The present invention relates to a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing step, the emulsifying step, and the aggregating step and a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing and emulsifying step, and the aggregating step. The toner obtained...

The present invention provides a process for production of an anticancer taxoid brevifoliol of the formula I ##STR00001## from plants belonging to the genus Taxus by first extracting the dried and pulverized leaves of the plant with an alcohol preferably at a temperature in the range of 20-40.degree. C. and then. concentrating the solvent to obtain an alcoholic extract. The alcoholic extract obtained is then adsorbed with an adsorbent and the resulting adsorbed material is then dried at a temper...

This invention describes a method for preparing polymethoxymethylal. By this method, polymethoxymethylal is prepared by a catalytic reaction using methanol and trioxymethylene as reactants and using an ionic liquid as catalyst under a relatively moderate reaction condition. The catalyst of this invention has a high catalytic activity and a high conversion; the reaction process is simple, easy to be operated and has a strong controllability; the distribution of the products after reaction is supe...

The present invention relates to a process for preparing a polishing composition comprising a colloidal silica prepared from a silicate. The first step involves adjusting the pH of a silica dispersion comprising colloidal silica, having an average particle size of primary particles of 1 nm or more and less than 40 nm, to a range of from 10 to 14. The second step involves re-adjusting the pH of the silica dispersion obtained in the first step to a range of from 1 to 6. A density of silanol groups...

A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C.sub.3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals ascending into itself with side draw removal of crude acrylic acid and with liquid phase draw removal of acrylic acid-comprising acid water, and acrylic acid present in acid water is taken up into an extractant and then removed from the extra...

The invention relates to a process for the preparation of a compound of formula (I): ##STR00001## Which comprises reaction of a compound of formula (II) with a compound of the formula (III) in the presence of a chlorinating agent, followed by reaction of the resultant compound of the formula (IV) with a compound of formula (V) in the presence of a base: ##STR00002## wherein the various symbols are as defined in claim 1.

Intermediates of the formula QUIN: ##STR00001## and methods for their preparation are described. The intermediate compounds are useful for preparing active agents for the treatment of hepatitis C virus (HCV) infection.

A method for preparing a memory structure comprises the steps of forming a plurality of line-shaped blocks on a dielectric structure of a substrate, and forming a first etching mask exposing a sidewall of the line-shaped blocks. A portion of the line-shaped blocks is removed incorporating the first etching mask to reduce the width of the line-shaped blocks to form a second etching mask including a plurality of first blocks and second blocks arranged in an interlaced manner. Subsequently, a porti...

The present invention provides a method of preparing an intermediate for LHRH antagonists, which requires fewer steps than conventional methods and provides the intermediate in high yield and high purity.

Cefalotin is methoxylated in position 7.alpha., desacetylated and then carbamoylated in position 3, to provide acid cefoxitin without any isolation of intermediate products. The acid cefoxitin is then transformed into the sodium salt by means of ion exchange resin.