摘要:
Die Erfindung betrifft ein Verfahren zur katalytischen Dehydrierung von Diolen mit 3 bis 10 Kohlenstoffatomen an einem Kupfer und Chrom enthaltenden Katalysator, wobei in einem 2-Stufen-Verfahren die Diole zunächst in der Flüssigphase über den Katalysator geleitet werden und das so erhaltene Reaktionsgemisch anschließend in der Gasphase über den Katalysator geleitet wird.
摘要:
A process for producing cis-whiskey-lactone represented by formula (A), which is one of the flavoring components of whiskey or wine, selectively and readily, which comprises hydrolyzing the lactone part of trans-whiskey-lactone with potassium hydroxide, adding an alkyl group to the product by the reaction with isopropyl bromide to form isopropyl (3S, 4S)-4-hydroxy-3-methyloctanoate, reacting the formed ester with diethyl azodicarboxylate in the presence of both triphenylphosphine and an azodicarboxylate in the presence of both triphenylphosphine and an azodicarboxylic ester to form isopropyl (3S, 4S)-4-(3', 5'-dinitrobenzoyloxy)-3-methyloctanoate, and hydrolying the formed ester with a 2 % aqueous sodium hydroxide solution.
摘要:
A ferroelectric liquid crystal composition including : at least one optically active compound of the formula (I) : where R 1 and R 2 are, the same or different, a substituted or unsubstituted straight or branched chain alkyl group having 1 to 15 carbon atoms, k represents an integer of 0 or 1, and * represents an asymmetric carbon atom ; and at least one compound selected from the group consisting of: compounds of the formula (II) : where R 3 and R 4 are a straight or branched chain alkyl or alkoxy group having 1-15 carbon atoms, each represent X represents -O-, -CO- or a single bond, m and n are independently an integer of 0 or 1 ; compounds of the formula (III) : where R 5 and R 6 are, the same or different, a straight or branched chain alkyl or alkoxy group having 1-15 carbon atoms, and p is an integer of 0 or 1 ; said ferroelectric liquid crystal composition exhibiting at least nematic phase, smectic A phase and smectic C phase.
摘要:
A process for stereocontrolled preparation of a medicinally significant hydroxyester, hydroxyamide or lactone compound of structural formula:
comprises the addition of homoenolate equivalents to chiral α-amino aldehydes. The hydroxyester, hydroxyamide, or lactone reaction products are useful as inhibitors of the HIV protease or of renin, or as intermediates in the preparation of inhibitors of the HIV protease or renin.
摘要:
Lactone compounds, suitable for use in liquid crystal composition, have the formula: wherein R¹ is a straight or branched alkyl or alkoxy group of 1 to 15 carbon atoms; R² is a straight or branched alkyl group of 1 to 16 carbon atoms; -A- is a single bond, a 1,4-phenylene group or 1,4-cyclohexylene group; and * indicates an asymmetric carbon atom.
摘要翻译:适用于液晶组合物的内酯化合物具有下式:其中R 1是1-15个碳原子的直链或支链烷基或烷氧基; R 2是1至16个碳原子的直链或支链烷基; -A-是单键,1,4-亚苯基或1,4-亚环己基; *表示不对称碳原子。