Labaz

Jacques Le Blay

Charles Pigerol

Claude Grain

Paul De Cointet De Fillain

Souli Nanthavong

Paul De De Fillain

Thiophene compounds of formula: ##STR1## wherein R.sub.1 represents an alkyl radical containing 1 to 4 carbon atoms, a cycloalkyl, cycloalkenyl or aralkyl radical, R.sub.2 represents an atom of hydrogen or a methyl radical with the proviso that when R.sub.2 represents methyl R.sub.1 represents alkyl, or R.sub.1 and R.sub.2, when they are taken together, represent, with the carbon atom to which they are attached, a cyclopolymethylene radical having from 3 to 6 carbon atoms, whereby a reaction medium comprising a solvent and a compound of the general formula: ##STR2## wherein R.sub.3 represents an atom of alkali metal, and R.sub.4 represents an atom of hydrogen or of alkali metal is treated at a temperature between -20.degree. and +80.degree. C with the appropriate quantity of a halide of the general formula:

Thiophene compounds and the production thereof

New stabilizers of polymers and co-polymers of vinyl chloride, the said stabilizers being 2-phenyl-indole derivatives corresponding to the formula: ##STR1## wherein R represents a phenyl radical, an amino group, optionally substituted by an acetyl or benzoyl radical, a mercapto group, optionally substituted by a branched-or straight-chain alkyl group containing from 1 to 12 carbon atoms or by a cyclohexyl radical, a carboxyl radical, a radical represented by the formula:

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Luisant, France

Jacques Le Blay