摘要:
The invention provides a novel method for the cis to trans isomerization of an alkenyl alcohol in a very simple process. The inventive method comprises heating the cis-isomer at a temperature of, for example, 150.degree. to 200.degree. C. in the presence of selenium metal in a powdery form with agitation.
摘要:
A process for preparing a mixture of isomers of caryophyllene alcohol and dihydrocaryophyllene alcohol including 10,10-dimethyl-2,6-dimethylene bicyclo[7.2.0]undecan-5-ol by isomerizing caryophyllene oxide or dihydrocaryophyllene oxide using an aluminum isopropylate catalyst in a toluene solvent at temperatures in the range of from about 100.degree. C. up to about 150.degree. C. is described.
摘要:
When 1-halogeno-3-alkene-2-ol is reacted with an ortho-carboxylic ester and/or a ketene acetal, a .gamma.-halogeno-.delta.-unsaturated-carboxylic ester is obtained as a main reaction product. When this intermediate is treated with a basic substance, a substituted cyclopropane-carboxylic ester is formed. This ester can be used as an insecticide or an agricultural chemical as it is or after the alcohol residue of the ester has been converted to other alcohol residue.
摘要:
Unsaturated alcohols represented by the general formulas (I) and (II) below ##STR1## wherein R is a substituted or unsubstituted hydrocarbon radical, R.sub.2 and R.sub.3 are hydrogen or lower alkyl groups, and R and R.sub.2 may be linked together are mutually isomerized in the presence of a catalyst comprising a transition metal compound of Groups V, VI and VII of the Mendeleev Periodic Table.
摘要:
New cycloaliphatic unsaturated ketones and their use as perfuming and odor-modifying agents in the manufacture of perfumes and perfumed products, and as flavoring and taste-modifying agents in the preparation of foodstuffs in general and imitation flavors for foodstuffs, beverages, animal feeds, pharmaceutical preparations and tobacco products.Methods for the preparation of said cycloaliphatic unsaturated ketones.
摘要:
The present invention discloses an improved process for extracting cholesterol in high yield and purity from fish oil waste residue. The so obtained cholesterol of pharmaceutical grade is useful as a precursor for the preparation of vitamin D3.
摘要:
The present disclosure relates to a method for preparation of 1,4-cyclohexanedimethanol. According to the present disclosure, two step reduction reactions are conducted using terephthalic acid as starting material, and an isomerization process for increasing the rate of trans isomers of CHDA is introduced therebetween, thereby providing a method capable of stably preparing CHDM with high rate of trans isomers.
摘要:
Provided is a preparation method for a cyclohexane dimethanol (CHDM), which can have a high trans content through particular conditions, additive addition, or reactant addition, which is controlled in a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction, and a cyclohexane dimethanol prepared thereby.