摘要:
Process for preparing chlorinated ethylenic derivatives of the formula ##STR1## in which R.sub.1 represents acetyl, formyl optionally in the form of an acetal, hydroxy optionally as an ether or ester, alkyloxycarbonyl, alkyl of 1 to 12 carbon atoms substituted by one or more acetyl, formyl optionally in the form of an acetal, hydroxy optionally in the form of an ether or ester, or alkyloxycarbonyl, alkenyl of 2 to 12 carbon atoms containing one or more double bonds optionally substituted by one or more of acetyl, formyl optionally in the form of an acetal, hydroxy optionally in the form of an ether or ester, or alkyloxycarbonyl, or R.sub.1 represents 3-sulpholenyl or a radical of formula ##STR2## in which R.sub.2 denotes a hydrogen or acetyl, by reacting chlorine in a nonpolar aprotic solvent with a compound of general formula ##STR3## in which R.sub.1 is defined as above. The products of formula I, some of which are new, are useful as intermediates in the synthesis of terpene products such as vitamin E.
摘要:
Compounds halogenated in the .alpha.-position to an electron-attracting group of formula ##STR1## in which X denotes a halogen atom, R denotes a hydrogen atom or a hydrocarbon radical or a radical --(CH.sub.2).sub.3 --COOR.sub.1 and Z denotes a radical --CHO, --COR.sub.2, --COOR.sub.3, --CONR.sub.4 R.sub.5, --CN, --SO.sub.2 R.sub.6, --NO.sub.2, --CO--(CH.sub.2)p--COO.sub.1 or --COO(CH.sub.2)p--COOR.sub.1 are made by a halogenating deacylation of a compound of formula ##STR2## in which R' denotes a hydrogen atom or a hydrocarbon radical, R" denotes a methyl radical and Z' denotes a radical --CHO, --COR.sub.2, --COOR.sub.3, --CONR.sub.4 R.sub.5, --CN, --SO.sub.2 R.sub.6 or --NO.sub.2 or R' and R" may form a radical --(CH.sub.2)-- or R' and R" may form a radical --CO--(CH.sub.2)p-- or --COO(CH.sub.2)p--, using an alkali metal alcoholate or an alkali or alkaline-earth metal carbonate and a halogenating agent.
摘要:
The new tetraene of formula: ##STR1## is useful particularly as an intermediate in the synthesis of, for example, hexahydropseudoionone, pseudoionone and vitamin A.It may be made by dehydrochlorinating 3-chloro-2-methyl-6-methylene-1,3,7-octadiene in the presence of a palladium catalyst and an inorganic base.
摘要:
Compounds of formula ##STR1## in which n denotes an integer from 1 to 10 and X and Y, which are identical or different, each denote an electron-attracting group, are made by reacting a halogenating agent with a compound of formula ##STR2## in which R, X and Y are as hereinbefore defined, anionized by a base.
摘要:
Substituted phenols of formula ##STR1## in which R.sub.1 is in an ortho or para position relative to the phenol function and denotes ##STR2## R.sub.2 denotes an acyclic radical optionally substituted by alkyl, hydroxy, alkoxycarbonyl, cyano or formyl, or a phenyl or naphthyl radical, and R denotes hydrogen or 1 to 4 substituents chosen from halogen, OH optionally in the form of ether or ester, alkyl, NO.sub.2, CHO optionally in the form of acetal, CH.sub.3 CO--, C.sub.6 H.sub.5 CO--, NH.sub.2, alkylamino, dialkylamino or alkoxycarbonyl, it being understood that 2 symbols R may form with the phenyl nucleus a condensed aromatic ring, which comprises reacting a butadiene of formula ##STR3## with a phenol for formula ##STR4## in water in the presence of a rhodium-based catalyst, a water-soluble phosphine and optionally an inorganic or organic base. The products of formula (I) are intermediates for the synthesis of vitamin E, antioxidants, perfumes or insecticides.
摘要:
Acetylenic derivatives of general formula ##STR1## in which R.sub.1 denotes a hydrogen atom or a phenyl radical or a radical of general formula ##STR2## in which R.sub.2 and R.sub.3, which may be identical or different, denote a hydrogen atom or a saturated or unsaturated aliphatic radical, substituted if appropriate, or form together a cycloaliphatic radical, R.sub.4 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical, a hydroxy, alkyloxy, methanesulphonyloxy, benzenesulpnonyloxy or p-toluenesulphonyloxy radical, R.sub.5 denotes a hydrogen atom or a saturated aliphatic radical, R.sub.6 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical are made by reaction of an acetylenic derivative of general formulaR.sub.1 --C.tbd.C--H (III)with an allyl derivative of general formula ##STR3## in the presence of a cuprous salt and an anhydrous organic base. The compounds of formula (I) are useful in organic synthesis, in particular in the preparation of the vitamins A and E.
摘要:
Unsaturated compounds of the formula: ##STR1## in which: Q denotes alkyloxycarbonyl, cyano or formyl, R.sub.1 denotes a saturated or unsaturated aliphatic radical, R.sub.2 denotes a hydrogen atom or an alkyl radical, R.sub.3 denotes a hydrogen atom or an aliphatic radical and R.sub.4 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical which may be substituted, are useful as intermediates in the synthesis of vitamin E.
摘要:
Unsaturated compounds of the formula: ##STR1## in which: Q denotes alkyloxycarbonyl, cyano or formyl, R.sub.1 denotes a saturated or unsaturated aliphatic radical, R.sub.2 denotes a hydrogen atom or an alkyl radical, R.sub.3 denotes a hydrogen atom or an aliphatic radical and R.sub.4 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical which may be substituted, are useful as intermediates in the synthesis of vitamin E.
摘要:
A method for establishing a communication channel between a local server and a remote server includes: i) transmitting, from the local server to a terminal, the IP address of the remote server and a communication port of the local server; ii) transmitting the IP address of the terminal from the terminal to the local server; iii) transmitting, from the local server to the terminal, a request to connect to the remote server, including the IP addresses of the remote server and the terminal, an identifier of the local server; and the communication port; iv) transmitting, from the local server to the remote server, the IP address of the terminal, an identifier of the local server, and the communication port; and v) combining, at the remote server, the identifier of the local server and the IP address of the terminal to ascertain an IP address of the local server.
摘要:
A process for removing from a mixture of isoprene trimers compounds of the formula ##STR1## by reacting a mixture of cyclic and linear trimers with a compound having an activated carbon atom, of the formula:X--CH.sub.2 --Yin which one of X or Y is an electron-withdrawing group and the other is an electron-withdrawing or electron-donating group, in the presence of a catalyst consisting of a water-soluble phosphine and a rhodium compound, the reaction being carried out in water or in a water-alcohol medium, and separating the cyclic trimers and linear trimers containing the chain ##STR2## from the mixture of products of the formulae: ##STR3## which can be used, in particular, in the synthesis of vitamin E.