The invention relates to a method of preparing nitrogen macrocycles having formula (I). The inventive method comprises a step involving the reaction of compounds (II) and (III) in order to form a compound having formula (IV). Said compound is subsequently made to react with a compound having formula (V) in order to form a compound having formula (VI). The latter compound is then subjected to an acid treatment ##STR00001##

A process for the preparation of a haloalkyldialkylchlorosilane is provided, wherein at the end of a hydrosilylation reaction, the product is recovered and iridium is recovered, the iridium being found in its original form of catalyst or in a converted form, the recovery of the iridium taking place under the following conditions a), b) and c): a) the recovery of the iridium is carried out: 1. either directly on the reaction medium at the end of the reaction, 2. or on the liquid distillation resi...

A process for preparing 3(4),8(9)-bis(aminomethyl)tricycle-[5.2.1.0.sup.2,6]decane by hydroformylating dicyclopentadiene with subsequent reductive amination wherein the hydroformylation of dicyclopentadiene is carried out in two stages, and, in a first hydroformylation stage, the reaction is effected in a heterogeneous reaction system using an aqueous solution of transition metal compounds, containing water-soluble organic phosphorus (III) compounds in complex-bound form, of group VIII of the Pe...

A method for preparing electronic data for transmission includes calculating a duration for compressing the electronic data, calculating a duration for transmitting the electronic data if not compressed, and compressing the electronic data only if the duration for compressing does not exceed the duration for transmitting.

A process for preparing (per)fluorohalogenethers having general formula: ##STR00001## wherein: A and A', equal to our different from each other, are selected among Cl, Br, H; m=1, 2; n=0, 1; R.sub.1 is a fluorinated substituent, preferably perfluorinated, selected from the following groups: C.sup.1-C.sub.20 linear or branched alkylic; C.sub.3-C.sub.7 cycloalkylic; aromatic, C.sub.6-C.sub.10 arylalkyl; heterocyclic or C.sub.5-C.sub.10-alkylheterocyclic; preferably perfluoroalkyl; R' is as defined...

A process for preparing cyclic organohydrogensiloxanes is disclosed. The process comprises the steps of (A) and (B). Step (A) comprising contacting a silane of the formula RHSiCl.sub.2, where R is selected from alkyl radicals having 1 to 12 carbon atoms and aryl radicals, with water to form a hydrolyzate. The hydrolyzate formed in step (A) comprising cyclic organohydrogensiloxanes and linear organohydrogensiloxanes. Step (B) comprising contacting the hydrolyzate formed in (A) with an acidic rear...

The invention relates to a new industrially useable process for preparing tropenol, optionally in the form of the acid addition salts thereof.

A method for preparing hydroxylamine, comprising the steps of: (i) pretreating the acidic buffer solution with the compounds having a functional group represented by formula (I), thereby removing metal impurities from the acidic buffer solution; and (ii) reducing nitrate ions in the acidic buffer solution with hydrogen to give hydroxylamine in the presence of catalysts, ##STR00001## According to the present invention the selectivity for reducing nitrate ions to give hydroxylamine can be signific...

A method for preparing a diene elastomer, such as a butadiene homopolymer or copolymer, in particular, a polybutadiene, with a high level of cis-1,4 linkages that has both a Mooney viscosity greater than or equal to 40 and a polydispersity index of less than 2.1. The method comprises a reaction of a catalyst system with at least one conjugated diene monomer to be polymerized and the catalyst system is based on at least:optionally one preforming conjugated diene;one salt of one or more rare earth...

The present invention relates to a method of preparing a porous cross-linked polysaccharide chromatography matrix, which comprises to provide an aqueous solution of a gellable polysaccharide, wherein part of the hydroxyl groups are substituted with groups which are not susceptible to nucleophilic attack; to provide essentially spherical droplets of the substituted polysaccharide solution; to form a gel of the substituted polysaccharide solution; and to cross-link the gel by adding a cross-linkin...