Organohalosilanes are prepared 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 copper catalyst contains an effective amount of a catalyst alloy containing 0.2 8 wt % of tin and 4 20 wt % of phosphorus which is powdered by atomization.

The present invention discloses a method for preparing cabergoline form I by combining cabergoline and a solvent comprising ethylbenzene to form a solvate and obtaining form I from the solvate. Also disclosed in a method for preparing cabergoline form I by combining cabergoline and a first solvent to form a solution and additionally including a second solvent to the solution, followed by crystallization to form cabergoline form I. Further disclosed is a solvate form of cabergoline comprising cab...

An oral composition comprising 0.5 to 10% by weight of an abrasive precipitated silica having a 50 percentile (d50) of particle diameter being 5 .mu.m or less, a 90 percentile (d90) of particle diameter being 15 .mu.m or less and an RDA value of 120 or more, and 0.01 to 5% by weight of at least one of sulfosuccinate surfactants represented by general formula (1): ##STR00001## [wherein either X.sub.1 or X.sub.2 is R.sub.1O--(AO).sub.n-- or the like and the other is M.sub.2O--; M.sub.1 and M.sub.2...

A process for preparing (R)-5-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carb- onyl]-1H-pyrrol-1-yl]-5-hydroxy-3-oxo-1-heptanoic acid, tert-butylester comprising: (a) reduction of 5-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl- ]-1H-pyrrol-1-yl]-3-oxo-1-pentanoic acid, (R)-2-hydroxy-1,2,2-triphenylethyl ester; (b) hydrolysis of (R)-5-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carb- onyl]-1H-pyrrol-1-yl]-3-hydroxy-1-pentanoic acid...

The invention relates to a process for the synthesis of Aztreonam. Specifically, the process entails hydrolyzing [3S-[3.alpha.(Z),4.beta.]]-3-[[(2-amino-4-thiazolyl)[(1-t-butoxycarbonyl-- 1-methylethoxy)imino]acetyl]amino]-4-methyl-2-oxo-1-azetidinesulfonic acid (t-Bu Aztreonam) to form Aztreonam.

The present invention relates to the preparation of an x-ray photomask by exposing a free-standing film of a radiation sensitive metal/chalcogenide to an electron beam scanned in a defined pattern so as to generate areas in the film of reduced metal content in accordance with the defined pattern, as well as novel x-ray photomasks.

The invention relates to a process for the preparation of an epoxidation catalyst, which process involves impregnating a silicon containing carrier with a gas stream consisting of titanium halide. The invention also relates to a process for the preparation of alkylene oxide using such catalyst.

A process for preparing oxycodone or an oxycodone salt, wherein the oxycodone or oxycodone salt has low levels of impurities (especially 14-hydroxycodeinone) is disclosed. The process comprises the steps of: a) preparing a mixture comprising oxycodone and a solvent and adjusting the pH of the mixture to less than 6; and subsequently b) exposing the mixture to hydrogenation reagents for a period of at least 1 hour.

Described is a process for the preparation of a compound of the formula ##STR00001## wherein R is unsubstituted or substituted C.sub.1 C.sub.12alkyl, C.sub.2 C.sub.4alkenyl, C.sub.2 C.sub.4alkynyl, C.sub.3 C.sub.6cycloalkyl, aryl or heteroaryl, or --SR.sub.1; R.sub.1 is unsubstituted or substituted C.sub.1 C.sub.12alkyl, C.sub.2 C.sub.4alkenyl, C.sub.2 C.sub.4alkenyl, C.sub.2 C.sub.4alkynyl, cycloalkyl, aryl or heteroaryl; and X is a leaving group; which comprises a) reacting a compound of the f...

A method of manufacturing a nanocrystallite from a M-containing salt forms a nanocrystallite. The nanocrystallite can be a member of a population of nanocrystallites having a narrow size distribution and can include one or more semiconductor materials. Semiconducting nanocrystallites can photoluminesce and can have high emission quantum efficiencies.