Symrise Gmbh & Co Kg

Dr. Straetmans Chemische Produkte Gmbh

Symrise Ag

Markus Nobis

Bernd Hölscher

Jan Jänichen

Wilfried Petersen

Rudolf Jenny

The present invention relates to a process for the preparation of a compound of the formula B having the following steps: provision of a compound of the formula A intramolecular reaction of the compound of the formula A in the presence of an aluminium siloxide of the formula (Ia) or (Ib). 

Intramolecular Prins reaction and catalysts suitable therefor

A process to manufacture 4-methoxybenzoic acid from anethole. This raw material can be obtained from a variety of plant materials and thus offers a renewable alternative to fossil raw materials. Another aspect of the present invention is the use of 4-methoxybenzoic acid gained from vegetal anethole as raw material in cosmetic and dermatologic products and/or aroma components in foodstuffs.

Process to manufacture 4-methoxybenzoic acid from herbal anethole and the use of 4-methoxybenzoic acid in cosmetic and dermatologic products as well as foodstuffs

The invention relates to a process for the preparation of a ketone from a tertiary alcohol having a double bond in the alpha position, that includes the step of contacting tertiary alcohol having a double bond in the alpha position with ozone in the presence of an inorganic base under ketone-forming reaction conditions.

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Lyss, Switzerland

Markus Nobis