An improved method for the synthesis of substantially pure Permethrin having purity greater than 99.5% by Gas Chromatography provided. The embodiments also relates to a purification process of Permethrin by recrystallization from methanol-water mixture.

An improved method for the synthesis of substantially pure Permethrin having purity greater than 99.5% by Gas Chromatography provided. The embodiments also relates to a purification process of Permethrin by recrystallization from methanol-water mixture.

Provided are the crystalline form of tefluthrin of formula (I), the crystal preparation process, the analyses of the crystal through various analytical methods and using the crystal to prepare stable agrochemical formulation. Also provided is the use of various solvents towards the crystalline form preparation conditions.

Provided are the crystalline form of tefluthrin of formula (I), the crystal preparation process, the analyses of the crystal through various analytical methods and using the crystal to prepare stable agrochemical formulation. Also provided is the use of various solvents towards the crystalline form preparation conditions.

Dental material which contains at least one vinylcyclopropane of the general formulae I, ##STR00001##
in which A, B independently of each other are in each case OH or COOH; X, Y independently of each other are in each case O or NH; R.sup.1, R.sup.2 independently of each other are in each case H or an aliphatic linear or branched C.sub.1-C.sub.10 hydrocarbon radical which can be interrupted by O, S or an ester group; and n, m independently of each other are in each case 0, 1 or 2, wherein, if XYO, R.sup.1H and R.sup.2H, n+m1. The vinylcyclopropanes are characterized by a low shrinkage and a high reactivity on radical polymerization and are suitable in particular for the preparation of dental materials.

Dental material which contains at least one vinylcyclopropane of the general formulae I, ##STR00001##
in which A, B independently of each other are in each case OH or COOH; X, Y independently of each other are in each case O or NH; R.sup.1, R.sup.2 independently of each other are in each case H or an aliphatic linear or branched C.sub.1-C.sub.10 hydrocarbon radical which can be interrupted by O, S or an ester group; and n, m independently of each other are in each case 0, 1 or 2, wherein, if XYO, R.sup.1H and R.sup.2H, n+m1. The vinylcyclopropanes are characterized by a low shrinkage and a high reactivity on radical polymerization and are suitable in particular for the preparation of dental materials.

The present invention describes an improved method for the synthesis of substantially pure Permethrin (1) having purity greater than 99.5% by Gas Chromatography (GC). The invention also relates to a purification process of Permethrin by recrystallization from methanol-water mixture.

The present invention describes an improved method for the synthesis of substantially pure Permethrin (1) having purity greater than 99.5% by Gas Chromatography (GC). The invention also relates to a purification process of Permethrin by recrystallization from methanol-water mixture.

This disclosure relates to compositions comprising diruthenium catalysts and uses related thereto. In certain embodiments, the diruthenium catalyst comprises a cyclopropyl ring substituted with a carboxylic acid ligand. In certain embodiments, the diruthenium catalyst comprises an N-(sulfonyl)pyrrolidine ring substituted with a carboxylic acid ligand. In certain embodiments, the diruthenium catalyst comprises a 2-(1,3-dioxoisoindolin-2-yl)acetic acid ligand. In certain embodiments, this disclosure relates to methods of using catalysts in chemical transformations disclosed herein.

This disclosure relates to compositions comprising diruthenium catalysts and uses related thereto. In certain embodiments, the diruthenium catalyst comprises a cyclopropyl ring substituted with a carboxylic acid ligand. In certain embodiments, the diruthenium catalyst comprises an N-(sulfonyl)pyrrolidine ring substituted with a carboxylic acid ligand. In certain embodiments, the diruthenium catalyst comprises a 2-(1,3-dioxoisoindolin-2-yl)acetic acid ligand. In certain embodiments, this disclosure relates to methods of using catalysts in chemical transformations disclosed herein.