摘要:
Malononitrile is obtained for the first time from its reaction gas mixture obtained by reacting acetonitrile and cyanogen chloride by partial condensation in decreasing temperature steps, namely while avoiding contact with the simultaneously formed hydrogen chloride.
摘要:
4-amino-6-tert.butyl-3-mercapto-1,2,4-triazin-5-one of the formula ##STR1## is produced by reacting pivaloyl cyanide and isobutylene in the presence of acetic acid and sulfuric acid, hydrolyzing the reaction mixture in the presence of water and reacting the trimethyl pyruvic acid formed with thiocarbohydrazide. The triazinone is an important intermediate product in the synthesis of the known herbicide 4-amino-6-tert.butyl-3-methylmercapto-1,2,4-triazin-5-one.
摘要:
There are prepared compounds of the formula ##STR1## where >A--B-- has either the structure >C(OH)--CH.sub.2 -- or the structure >C.dbd.CH, Alk is a straight or branched chain C.sub.1 --C.sub.5 --alkylene group and Y is ##STR2## where R is hydrogen or a C.sub.1 --C.sub.4 --alkyl group and T is hydrogen or a C.sub.2 --C.sub.6 --alkanoyl group ##STR3## where R' is hydrogen, phenyl, phenyl substituted once or twice. The compounds are effective in improving peripheral and cerebral circulation. There are also produced intermediate compounds of formula (II) where NHY is replaced by chlorine, bromine or iodine.
摘要:
2-acetamidocinnamic acid and substituted 2-acetamidocinnamic acids are prepared by reacting glycine with an aromtic aldehyde in the presence of acetic anhydride and a tertiary amine and subsequently treating with water.
摘要:
Aliphatic, cycloaliphatic and aromatic epoxides are reacted with ketone cyanohydrins of the formula ##STR1## wherein R.sub.1 and R.sub.2 are aliphatic groups of 1 to 4 carbon atoms at 20.degree. to 150.degree. C. to produce hydroxynitriles. The reaction optionally can be carried out in an inert organic solvent.
摘要:
A method of combating undesired plant growth in cereals, in particular winter cereals such as wheat and barley, which comprises treating the locus of the cereals with an effective amount of one or more compounds of formula I: in which R1, R2 and X—W have the meaning given in the claims.
摘要:
The invention relates to novel compounds of formula I: wherein R1 through R5, A, X and Z have the meaning set forth in the description. Furthermore the invention relates to a process for the preparation of the novel compounds of formula I, to a novel pyrazol-5-ylboronic acid of formula V, which is used in said process wherein R3 through R5 have the meaning set forth in the description and to a herbicidal composition containing such compounds as active ingredients
摘要:
New herbicidal pyridine and pyrimidine derivatives of general formula (I), ##STR1## wherein Z represents a nitrogen atom or a C--H group; A represents an optionally substituted aryl group or an optionally substituted 5- or 6-membered nitrogen-containing heteroaromatic group; n represents an integer from 0 to 2 and R.sup.1 or each R.sup.1 independently represents a hydrogen atom or an optionally substituted alkyl, alkoxy, alkylthio or dialkylamino group; m represents an integer from 0 to 5 and R.sup.2 or each R.sup.2 independently represents a hydrogen or a halogen atom or an optionally substituted alkyl, haloalkyl, haloalkoxy, alkoxy, alkylthio group or a nitro, cyano or a halosulphonyl group; and X represents an oxygen or sulphur atom.
摘要:
There are provided substituted pyridine compounds having the structural formula I ##STR1## Further provided are compositions and methods comprising those compounds for the control of undesirable plant species.
摘要:
There are provided substituted pyridine compounds having the structural formula I ##STR1## Further provided are compositions and methods comprising those compounds for the control of undesirable plant species.