Enichem S.p.a

Montedison S.p.a.

Eniricerche S.p.a.

Farmitalia Carlo Erba

Montedison Fibre S.p.a.

Aziende Colori Nazionali Affini Acna S.p.a.

Presidenza Del Consiglio Dei Ministri

Giampiero Borsotti

Roberto Santi

Paolo Biagini

Gabriele Lugli

Viviano Banzi

Giuseppe Ribaldone

Antonio Alfonso Proto

Liliana Gila

Karel Bujadoux

Marco Foa

Tullio Pellizzon

Cecilia Querci

Norberto Gatti

Franco Gonzati

Fabrizio Forlini

Bridged cyclopentadienyl derivatives having general formula (I)

Bridged cyclopentadienyl derivatives and process for their preparation

Metallocene complexes of a metal M selected from titanium, zirconium and hafnium, comprising at least one anionic group A containing an .eta..sup.5 -cyclopentadienyl ring co-ordinated with the metal M, wherein the anionic group is substituted in at least one position of the cyclopentadienyl ring with a radical having the formula:

Substituted metallocene catalyst for the (co)polymerization of olefins

A description follows of catalysts of the metallocene type which can be used in the (co)polymerization of alpha-olefins, particularly in the preparation of elastomeric copolymers of ethylene.

Catalysts for the polymerization of alpha-olefins

Cyclopentadienyl derivatives are described having general formula (I) ##STR1## where R, R.sub.1, R.sub.2, R.sub.4, equivalent to or different from one another, are selected from: --H, alkyl radicals having a number of carbon atoms from 1 to 5, cycloalkyl radicals having a number of carbon atoms from 5 to 8, aryl and alkylaryl radicals having a number of carbon atoms from 6 to 8, aralkyl radicals having a number of carbon atoms from 7 to 9; n is an integer from 2 to 18; with the proviso that the number of R different from H does not exceed 2; with the exclusion of the compound having n=3, R.dbd.R.sub.1 .dbd.R.sub.2 .dbd.R.sub.4 .dbd.H. The invention a-so describes the process for the preparation of the above-mentioned cyclopentadienyl derivatives.

Cyclopentadienyl derivatives and process for their preparation

A catalyst active in the (co)polymerization of .alpha.-olefins is obtained by putting the following components in contact with each other:

Metallocene catalyst for the (CO)polymerization of .alpha.-olefins

An improved method for synthesizing alkylpolyglucosides comprising reacting a glycoside with a long-chain alcohol in the presence of a novel type of catalyst, constituted by an alkali or aryl sulfonic acid, wherein the sulfonic group is sterically hindered. Using these catalysts, a raw product is obtained which is practically free from byproducts. The resulting alkyl polyglucosides are completely biodegradable surfactants and can be used to formulate detergents.

Process for preparing APG's

There is disclosed a process for the preparation of 2-methyl-5-pyrazinoic acid consisting of electrochemically oxidizing a compound having formula: ##STR1## wherein X is --OH, Cl, Br, --O--CO--R, --O--SO.sub.2 --R, in which R is a C.sub.1 -C.sub.5 alkyl radical, optionally substituted with F or Cl, or it is a C.sub.6 -C.sub.12 aryl radical, in an aqueous alkaline medium, at a temperature ranging from 20.degree. C. to 90.degree. C., using anodes coated with nickel oxide-hydroxide.

Electrochemical synthesis of 2-methyl-5-pyrazinoic acid

The invention relates to a chemiluminescent composition, i.e. one which emits light when its various constituent components are mixed together. The composition consists of at least two separate solutions of at least one oxalate, at least one fluorescent substance, hydrogen peroxide and at least one catalyst, in which those components which react together are kept separated. The characteristic of the 9,10-bis(phenylethynyl)anthracene is that the oxalate is a bis(dihalo-acylphenyl)oxalate. This compound is easily and economically produced and is easily soluble in the solvents used, to provide high-intensity light emission for long time periods. The 2,4- or 2,6-acyl substituted phenyloxalate also forms a subject matter of the invention.

Chemiluminescent composition, and a reactive component suitable for such

A process for the synthesis of 2-methoxy-6-bromo-naphthalene, wherein the 2-methoxy-naphthalene is brominated by means of Br.sub.2 to 1,6-dibromo-2-methoxy-naphthalene and the latter is then dehalogenated, without any separation from the liquid medium of reaction, by addition of iron.

Process for the synthesis of 2-methoxy-6-bromo-naphthalene

New compounds are disclosed having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 may be the same or different and are selected from the class consisting of H, Cl and OCH.sub.3. They are useful as pigments. They are prepared by reacting a substituted or unsubstituted 1-aza-2-hydroxybenzanthrone with 2,3-dichloro-1,4-naphthoquinone, in the presence of pyridine, at a temperature between 80.degree. and about 120.degree. C.

Heterocyclic polynuclear pigments and process for preparing same

A process is disclosed for the preparation of 2-hydroxybenzanthrone and substituted derivatives thereof having the general formula: ##STR1## wherein: R.sub.1 = H, OH

Method for the preparation of 2-hydroxybenzanthrone compounds

1-AZA-2-HYDROXYBENZANTHRONE, USEFUL AS AN INTERMEDIATE FOR SYNTHESIZING DYES IS OBTAINED BY THE DIRECT REACTION OF ALKYL ESTERS OF ANTHRAQUINONE-1-ACETIC ACID WITH AMMONIA IN HYDROXYLATED SOLVENTS AND IN THE PRESENCE OF STRONG BASES AND/OR REDUCING SUBSTANCES.

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Novara, Italy

Giampiero Borsotti