Brichima, S.p.a.

Industrie Chimiche Caffaro S.p.a.

Anic S.p.a.

Enichem Sintesi S.p.a.

Paolo Maggioni

Francesco Minisci

Mariano Correale

Livius Cotarca

Attilio Citterio

Alfonso Nardelli

Francesco Ancillotti

Giuseppe Terzoni

Stefano Sguassero

Pietro Panseri

Lidio Micucci

Francesco Mauri

Process for producing an omega-functionalized aliphatic carboxylic acid

A process for the production of benzofuran derivatives having the general formula, ##STR1## wherein R is alkyl, in particular of 2,3-dihydro-2,2-dimethyl benzofuran-7-ol, starting from pyrocatechol ethers in one step operation. The process essentially consists of heating a solution of pyrocatechol ether in an inert organic solvent in the presence of a catalyst comprising metals of 3.degree. and 4.degree. group of the Periodic System in form of carboxylates or of modified zeolites. The products are known intermediates for the production of insecticides.

Process for the production of certain 2,3-dihydro-benzofuran derivatives

A process for preparing o-isopropoxyphenol (I) by means of the reaction: ##STR1## in which X is a halogen atom and in which the pyrocatechol (II) is reacted with the isopropyl halide (III) in the presence of an alkaline base in the solid state and of a solid-liquid phase transfer catalyst, in a reaction medium constituted by one or more organic solvents. The catalyst is constituted by a quaternary ammonium or phosphonium salt. The reaction is conducted in a nitrogen atmosphere, at atmospheric pressure, under agitation, at a temperature of preferably between 50.degree. C. and 130.degree. C.

Process for the synthesis of o-isopropoxyphenol

A process is described for preparing 2,3-dihydro-2,2-dimethylbenzofuran-7-ol (I), which is a useful intermediary in the preparation of Carbofuran, a known multi-functional insecticide. The process consists essentially of reacting the pyrocatechol and a methallylhalide in an inert organic solvent in the presence of a solid inorganic base and a suitable catalyst, to obtain o.methallyloxyphenol with high conversion and high selectivity; this product is thermally transposed to o.methallylpyrocatechol, which is finally cyclized to the product (I) by heterogeneous catalysis in the presence of solid acid catalysts. All stages of the process can be carried out in a single reaction medium, without separating intermediate products.

Process for preparing 2,3-dihydro-2,2-dimethylbenzofuran-7-ol

Hydroxyaromatic compounds, especially phenols, are reacted with an alkyl tert.butyl ether in the presence of an acidic catalyst and the as formed light alcoholic fractions are removed by flashing.

Terbutylating hydroxyaromatic compounds

Process industrially and economically useful for preparing difunctional aliphatic organic compounds of formula

Process for producing difunctional aliphatic organic compounds

This invention consists of a process for preparing bifunctional aliphatic organic compounds of at least 6 carbon atoms, wherein a cycloaliphatic oxyhydroperoxide is reacted with an alpha-olefine having its double bond activated by a conjugate electron-attracting group, in the presence of a bivalent Cr salt, a bivalent V salt or a trivalent Ti salt.

Process for preparing bifunctional aliphatic organic compounds

A method for preparing aromatic methylenedioxybenzene products which are optionally substituted in the aromatic ring by alkyl, aldehydo, carboxy, alkoxy, halo or nitro moieties; which comprises treating the corresponding dihydroxybenzene with methylene chloride in the presence of a catalyst selected from among ammonium, phosphonium or arsonium chlorides and bromides. The reaction is conducted in the aqueous phase in the presence of a suitable base, such as a sodium derivative to form a sodium salt of the dihydroxybenzene reactant. The aromatic methylenedioxy products of this invention are known compounds which are used in the chemical, pharmaceutical and cosmetic industries and they have utility as intermediates in the preparation of other known compounds.

Process for preparing aromatic methylene-dioxy compounds

A method for preparing aromatic aldehydes and ketones in which the aldehydo or keto group is bonded directly to the aromatic ring; which comprises oxidizing an alkyl substituted aromatic compound or an aromatic compound which is substituted by an alpha-hydroxyalkyl moiety, via treatment with a persulfate and a metal catalyst. The metal catalysts include, for example, (1) iron salts and silver salts, or (2) a redox pair of salts such as an iron salt in combination with a copper salt or a silver salt in combination with a copper salt.

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Montevecchia, Italy

Paolo Maggioni