Enichimica Secondaria, S.p.a.

Politecnico Di Milano

Alma Mater Studiorum-universitá Di Bologna

Università Degli Studi Di Roma "la Sapienza"

Universita′ Degli Studi Di Milano

Institut De Recherche Pour Le Developpement

Istituto Nazionale Di Astrofisica

Immunoclin Limited

Mario Clerici

Carlo Neri

Antonio Rinaldi

Villiam Giroldini

Massimo Guardigli

Mario Traversoni

Giampiero De Cesare

Elisa Michelini

Francisco Veas

Domenico Caputo

Giuseppe Mongelluzzo

Daria Trabattoni

Andrea Meneghin

Teresa Fornaro

Mara Mirasoli

Lorenzo Iannascoli

John Robert Brucato

Diego Scaccabarozzi

Nicola Lovecchio

Fabio Cozzolino

Francesca Esposito

Francesca Costantini

Mara Biasin

Daria Trabatoni

Daniele Paglialunga

Dorothee Misse

Giovanni Pareschi

Ciprian Ionut Popa

Augusto Nascetti

Dorothée Misse

A process is provided for preparing a substituted 2,3-dihydrobenzofuran of the general formula ##STR1## in which R.sub.a is hydrogen, halogen, alkyl, straight or branched having from 1 to 4 carbon atoms, aryl, alkaryl, --OH, --OR.sub.3, --N(R.sub.d).sub.2, where R.sub.3 and R.sub.d are alkyl, straight or branched having from 1 to 4 carbon atoms; R.sub.b is alkyl, straight or branched, having from 1 to 6 carbon atoms, aryl, alkaryl; and R.sub.c is hydrogen or the same as R.sub.b, by the rearrangement of a 1,1-bis(2-hydroxybenzene) alkyl and/or aryl-ethane, in the presence of catalytic amounts of a mineral acid or organic acid such as phosphoric, sulfuric or p-toluenesulfonic, at elevated temperatures from 180.degree. to 250.degree. C., and withdrawing the resulting products from the reaction mixture as they are formed. The starting 1,1-bis(2-hydroxybenzene) alkyl and/or aryl-ethane compounds may be obtained by the catalyzed reaction of a substituted biphenol with an aldehyde. The substituted 2,3-dihydrobenzofurans are useful in the manufacture of pesticides.

Process for preparing substituted 2,3-dihydrobenzofuran

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S. Donato Milanese, Italy

Mario Clerici