摘要:
The present invention relates to a process for preparing α-bisabolol, comprising the reaction of farnesol in the presence of a ketone, of a sulfonic acid and of a further strong acid.
摘要:
The present invention relates to a process for preparing α-bisabolol, comprising the reaction of farnesol in the presence of a ketone, of a sulfonic acid and of a further strong acid.
摘要:
The present invention relates to a process for the preparation of cis-2-(2-methylprop-1-enyl)-4-methyltetrahydropyran comprising the catalytic hydrogenation of 2-(2-methylprop-1-enyl)-4-methylenetetrahydropyran in the presence of hydrogen and a heterogeneous catalyst comprising ruthenium on a support and subsequently bringing the compounds obtained in this way into contact with a strongly acidic cation exchanger.
摘要:
The present invention relates to a process for the preparation of cis-2-(2-methylprop-1-enyl)-4-methyltetrahydropyran comprising the catalytic hydrogenation of 2-(2-methylprop-1-enyl)-4-methylenetetrahydropyran in the presence of hydrogen and a heterogeneous catalyst comprising ruthenium on a support and subsequently bringing the compounds obtained in this way into contact with a strongly acidic cation exchanger.
摘要:
Precipitated silicas and wax-coated precipitated silicas, their preparation, and their use as matting agents in inks and paints, the precipitated silicas characterized by: BET350-550 m2/g DBP number320-400 g/100 g d505-15 μm, and tamped density20-90 g/l.
摘要翻译:沉淀二氧化硅和蜡涂层沉淀二氧化硅,其制备方法及其作为油墨和油漆中消光剂的用途,沉淀二氧化硅的特征在于:BET 350-550m2 / g DBP数320-400g / 100g d505-15μm ,捣实密度为20-90克/升。
摘要:
An acylcyclohexadionethiocarboxylic S-ester of the formula ##STR1## where R.sup.1 and R.sup.2 are substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloalkyl, benzyl or phenyl, and R.sup.2 is additionally hydrogen, are prepared by reacting an acylcyclohexadione II ##STR2## with hydroxylamine or hydroxylamine-O-sulfonic acid in an inert solvent at from 0.degree. to 150.degree. C., to give an acylcyclohexadione compound III ##STR3## and then reacting the compound III with a mercaptan IVR.sup.2 --SH IVin the presence of an anhydrous acid HX to give an acylcyclohexadionethiocarboximidic S-ester salt V ##STR4## where X is the anion of the acid, and hydrolyzing the compounds V to the acylcyclohexadionethiocarboxylic S-ester I.
摘要:
In a process and device for calibrating throttle bores, in particular in injection valves for internal combustion engines, by means of hydroerosive machining of the throttle bore with a suspension, the actual through flow is compared to a predetermined reference through flow. When the actual—and reference through flows coincide, the hydroerosive machining is brought to an end. On the outflow side of the throttle bore, a counterpressure is built up, which prevents the cavitation of the fluid.
摘要:
A fuel-injection valve, in particular, a high-pressure injection valve, for injecting fuel directly into a combustion chamber of a mixture-compressing internal combustion engine with externally supplied ignition is distinguished by the fact that a guide and seating area formed by three disc-shaped elements is provided at a downstream end of the valve. A swirl element is embedded between a guide element and a valve seat element. The guide element is used to guide a valve needle which passes through it and can move in the axial direction, while a valve closing segment of the valve interacts with a valve seat surface of the valve seat element. The swirl element has an inner opening area with multiple swirl channels. The three disc-shaped elements are permanently connected to each other, forming a positive-locking joint.
摘要:
The bus system (2) for the transfer of data within a master-slave system (1) comprises a parallel data bus (3) and a serial data bus (4, 5), as well as at least one control line (15, 16) for a control signal (SnP, RnW) determining the manner of transfer, wherein each slave (S.sub.1 . . . n) can be connected to a data bus (3; 4, 5) corresponding to its interface (SIF.sub.p, SIF.sub.S) and can be controlled with respect to the manner of transfer. Upon the transfer of both serial data (SD) and parallel data (PD) with the addressing of the or each slave (Sn), a first control signal (serial, not parallel) for the type of transfer is set before a strobe signal (STRB) for the transfer of data is activated. For the determining of a write or read access, a further control signal (RnW) for the direction of transfer (read, not write) is set.
摘要:
Agents for reducing transpiration in plants and/or avoiding impairment to plants caused by heat and dry stress, comprising a synergistic mixture containing at least one acetylene compound of the formula I ##STR1## where the substituents have the following meanings R.sup.1 CH.sub.2 OH, COOH, CH.sub.2 OR.sup.4, COOR.sup.4 or CHXY,OR.sup.2 andY OR.sup.3 or X and Y together are C.sub.2 -C.sub.5 -alkylenedioxy which is unsubstituted or mono-, di- or trisubstituted by C.sub.1 -C.sub.4 -alkyl, or are a doubly bonded oxygen atom,R.sup.2, R.sup.3 C.sub.1 -C.sub.8 -alkyl andR.sup.4 C.sub.1 -C.sub.8 -alkyl, C.sub.2 -C.sub.8 -alkoxyalkyl, C.sub.2 -C.sub.4 -haloalkyl, phenyl or C.sub.7 -C.sub.16 -phenylalkyl,and at least one phenylbenzylurea of the general formula II ##STR2## where the substituents have the following meanings R.sup.5 hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, phenyl or C.sub.7 -C.sub.16 -phenylalkyl andR.sup.6 -R.sup.11 hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy halogen, C.sub.1 -C.sub.4 -haloalkyl, C.sub.1 -C.sub.4 -haloalkoxy, phenyl, phenoxy, nitro, cyano, hydroxy, OR.sup.4, CHO or COOR.sup.4.