摘要:
A process for producing 2,4-dihydroxyacetophenone is provided wherein resorcinol and acetic acid are reacted in the presence of a proton acid catalyst while removing formed water.
摘要:
A process for producing geranylgeraniol is provided, which comprising the steps of subjecting a mixture of at least one ester derivative wherein one or more carbon-carbon double bonds in the molecule are in cis form represented by the general formula (1): ##STR1## wherein R represents an aromatic group which can be substituted with at least one substituent, or a higher aliphatic group having from 7 to 25 carbon atoms, and wavy lines, respectively, represent a state where each carbon-carbon double bond can be present in cis or trans form, and an ester derivative of the general formula (2): ##STR2## wherein R is as defined above, to crystallization to obtain the ester derivative of the formula (2) selectively, and hydrolyzing the thus obtained ester derivative.
摘要:
A process for producing vitamin A acid, having useful biological activity, which comprises oxidizing vitamin A aldehyde with an aqueous solution of an alkali metal chlorite in the presence of an acid.
摘要:
The present invention provides a cis-configurational unsaturated ester represented by the formula (1) ##STR1## (where R is a methyl group or a phenyl group, and n is 1 or 2) and also provides a fragrance composition containing the cis-configurational unsaturated ester in an effective amount. The cis-configurational unsaturated ester represented by the formula (1) can be produced byreacting a cyclic vinyl ether represented by the formula (2a) ##STR2## (where n is defined as above) with a Grignard reagent represented by the formula (3a)RMgX (3a)(where R is defined as above, and X is a chlorine atom, a bromine atom or an iodine atom)in the presence of a triarylphosphine and not more than 0.05 mol of a nickel compound per one mole of the cyclic vinyl ether represented by the formula (2a) to give a cis-configurational unsaturated alcohol represented by the formula (4a) ##STR3## (where n and R are defined as above); and subjecting this cis-configurational unsaturated alcohol to acylation with acetic acid or a derivative thereof to give the cis-configurational unsaturated esters represented by the formula (1).
摘要:
[Problem]The present invention provides an industrially advantageous production method of a 6-halogeno-3-arylpyridine derivative in which cryogenic condition is not required, production step is short, and an isomer difficult to be separated is not produced as a by-product,[Solution]A production method of a 6-halogeno-3-arylpyridine derivative represented by the general formula (III) comprising: the first step reacting a 2,5-dihalogenopyridine derivative represented by the general formula (I) with a magnesiation reagent; and the second step reacting the product obtained from the above-described first step, in the presence of a palladium compound, with a halogenoaryl derivative represented by the general formula (II).
摘要:
[Problem] The present invention provides an industrially advantageous production method of a 6-halogeno-3-arylpyridine derivative in which cryogenic condition is not required, production step is short, and an isomer difficult to be separated is not produced as a by-product,[Solution] A production method of a 6-halogeno-3-arylpyridine derivative represented by the general formula (III) comprising: the first step reacting a 2,5-dihalogenopyridine derivative represented by the general formula (I) with a magnesiation reagent; and the second step reacting the product obtained from the above-described first step, in the presence of a palladium compound, with a halogenoaryl derivative represented by the general formula (II).
摘要:
A video data processing apparatus includes a reading unit reading video data from a video data file recorded on a randomly accessible storage medium in response to a first control signal, and reading position data indicating a frame position of the video data in the video data file from the video data file recorded on the storage medium in response to a second control signal, a memory storing the position data read by the reading unit, and a controller controlling the reading unit by outputting the second control signal before the outputting of the first control signal, and controlling the reading unit by outputting the first control signal with a designation of particular video data to be read indicated by the position data stored in the memory, in response to a request to execute a process to the video data file.
摘要:
A telephone system comprising a plurality of phone devices and a plurality of information terminals for mutually communicating via a communication network, comprising position managing means for managing mutual position relations between the plurality of phone devices and the plurality of information terminals, and correlating means for mutually correlating at 1:1 between the plurality of phone devices and the plurality of information terminals on the basis of the managed position relations.
摘要:
A semiconductor memory device includes: a memory cell array including a plurality of memory cells arranged in rows and columns for holding information, each of the memory cells having a control gate; a plurality of word lines extending in a row direction, each of the word lines being connected to the control gates of the memory cells of a corresponding row of the memory cell array; a plurality of bit lines extending in a column direction and connected to sources or drains of the memory cells; a row decoder for selecting any of the plurality of word lines; a column decoder for selecting any of the plurality of bit lines; a charge pump circuit for generating a voltage higher than a supply voltage; and a first switch located in a connection path between the row decoder and the charge pump circuit.
摘要:
It is determined whether or not a transmitter has issued a request to display a completion state table, whether or not the current date and time have reached the date and time specified by the transmitter, whether or not an opening rate has exceeded a predetermined value, or whether or not a completion rate has exceeded a predetermined value. When any of these conditions is satisfied, a completion state table containing information such as the number of receivers who have opened the message, the opening rate, the number of receivers who have completed their jobs associated with the message, the completion rate, etc. is forcibly displayed on a terminal device.