The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 1980
Filed:
May. 09, 1979
Hansjakob Fah, Ettingen, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A process for producing hydroxydiaryl ethers of the formula ##STR1## wherein R respesents an alkyl group having 1 to 4 carbon atoms or chlorine, n represents 0, 1, 2, 3 or 4, and X represents a phenyl group of the formula II ##STR2## or a 2-pyridinyl group or a 4-pyridinyl group of the formulae ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkyl group which has 1 to 4 carbon atoms and which is mono- or disubstituted by halogen, phenyl, halogen, carboxyl, alkoxycarbonyl having 1 to 4 carbon atoms in the alkyl group, trifluoromethyl, nitro, cyano or benzoyl, R.sub.4 and R.sub.5 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms or phenyl, and R.sub.6 has all the meanings given, with the exception of halogen, for R.sub.1, R.sub.2 and R.sub.3 is disclosed. According to this process hydroxydiaryl ethers of the above formula are obtained by reacting a diether of the formula ##STR4## wherein R, n and X have the meanings given above, in a polar aprotic solvent, in the presence of 0.1 to 1 mole of alkali per mole of diether of the above formula, with a dihydroxybenzene of the formula ##STR5## wherein R and n have the meanings given above. The hydroxydiaryl ethers of the above formula can be used as intermediates for the production of .alpha.-(phenoxy-phenoxy)-alkanecarboxylic acid derivatives and .alpha.-(pyridyloxy-phenoxy)-alkane carboxylic acid derivatives, which have a herbicidal and plant-growth-regulating action.