The present invention relates to compounds which are suitable as synthesis precursors for the production of electronically active materials for use in organic electroluminescence devices.

The present invention relates to compounds which are suitable as synthesis precursors for the production of electronically active materials for use in organic electroluminescence devices.

The present invention relates to one pot process for the preparation of 2,3-dihydroxy benzonitrile from 2,3-dialkoxy benzoic acid without prior isolation of the intermediates. Further the invention relates to the preparation of 2,3-dihydroxy benzonitrile by dealkylation of 2,3-dialkoxy benzonitrile using suitable aluminum salt-amine complex.

The present invention relates to one pot process for the preparation of 2,3-dihydroxy benzonitrile from 2,3-dialkoxy benzoic acid without prior isolation of the intermediates. Further the invention relates to the preparation of 2,3-dihydroxy benzonitrile by dealkylation of 2,3-dialkoxy benzonitrile using suitable aluminum salt-amine complex.

The present invention relates to one pot process for the preparation of 2,3-dihydroxy benzonitrile from 2,3-dialkoxy benzoic acid without prior isolation of the intermediates. Further the invention relates to the preparation of 2,3-dihydroxy benzonitrile by dealkylation of 2,3-dialkoxy benzonitrile using suitable aluminum salt-amine complex.

The present invention relates to the preparation of cyantraniliprole, comprising the preparation of 8-methyl-2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine-6-carbonitrile key intermediate via 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid. Wherein hydroxylamine attacks a benzylic formyl group, to obtain the 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid, that undergoes simultaneously or by consecutive steps dehydrogenation and cyclization to obtain the benzo[d][1,3]oxazine group and the cyano group of the desired product. In addition, an improved method for the synthesis of the benzylic formyl group is also displayed.

The present invention relates to the preparation of cyantraniliprole, comprising the preparation of 8-methyl-2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine-6-carbonitrile key intermediate via 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid. Wherein hydroxylamine attacks a benzylic formyl group, to obtain the 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid, that undergoes simultaneously or by consecutive steps dehydrogenation and cyclization to obtain the benzo[d][1,3]oxazine group and the cyano group of the desired product. In addition, an improved method for the synthesis of the benzylic formyl group is also displayed.

The present invention relates to the preparation of cyantraniliprole, comprising the preparation of 8-methyl-2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine-6-carbonitrile key intermediate via 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid. Wherein hydroxylamine attacks a benzylic formyl group, to obtain the 2-amino-5-((hydroxyimino)methyl)-3-methylbenzoic acid, that undergoes simultaneously or by consecutive steps dehydrogenation and cyclization to obtain the benzo[d][1,3]oxazine group and the cyano group of the desired product. In addition, an improved method for the synthesis of the benzylic formyl group is also displayed.

The present disclosure provides a method of preparing heptafluoroisobutyronitrile by a gas-phase catalysis. The method includes removing one water molecule from heptafluoroisobutyramide gas to obtain heptafluoroisobutyronitrile by a catalyst. The catalyst includes an oxide of a siderophile element, and the siderophile element includes a moderately siderophile element or a highly siderophile element. The moderately siderophile element is selected from the group consisting of tungsten, molybdenum, tin, gallium, and any combination thereof, and the highly siderophile element is selected from the group consisting of osmium, iridium, ruthenium, rhenium, titanium, and any combination thereof. In the present disclosure, the catalyst is utilized for catalytic dehydration, a cost is low, a water waste, a gas waste and a solid waste are less, a gas-phase continuous reaction can be achieved, and the method is suitable for industrial production. Furthermore, the catalyst has a high catalytic activity and a long catalytic life.

The present disclosure provides a method of preparing heptafluoroisobutyronitrile by a gas-phase catalysis. The method includes removing one water molecule from heptafluoroisobutyramide gas to obtain heptafluoroisobutyronitrile by a catalyst. The catalyst includes an oxide of a siderophile element, and the siderophile element includes a moderately siderophile element or a highly siderophile element. The moderately siderophile element is selected from the group consisting of tungsten, molybdenum, tin, gallium, and any combination thereof, and the highly siderophile element is selected from the group consisting of osmium, iridium, ruthenium, rhenium, titanium, and any combination thereof. In the present disclosure, the catalyst is utilized for catalytic dehydration, a cost is low, a water waste, a gas waste and a solid waste are less, a gas-phase continuous reaction can be achieved, and the method is suitable for industrial production. Furthermore, the catalyst has a high catalytic activity and a long catalytic life.