In an industrial process for preparing organohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains an effective amount of a phosphonium compound having on the molecule at least one group of the formula: [R.sup.2 R.sup.3 R.sup.4 P--].sup.+ Y.sup.- wherein R.sup.2, R.sup.3 and R.sup.4 each are a monovalent hydrocarbon group and Y is a halogen atom or acid group....

Disclosed is a pack comprising a water-soluble polymer and a Saxifrage extract. The pack of the present invention allays irritation and pain on peeling, firms up the skin after use, moisturizes the skin, and has excellent remoisturizing properties, quick-drying properties and facility.

Sulphides are prepared by combining a dithionite compound with an aqueous alkaline solution of an appropriate cation or mixture of cations. On heating the corresponding sulphides are precipitated. The dithionite compound may be a dithionite dianion which is produced as an intermediary when thiourea dioxide is used as a starting material in the solution. Examples of appropriate cations are zinc (as zinc acetate) and copper (as copper acetate). The precipitate is dried and subsequently fired to pr...

The present invention is directed to the novel forms of risperidone, designated Form A, Form B and Form E. Methods for their preparation are also disclosed. The present invention also relates to processes for making risperidone. Pharmaceutical compositions containing the new forms of risperidone and methods of using them are also disclosed.

When oganohalosilanes are prepared by charging a reactor with a contact mass containing metallic silicon and a copper catalyst, and introducing an organohalide-containing gas feed into the reactor, the partial pressure of organohalide gas in the gas feed is manipulated so as to keep the temperature within the reactor substantially constant. The precise control of reactor internal temperature ensures that organohalosilanes with a higher useful silane content are produced in a safe and inexpensive...

Trialkylindium compounds are prepared by reacting indium trihalide with a trialkylaluminum compound in the presence of a fluoride salt, wherein the molar ratio of the indium trihalide to the fluoride salt is at least 1:4.5. Such trialkylindium compounds are particularly suitable for use in metalorganic vapor phase epitaxy.

The present invention is directed to a process or method for preparing a metal fluoride pre-melt material of a quality suitable for the preparation and growth of metal fluoride optical monocrystals. The pre-melt material of the invention is prepared using permeable graphite crucibles having a permeability (porosity) greater than 4 cm.sup.2 /s. Exemplary monocrystals prepared from pre-melts of the invention exhibited improved transmissivity and laser durability relative to monocrystals prepared f...

A process for the preparation of a compound of formula (A) wherein: X is hydrogen, hydroxy, chloro, C.sub.1-6 alkoxy or phenyl C.sub.1-6 alkoxy; and R.sub.a and R.sub.b are hydrogen, or acyl or phosphate derivatives thereof, which process comprises: (i) the preparation of a compound of formula (I) whereiff R.sub.1 is C.sub.1-6 alkyl, or phenyl C.sub.1-6 alkyl in which the phenyl group is optionally substituted; R.sub.2 is hydrogen hydroxy, chlorine, C.sub.1-6 alkoxy, phenyl C.sub.1-6 alkoxy or a...

In an industrial process for preparing organohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains an effective amount of a phosphine chalcogenide compound. The invention drastically increases the silane formation rate and the utilization of silicon without lowering the selectivity of useful silane.

Citalopram and other phthalanes are made by reacting a salt of a compound of formula (II) where R.sup.1 is halogen and R.sup.2 is halogen, trifluoromethyl, cyano or R--CO-- where R is a C.sub.1-4 alkyl group, with cuprous cyanide.