摘要:
The present invention refers to a process for the preparation of unsaturated ketones or aldehydes by pyrolysis of a lactone, in the presence of a reducing agent such as molecular hydrogen or a carboxylic acid, and in the presence of a catalyst, optionally supported, comprising at least one metal selected from the group consisting of Y, Ti, Cd, Mn, Zn, Sc and Zr.
摘要:
The present invention relates to a process for the preparation of compounds of a 1,4-dialkyl-2,3-diol-1,4-butanedione by a catalytic aldol condensation between an alkyl glyoxal and an a-hydroxy ketone.
摘要:
The invention concerns cycloaliphatic ketones of formula (I) which have two conjugated double bonds in positions 1 and 3, or 2 and 4, as shown by the dashed lines, and in which formula R defines a C1-C3 alkyl radical. The cycloaliphatic ketones are used as intermediate products in the preparation of jasmonic derivatives and are obtained by an addition reaction between cyclopentanone and an aldehyde of formula (II) of which the double bond has the configuration (E) and in which R has the meaning given above, to provide a dienic cyclopentanone of formula (Ia) E,E. The resulting cyclopentanone is optionally subjected to a heat treatment to give a cyclopentenone of formula (Ib) Z. 2-(E,2'Z)-but-2'-enylidene-cyclopentanone, 2-(1'Z)-but-1'-enyl-cyclopent-2-enone, 2-(E,2'E)-pent-2'-enylidene-cyclopentanone, 2-(Z,2'E)-pent-2'-enylidene-cyclopentanone, 2-(1'Z)-pent-1'-enyl-cyclopent-2-enone, dimethyl [2-(pent-(1'Z)-enyl)-3-oxo-1-cyclopentyl]-malonate malonic esters and dimethyl [2-(but-(1'Z)-enyl)-3-oxo-1-cyclopentyl]-malonate malonic esters are novel chemical compounds.
摘要:
The present invention relates to the field of organic synthesis and more particularly to a new process for the dimerisation of alkyl glyoxals, said process being promoted by an alkaline salt of the hydoxymethanesulfinic acid and is performed at a pH comprised between 3.5 and 9.5.
摘要:
The present invention relates to a quaternised amine ester derivative which is useful as anti-gelling or viscosity-control ingredient in softening articles, especially fabric softener. Said quaternised amine ester derivative is a compound derived from a 3-(dialkylamino)-1,2-propanediol and a non-linear fatty acid, such as the isostearic acid.
摘要:
The invention concerns cycloaliphatic ketones of formula (I) which have two conjugated double bonds in positions 1 and 3, or 2 and 4, as shown by the dashed lines, and in which formula R defines a C1-C3 alkyl radical. The cycloaliphatic ketones are used as intermediate products in the preparation of jasmonic derivatives and are obtained by an addition reaction between cyclopentanone and an aldehyde of formula (II) of which the double bond has the configuration (E) and in which R has the meaning given above, to provide a dienic cyclopentanone of formula (Ia) E,E. The resulting cyclopentanone is optionally subjected to a heat treatment to give a cyclopentenone of formula (Ib) Z. 2-(E,2'Z)-but-2'-enylidene-cyclopentanone, 2-(1'Z)-but-1'-enyl-cyclopent-2-enone, 2-(E,2'E)-pent-2'-enylidene-cyclopentanone, 2-(Z,2'E)-pent-2'-enylidene-cyclopentanone, 2-(1'Z)-pent-1'-enyl-cyclopent-2-enone, dimethyl [2-(pent-(1'Z)-enyl)-3-oxo-1-cyclopentyl]-malonate malonic esters and dimethyl [2-(but-(1'Z)-enyl)-3-oxo-1-cyclopentyl]-malonate malonic esters are novel chemical compounds.
摘要:
The present invention relates to a process for the preparation of compounds of a 1,4-dialkyl-2,3-diol-1,4-butanedione by a catalytic aldol condensation between an alkyl glyoxal and an a-hydroxy ketone.
摘要:
The present invention relates to the perfume or flavor industry. It concerns more particularly an acetal of formula (I), in which the symbols R represent, independently or simultaneously, a linear or branched saturated or unsaturated C1 to C4 hydrocarbon group; or the two R are bonded together to form a saturated ring having 5 to 7 atoms and including the oxygen atoms to which said R groups are bonded, this ring being possibly substituted by methyl or ethyl groups; and the wavy line indicates that the double bond in position 4 has a configuration of the type (Z) or (E) or a mixture of the two configurations. The invention relates also to the use of such a compound as a perfuming or flavoring ingredient, as well as the perfumed or flavored articles or perfuming or flavoring compositions containing a compound according to the invention.
摘要:
The present invention relates to the perfume or flavor industry. It concerns more particularly an acetal of formula (I), in which the symbols R1 represent, independently or simultaneously, a linear or branched saturated or unsaturated C¿1? to C4 hydrocarbon group; or the two R?1¿ are bonded together to form a saturated ring having 5 to 7 atoms and including the oxygen atoms to which said R1 groups are bonded, this ring being possibly substituted by methyl or ethyl groups; and the wavy line indicates that the double bond in position 4 has a configuration of the type (Z) or (E) or a mixture of the two configurations. The invention relates also to the use of such a compound as a perfuming or flavoring ingredient, as well as the perfumed or flavored articles or perfuming or flavoring compositions containing a compound according to the invention.