摘要:
The present invention relates to a hydrogenation process for the preparation of aromatic amino compounds containing directly on the aryl ring or in a side chain one or more entities that may also undergo hydrogenation, such as carbon multiple bonds, nitrile groups, imino groups or carbonyl groups. The preparation is carried out by catalytic hydrogenation of the corresponding aromatic nitro compounds in the presence of a phosphorus-modified noble metal catalyst. The invention relates also to the use of modified noble metal catalysts for the hydrogenation of aromatic nitro compounds containing carbon multiple bonds and/or substituted by nitrile, imino or carbonyl groups.
摘要:
The present invention relates to a hydrogenation process for the production of aromatic halogen-amino compounds by means of catalytic hydrogenation on noble metal catalysts of corresponding aromatic halonitro compounds, characterised in that a rhodium, ruthenium, iridium, platinum or palladium catalyst which is modified with an inorganic or organic phosphorus compound with a degree of oxidation of less than V, is used, in the presence of a vanadium compound.
摘要:
The present invention relates to a hydrogenation process for the production of aromatic halogen-amino compounds by means of catalytic hydrogenation on noble metal catalysts of corresponding aromatic halonitro compounds, characterised in that a rhodium, ruthenium, iridium, platinum or palladium catalyst which is modified with an inorganic or organic phosphorus compound with a degree of oxidation of less than V, is used, in the presence of a vanadium compound.
摘要:
The present invention relates to a process for the preparation of aromatic amino compounds which are substituted by a least one group comprising at least one unsaturated carbon-carbon bond, by catalytic hydrogenation of corresponding aromatic nitro compounds in the presence of a modified noble metal catalyst, wherein the noble metal catalyst used is platinum modified with a metal selected from the group consisting of lead, mercury, bismuth, germanium, cadmium, arsenic, antimony, silver and gold, and to novel noble metal catalysts for use in this process.
摘要:
The invention relates to processes for preparing substituted aromatic amino compounds which contain at least one unsaturated --CN bond or carbonyl group on the aromatic radical or in a side chain, by catalytic hydrogenation of appropriate substituted aromatic nitro compounds in the presence of a modified noble metal catalyst of platinum which is modified with a metal selected from lead, mercury, bismuth, germanium, cadmium, arsenic, antimony, silver and gold.
摘要:
In accordance with a novel process, 2,3-difluoropyridines of formula I ##STR1## wherein X is halogen or trifluoromethyl, are prepared by diazotising a 3-amino-2-halopyridine of formula II ##STR2## wherein X is as defined for formula I and Y is bromine, chlorine or fluorine, in the presence of hydrogen fluroide, to give a 3-fluoro-2-halopyridine of formula III ##STR3## wherein X and Y are as defined for formula II, and treating resultant 3-fluoro-2-halopyridines of formula III, wherein Y is bromine or chlorine, with a fluorinating agent.The 2,3-difluoropyridines prepared by the novel process are valuable intermediates for the preparation of 2-[4-(3-fluoropyridin-2-yloxy)-phenoxy]propionic acid derivatives which are known as herbicides.
摘要:
The present invention relates to a novel process for the preparation of an .alpha.,.alpha.-difluoroalkyl phenyl ether of formula I ##STR1## wherein R.sup.1 is hydrogen, halogen, amino, nitro, --SO.sub.2 --R.sup.4, --S--R.sup.5, --SO--R.sup.6 or --S--S--R.sup.7,R.sup.2 is hydrogen, halogen, nitro, hydroxy or --SO.sub.2 --R.sup.8,R.sup.3 is C.sub.1 -C.sub.5 haloalkyl,X is oxygen, sulfur, --SO-- or --SO.sub.2 --,R.sup.4 is hydroxy, halogen, amino, --N.dbd.C.dbd.O, --NH--CO--Cl, --NH--CO--Br, --NR.sup.9 R.sup.10, benzyl, phenyl, C.sub.1 -C.sub.4 alkyl or --NH'CO--NR.sup.11 R.sup.12,R.sup.5 and R.sup.6 are C.sub.1 -C.sub.4 alkyl, phenyl or benzyl,R.sup.7 is C.sub.1 -C.sub.4 alkyl, phenyl or benzyl,R.sup.8 is hydroxy or halogen,R.sup.9 and R.sup.10 are each independently of the other C.sub.1 -C.sub.4 alkyl or benzyl andR.sup.11 and R.sup.12 are each independently of the other hydrogen, C.sub.1 -C.sub.4 alkyl, phenyl or an aromatic heterocycle,which process comprises fluorinating a compound of formula II ##STR2## wherein R.sup.1 R.sup.2, R.sup.3 and X are as defined for formula I, with hydrogen fluoride, in the presence of a catalytic amount of an antimony(V) compound. The intermediate of formula III ##STR3## obtained when carrying out said process may, if desired, be isolated by selecting suitable reaction conditions.
摘要:
A process for the production of compounds useful as fluorescent whitening agents of formula: ##STR1## in which X and Y, are as defined herein and n is 1 or 2, comprises A) diazotising one mole of an amine of formula: ##STR2## (2A) to produce a diazonium compound of the formula: ##STR3## (2) in which G.sub.1 is a counter ion; and diazotising one mole of an amine of formula: ##STR4## (3A) to produce a diazonium compound having the formula: ##STR5## (3); and B) reacting one mole of a divinyl compound having the formula: ##STR6## (4) with one mole of a compound having the formula (2) and with one mole of a compound having the formula (3), in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor.
摘要:
1-[2-(2,4-Dichlorophenyl)-pentyl]-1H-1,2,4-triazole can be produced, in a novel, simple, economical and isomer-free form, by reacting 2-(2,4-dichlorophenyl)-valeronitrile, in the presence of hydrogen, an acid and a hydrogenation catalyst, with a compound H.sub.2 N--NH--R to a compound of the formula ##STR1## hydrogenating the compound (III) catalytically to a compound ##STR2## hydrolysing compounds (IV) wherein R is not hydrogen, and converting the compounds (IV) wherein R=H, or salts thereof, with formamide and/or [3-(dimethylamino)-2-azaprop-2-en-1-ylidene]-dimethylammonium chloride, into 1-[2-(2,4-dichlorophenyl)-pentyl]-1H-1,2,4-triazole, or converting compounds (IV) wherein R=--COR', with aqueous formic acid, into the corresponding N,N'-bisformyl derivatives, and reacting these with formamide, optionally in the presence of NH.sub.3, to 1-[2-(2,4-dichlorophenyl)-pentyl]-1H-1,2,4-triazole. R in the formulae is hydrogen, --CHO, --COR', --COOR' or --CONH.sub.2, and R' is C.sub.1 -C.sub.4 -alkyl, benzyl or phenyl.1-[2-(2,4-Dichlorophenyl)-pentyl]-1H-1,2,4-triazole exhibits fungicidal activity, and can be used to control phytopathogenic fungi.
摘要:
An apparatus for supporting a parachute flight controller from a parachute comprises a bearing member, for example a pulley, a load-bearing coupling, for example a harness, connected to the bearing member and including a connector for connecting the coupling to a parachute flight controller. The coupling includes a load-bearing connector for connecting a payload thereto, and the bearing member is adapted to enable relative movement, controlled by the flight controller, between the bearing member and a support member, for example a flexible coupling line or web for supporting the bearing member connected between first and second suspension lines of a parachute. The flight controller may include one or more control lines connected to the support member or suspension lines which can be wound in or out of the flight controller to effect relative movement between the bearing member and the support member and thereby control the direction of the parachute.