Abstract: Process for the preparation of 3,4-methylenedioxymandelic acid, wherein glyoxylic acid is reacted with 1,2-methylenedioxybenzene in a strongly acid medium.

Abstract: Aromatic hydroxy aldehydes are prepared by the simultaneous oxidation and decarboxylation of hydroxy aryl glycolic acids by reacting same with oxidizing agents in aqueous-acid medium.

Abstract: The invention concerns a new process for the production of 2-alkoxy-4-propen-1-yl phenols of the formula ##STR1## in which R represents the methyl or ethyl radical wherein 2-alkoxy phenols of the formula ##STR2## in which R is as defined above, are initially condensed with propionaldehyde in the presence of acid catalysts, and the resulting condensation product is subsequently split by heating in the presence of a basic catalyst to form the phenols of formula I.

Abstract: Process for the preparation of alkyl aryl ethers by reacting aromatic hydroxy compounds with aliphatic alcohols in the presence of strongly acidic cation exchangers based on synthetic resins using the aromatic hydroxy compound in excess of the aliphatic alcohol.

Abstract: The invention concerns a germ-inhibiting, microbicidal or deodorizing composition comprising p-isopropyl- and/or p-tert.butyl-.alpha.-methyl hydrocinnamic alcohol, together with a carrier or diluent.

Abstract: The invention concerns new 2-alkoxy-4-alkenyl phenols of the formula ##STR1## wherein R.sub.1 is methyl or ethyl andR.sub.2 and R.sub.3 are different from one another and mean hydrogen or methyl;A process for the preparation of said 2-alkoxy-4-alkenyl phenols comprising condensing 2-alkoxy phenols with butyraldehyde or isobutyraldehyde in the presence of an acid catalyst and thermal splitting the condensation product in the presence of a catalyst; and the use of the new 2-alkoxy-4-alkenyl phenols as odorants.

Abstract: The invention relates to a new process for the production of anethole (4-methoxy propen-1-yl benzene), wherein anisole is condensed with propionaldehyde in the presence of an acid catalyst and the resulting condensation product is subsequently split in the presence of an acid at a temperature in the range from 100.degree. to 300.degree. C.

Abstract: Glyoxylic acid is selectively extracted from its aqueous mixture with glyoxal by means of aliphatic or cycloaliphatic alcohol containing about 4 to 8 carbon atoms, a ketone containing about 4 to 8 carbon atoms, and an ester of an aliphatic carboxylic acid and aliphatic alcohol each containing up to about 6 carbon atoms, the esters containing a total of about 3 to 8 carbon atoms, allowing the mixture to stratify and separating the solvent layer enriched in glyoxylic acid.

Abstract: The invention concerns the new tricyclic compound, 4-(tricyclo [5.2.1.0.sup.2,6 ] decyl-8)-butanal, a process for its preparation and its use as a perfume.

Abstract: A process for the separation of optically active d- and l-isomers of a compound selected from the group consisting of menthol, neomenthol and isomenthol, which comprises esterifying a d,l-isomeric mixture of the compound with an acid selected from the group consisting of benzoic acid optionally carrying at least one substituent on the benzene ring and hexahydrobenzoic acid; forming a supersaturated solution or a supercooled melt of the d,l-ester; inoculating the solution or melt with crystals of the d- or l-form of the ester to effect selective crystllization of one of the two optical isomers; separating the crystals and subjecting them to hydrolysis to yield the corresponding enantiomorph of the starting compound.