Abstract:
A process for producing 6-dimethylaminomethyl-1-(3-hydroxy- or 3-C1-C4 alkoxyphenyl)-cyclohexane-1,3-diols from 6-dimethylaminomethyl-1-hydroxy-1-(3-hydroxy- or 3-C1-C4 alkoxyphenyl)-cyclohexane-3-ones by catalytic hydrogenation in the presence of heterogeneous or homogeneous catalysts, or by using metal hydrides.
Abstract:
A process for producing 6-dimethylaminomethyl-1-(3-hydroxy- or 3-C1-C4 alkoxyphenyl)-cyclohexane-1,3-diols from 6-dimethylaminomethyl-1-hydroxy-1-(3-hydroxy- or 3-C1-C4 alkoxyphenyl)-cyclohexane-3-ones by catalytic hydrogenation in the presence of heterogeneous or homogeneous catalysts, or by using metal hydrides.
Abstract:
The invention is directed to a process for the preparation of α,β-unsaturated acids, esters and amides from α- or β-hydroxycarboxylic acids or esters or precursors in high yields and high selectivity. The α,β-unsaturated acids or esters are optionally prepared in the presence of specific dehydration and/or esterification catalysts. The α,β-unsaturated amides or substituted amides are prepared optionally in the presence of a dehydration and/or amidation catalyst. The source of α- or β-hydroxycarboxylic acids or precusor is preferably from a renewable resource. The precursor is defined herein.
Abstract:
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.
Abstract:
(3-Fluoropyridin-2-yloxy)phenoxypropionic acids of formula I ##STR1## wherein X is hydrogen, fluoro, chloro, bromo or trifluoromethyl and Y is hydrogen, sodium or potassium, are prepared by reacting a compound of formula II ##STR2## wherein X and Y are as defined for formula I, in an anhydrous mixture of hydrogen fluoride, dimethylsulfoxide and a diazotising agent under normal pressure, and converting the diazonium fluoride so produced by thermal decomposition into the (3-fluoropyridin-2-yloxy)phenoxypropionic acid of formula I.
Abstract:
There is disclosed a multi-step process for the preparation of benzenesulfonamides of general formula ##STR1## wherein R is 3,3-difluorobutyl or 3,3-difluorobuten-1-yl. The benzenesulfonamides obtainable by the process of the invention are intermediates for the synthesis of herbicidally active sulfonyl ureas.
Abstract:
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.
Abstract:
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.
Abstract:
The invention is directed to a process for the preparation of α,β-unsaturated acids, esters and amides from α- or β-hydroxycarboxylic acids or esters or precursors in high yields and high selectivity. The α,β-unsaturated acids or esters are optionally prepared in the presence of specific dehydration and/or esterification catalysts. The α,β-unsaturated amides or substituted amides are prepared optionally in the presence of a dehydration and/or amidation catalyst. The source of α- or β-hydroxycarboxylic acids or precusor is preferably from a renewable resource. The precursor is defined herein.
Abstract:
Novel substituted N-benzoyl-N'-2,5-dihalo-4-perfluoroalkoxyphenylureas of formula I ##STR1## in which R.sub.1 is hydrogen, fluorine, chlorine or bromine; R.sub.2 is fluorine or chlorine; each of R.sub.3 and R.sub.4 is fluorine, chlorine or bromine; and n is 2, 3, 4, 5, 6, 7 or 8, processes and intermediates for their prepraration, their use in pest control, and pesticidal compositions that contain at least one compound of formula I as active ingredient, are disclosed. The preferred field of application is the control of pests in and on animals and plants.