Consortium Fur Elektrochemische Industrie Gmbh

Consortium Fur Elektrochemische Gmbh

Helmut Gebauer

Walter Hafner

Marlies Regiert

Franz-Heinrich Kreuzer

Hans Mehlin

Hans-Jurgen Eberle

Erich Markl

Wilhelm Friedrich

Peter Ritter

A process for producing cis-2-methyl-2-butenoic acid, which process is preferably based on technical 2-methyl-2-butene nitrile and leads to pure products preferably without costly rectification. The technical nitrile is hydrolyzed by concentrated sulfuric acid at temperatures of up to 130.degree. C. and, following dilution of the sulfuric acid to about 50%, at temperatures of up to 130.degree. C. It is treated by distilling and fractional crystallization.

Process for producing 2-methyl-2-butenoic acid

Compounds of the general formulae ##STR1## in which R may be a methyl or ethyl radical and R.sup.1 may be a hydrogen, methyl or ethyl radical are disclosed. Also provided as part of the present invention are processes for the preparation of the above compounds. The compounds of the invention are useful as scents.

Alcohols and ethers having cyclododecyl and cyclododecenyl groups,

Hexamethylcyclotrisiloxane is prepared by heating linear, branched, or cross-linked organopolysiloxanes containing at least 50 mol percent of dimethylsiloxane units to at least 350.degree. C. in the absence of substances which attack the siloxane group during heating and simultaneously distilling off the cyclic dimethylpolysiloxanes thus formed. The hexamethylcyclotrisiloxane thus prepared is an excellent carrier for fragrant materials, especially where the carrier is present in admixture with other carrier substances such as tetramethylcyclobutanedione.

Method for preparing hexamethylcyclotrisiloxane and uses for the same

The invention discloses compounds of the general formula ##STR1## in which R represents a methyl radical or a methoxy radical when R.sup.1 is a hydrogen atom; or

Alcohols containing 2-methylphenyl or 2-methoxyphenyl groups, and

A solid which contains a fragrant substance and/or a disinfectant and at least one sublimable substance, in which the sublimable substance consists at least in part of hexamethylcyclotrisiloxane and/or tetramethylcyclobutanedione. When the solid is exposed to the environment, it releases the fragrant substance and/or disinfectant.

Solid which releases a fragrant substance and/or a disinfectant

The compound 16-oxa-bicyclo-[13.1.0]-hexadec-7-ene, and a process for its production, having the structural formula: ##STR1## is disclosed. 16-oxa-bicyclo-[13.1.0]-hexadec-7-ene is useful as a fragrance and may be produced by reacting cyclopentadeca-1,8-diene in the presence of an organic peracid.

16-Oxa-bicyclo-[13.1.0]-hexadec-7-ene and its application as a fragrance

Compounds of the general formula (I) ##STR1## and compounds of the general formula (II) ##STR2## in which R.sup.1 represents --OH, --CH.sub.2 OH, --CH.sub.2 --OCH.sub.3, --CHOH--CH.sub.3, --CHO or --CH(OCH.sub.3).sub.2,

Aldehydes, acetals, alcohols and ethers having 3-methyl- or

Compounds of the general formula ##STR1## wherein A is the ##STR2## group and in which R.sup.1 stands for hydrogen, methyl, ethyl, n-propyl, isopropyl, methoxy, ethoxy, n-propoxy and isopropoxy and R.sup.2 and R.sup.3 are hydrogen, methyl and ethyl. The compounds are used as perfume substances.

Trimethylcyclohexene derivatives, their preparation and use as perfume

The invention relates to 2-ethyl-2-prenyl-3-hexenol, its preparation by the reduction of 2-ethyl-2-prenyl-3-hexenal, and its use as an aromatic substance by itself or as an ingredient in cosmetic compositions.

2-ethyl-2-prenyl-3-hexenol its preparation and use as a fragrant

The invention relates to 1,1-dimethoxy-2,5-dimethyl-2-vinyl-4-hexene, 1,1-dimethoxy-2,2,5-trimethyl-4-hexene, and 1,1-dimethoxy-2,2-dimethyl-3-phenyl-propane. The invention also relates to the production of these compounds and their use as fragrant substances in the cosmetics, detergent and perfume industries.

Alpha-tertiary dimethylacetals and their use as fragrant substances

Alpha-tertiary nitriles, a process for making the same, and fragrant substances containing the same, in which the nitriles having the general formula ##STR1## wherein R.sub.1 represents an alkyl radical with 1-3 carbon atoms,

Alpha-tertiary nitriles

The invention relates to 13-oxabicyclo[10.3.0]pentadecanes alkylated in the 14-position and, optionally, in the 15-position and to 13-oxabicyclo[10.4.0]hexadecanes alkylated in the 14-position and, optionally, in the 16-position. The compounds according to the invention may be used as odorizers.

Substituted macrobicyclic ethers, the manufacture and use thereof

Compounds of the general formula I: ##STR1## wherein R.sub.1 and R.sub.2 are equal or different alkyl-, alkoxyalkyl-, or aryl groups, or together form a ring; R.sub.3 is an allyl or benzyl radical; and R.sub.4 and R.sub.5 represent hydrogen, alkyl, alkoxyalkyl, alkenyl or further compounds of the formula II: ##STR2## wherein R.sub.1, R.sub.2, R.sub.4 and R.sub.5 have the meaning indicated above and R.sub.6 stands for hydrogen or methyl or to compounds which are modified by the addition of hydrogen to at least one olefinic or carbonylic double bond of compounds of the general formula I or II. The invention also relates to a process for preparing the new compounds. The compounds of the general formula II are obtained by thermal treatment of a selection of compounds of formula I, for which R.sub.3 stands for the allyl or methallyl radical. The compounds according to the invention are used as fragrant and flavoring substances.

.beta.-.gamma.-Unsaturated ketones and isoprenoid 2,6 diones, a process

Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are equal or different aliphatic radicals, if desired, branched, and R.sub.3 stands for H or CH.sub.3. The invention also relates to a process for making these compounds and their use as fragrant and flavoring products.

Growing community of inventors

Munich, Germany

Helmut Gebauer