摘要:
A process for the preparation of 2-chloro-5-methylpyridine of the formula ##STR1## which comprises reacting 3-methyl-pyridine-1-oxide of the formula ##STR2## with a chlorinating agent of the formula ##STR3## in which R.sup.1 represents alkyl, halogenoalkyl, cycloalkyl, optionally substituted aryl, NR.sup.2 R.sup.3 or OR.sup.4 in whichR.sup.2 and R.sup.3 individually represent alkyl, cycloalkyl or aryl or together represent alkanediyl or oxaalkanediyl andR.sup.4 represents alkyl, cycloalkyl or optionally substituted aryl,in the presence of a basic organic nitrogen compound and in the presence of a diluent at a temperature between about -20.degree. C. and +150.degree. C.
摘要:
A process for the preparation of 2-chloro-5-chloromethylpyridine of the formula (I) ##STR1## which is used as an intermediate for the preparation of insecticides, the process comprising (a) reacting in a first step nicotinic acid of the formula (II) ##STR2## with phosphorus pentachloride, if appropriate in the presence of thionyl chloride and if appropriate in the presence of a diluent, (b) reacting in a second step the resulting 3-trichloromethylpyridine from the first step, of the formula III, ##STR3## with an alkali metal alkoxide of the formual (IV)R--O--M (IV)in whichR represents alkyl andM represents an alkali metal cation,if appropriate in the presence of a diluent, (c) reacting in a third step the resulting pyridine ether acetal from the second step, of the formula (V), ##STR4## in which R has the abovementioned meaning with water, if appropriate in the presence of a catalyst acid, (d) hydrogenating in a fourth step the resulting pyridine aldehyde from the third step, of the formula (VI), ##STR5## in which R has the abovementioned meaning with molecular hydrogen in the presence of a hydrogenation catalyst and, if appropriate, in the presence of a diluent, and, finally, (e) reacting in a fifth step the resulting pyridylmethanol from the fourth step of the formula (VII), ##STR6## in which R has the abovementioned meaning.
摘要:
Herbicidal triazolodihydropyrimidine-2-sulphonamides of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 independently of one another each stand for hydrogen or for optionally substituted alkyl andR.sup.4 stands for in each case optionally substituted aryl or heteroaryl.
摘要:
A process for the preparation of 2-chloro-5-chloromethyl-pyridine of the formula ##STR1## which comprises reacting nicotinic acid of the formula ##STR2## with phosphorus pentachloride to produce 3-trichloromethylpyridine of the formula ##STR3## reacting the 3-trichloromethylpyridine in a 2nd step with an alkali metal alkoxide of the formulaR-O-M (IV)in whichR represents alkyl andM represaents an alkali metal cation, to produce a pyridine ether acetal of the formula ##STR4## reacting the pyridine ether acetal in a 3rd step with dilute aqueous acid to produce pyridone aldehyde of the formula ##STR5## hydrogenating the pyridone aldehyde in a 4th step with molecular hydrogen in the presence of a hydrogenation catalyst to produce the pyridylmethanol compound of the formula ##STR6## and reducing the pyridylmethanol compound in a 5th step with a chlorinating agent.
摘要:
Microbicidal substituted pyrazolin-5-ones of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another each represent hydrogen, alkyl, alkenyl, alkinyl, cyanoalkyl, hydroxyalkyl, alkoxyalkyl, alkylthioalkyl, alkoxycarbonyl, hydroxycarbonylalkyl, alkoxycarbonylalkyl, aminocarbonylalkyl, alkylaminocarbonylalkyl or dialkylaminocarbonylalkyl, or represent in each case optionally substituted oxiranylalkyl, aralkyl, heterocyclyl or aryl andHet represents an optionally substituted heterocyclic radical.Intermediates therefor of the formula ##STR2## in which R is alkyl, are also disclosed.
摘要:
Fungicidally active substituted pyrazolin-5-ones of the formula ##STR1## in which R.sup.1 is hydrogen or alkyl,R.sup.2 is hydrogen, alkyl, alkenyl, alkinyl, cyanoalkyl, hydroxyalkyl, alkoxyalkyl, hydroxycarbonylalkyl or alkoxycarbonylalkyl, aminocarbonylalkyl, alkylaminocarbonylalkyl or dialkylaminocarbonylalkyl, or in each case optionally substituted oxiranylmethyl, aralkyl or aryl, andR.sup.3 is alkyl, alkenyl, alkinyl, cyanoalkyl, hydroxyalkyl, alkoxyalkyl, hydroxycarbonylalkyl, alkoxycarbonylalkyl, cycloalkyl or cycloalkylalkyl, or in each case optionally substituted aralkyl, aryloxyalkyl or arylthioalkyl, but wherein R.sup.3 is methyl or ethyl only if R.sup.1 and/or R.sup.2 is not hydrogen or methyl.