Abstract:
Benzofuranes are obtained by intramolecular condensation of aromatic oxo compounds having an oxymethylene group in ortho position. The condensation is effected with strongly alkaline agents in solution or in an alkali metal hydroxide melt. The products are useful as scintilators and optical brighteners.
Abstract:
New bisbenzofuranes which are connected by a direct bond or a bridgemember being in conjugation with the double bonds of the furane nuclei are obtained by intra- or intermolecular condensation reactions. The products are useful as optical brighteners, especially for detergents.
Abstract:
Novel benzofurane compounds are obtained by intramolecular condensation reactions of the corresponding ketones. The products are useful as optical brighteners.
Abstract:
Novel azomethines are obtained when reacting a tertiary amine with an aromatic aldehyde or ketone having in orthoposition an activated methoxy group. These azomethines are capable of ring closure to yield a benzofurane and said tertiary amine. The benzofuranes are optical brighteners tranquilizers or intermediates for optical brighteners, fluorescent dyestuffs, scintiallators, sensibilizers for electrophotographic coatings.