkyl, alkenyl, alkinyl or alkoxy, and PA1 R.sup.2 represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, or, together with R.sup.1, represents alkanediyl, are obtained in good yields and at high purity by reacting 1-aryl-tetrazolinones of the formula (II) with phosgene in the presence of a diluent at temperatures of between 0.degree. C. and 150.degree. C. ("first process step"), and reacting the resulting (novel) 1-aryl-4-chlorocarbonyl-tetrazolinones of the formula (III) with amines of the formula (IV) in the presence of a diluent, and, where appropriate, in the presence of a further basic compound, at temperatures of between -20.degree. C. and +100.degree. C. ("second process step"): ##STR2##

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