Basf Aktiengesellschaft

Siegfried Kersten

Karl-Heinz Koenig

Gernot Reissenweber

Gerhard Hamprecht

Wolfgang Rohr

Christoph Kuenast

Peter Hofmeister

August Wigger

Wolfgang Seppelt

Albrecht Mueller

Hans-Gert Recker

Christian Reitel

Peter Jacobs

Walter Ditter

Karl-Friedrich Jaeger

Linhard Sproesser

Josef B Pawliczek

Detlef Doehnert

A compound of the chemical formula (I) ##STR1## in a specific crystalline form, processes for its preparation, and its use for pest control.

Crystalline form and its preparation

O-(O-ethyl-S-alkylphosphoryl)-O-(carbamoyl)-pyrocatechol derivatives of the formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, R.sup.2 is hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, R.sup.3 is hydrogen or C.sub.1 -C.sub.4 -alkyl, and X is oxygen or sulfur, and methods of combating pests with effective amounts of I.

O-(O-ethyl-S-alkylphosphoryl)-O-(carbamyl)-pyrocatechol derivatives

O-(1-Methoxy-2-chloro)ethoxyphenyl N-methylcarbamate is prepared by reacting pyrocatechol carbonate with methylamine and then reacting the resulting pyrocatechol monomethylcarbamate with 1,2-dichloroethyl methyl ether in the presence of a secondary amine.

Preparation of o-(1-methoxy-2-chloro)-ethoxyphenyl N-methylcarbamate

Pyrocatechol methylcarbamate is prepared by reacting pyrocatechol carbonate with methylamine in the presence of a tertiary amine and, preferably, a solvent.

Preparation of pyrocatechol methylcarbamate

New sulfamic acid halides and a process for the manufacture of sulfamic acid halides by reacting sulfamic acids with aldehydes and acid halides. The products are starting materials for the manufacture of crop protection agents, dyes and pharmaceuticals.

Vinyl-substituted sulfamic acid halides

Aliphatic isocyanates are produced by thermal decomposition of the corresponding .beta.-naphthyl carbamates.

Manufacture of aliphatic isocyanates

Growing community of inventors

Frankenthal, Germany

Siegfried Kersten