Agents for defoliating cotton

US5171352A · kind A · utility

Inventors

• Klaus Grossmann · Schifferstadt, DE
• Wilhelm Rademacher · Schifferstadt, DE
• Gerhard Hamprecht · Weinheim, DE
• Karl-Otto Westphalen · Speyer, DE
• Bruno Wuerzer · Otterstadt, DE

Key dates

• Filing date: Aug 2, 1990
• Grant date: Dec 15, 1992
• Expiry date: Aug 2, 2010

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01N47/36
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Cotton plants are defoliated by the action of an amount, having a defoliant effect, of a phenylsulfonylurea Ia or Ib ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl or C.sub.3 -C.sub.5 -alkoxyalkyl, and these radicals may each carry from 1 to 3 halogen atoms, or C.sub.3 - or C.sub.4 -alkenyl or C.sub.3 - or C.sub.4 -alkynyl, R.sup.2 is F, Cl or Br, R.sup.2' is H, F, Cl or Br, R.sup.3 is H, CH.sub.3 or C.sub.2 H.sub.5, R.sup.4 is halogen, CH.sub.3 or OCH.sub.3, R.sup.5 is CH.sub.3 or OCH.sub.3, R.sup.6 is halogen, C.sub.1 - or C.sub.2 -alkyl, C.sub.1 - or C.sub.2 -alkoxy, C.sub.1 - or C.sub.2 -alkylthio or C.sub.1 - or C.sub.2 -alkylamino and Z is CH or N, or of an alkali metal or alkaline earth metal salt of a compound Ia or Ib.