Montedison S.p.a.

Vittorio Carletti

Stefano Campolmi

Marcello Marchi

Roberto Santi

Maria G Felicioli

Renato Ugo

There is disclosed a process for the preparation of thiocarbamates having the following general formula: ##STR1## wherein: R represents alkyl C.sub.1 -C.sub.4 optionally substituted with one or more halogen atoms, alkenyl C.sub.2 -C.sub.4 optionally substituted with one or more halogen atoms, phenyl optionally substituted with one or more halogen atoms, benzyl optionally substituted with one or more halogen atoms on the phenyl ring;

Process for the preparation of thiocarbamates

The mono-methallyl ether of pyrocatechin of formula (I): ##STR1## is prepared by reacting pyrocatechin of formula (II): ##STR2## with a methallyl halide of formula (III): ##STR3## in a homogeneous dissolving medium, e.g., alcohols, aliphatic polyalcohols and monoethers thereof, or water, in the presence of an organic or inorganic base. The mono-methallyl ether of pyrocatechin is used as an intermediate for organic syntheses and, in particular for synthesizing the product of formula (IV); ##STR4## which is marketed under the tradename 'Carbofuran' and is a compound which is the active principle in soil insecticides of different overall compositions which are available on the market.

Process for preparing the mono-methallyl ether of pyrocatechin

A process is disclosed for preparing N-methylcarbamate of methylthioacetaldoxime, characterized in that an aqueous suspension of methylthioacetaldoxime is additioned, in one step only, with gaseous phosgene and aqueous methylamine in the presence of an inorganic alkaline base substantially at room temperature and pressure. The product obtained, known commercially as 'Methomyl', is an important active principle in the field of insecticides.

Process for preparing N-methylcarbamate of methylthioacetaldoxime

There is disclosed an improved process for selectively preparing 2-(6'-methoxy-2'-naphthyl)-propionic acid in the active antipode (+) form by reacting 2-acetyl-6-methoxynaphthalene, in an organic solvent, with a system consisting of

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Meda, Italy

Vittorio Carletti