摘要:
This invention discloses chemical compounds of the formula ##STR1## wherein X is halogen or trifluoromethyl; Y is selected from the group consisting of hydrogen, halogen, nitro and cyano; Z is selected from the group consisting of nitro, cyano and halogen; R.sup.1 is alkyl; R.sup.2 is hydrogen or alkyl; and R.sup.3 is furfuryl or tetrahydrofurfuryl. Further discussed are herbicidal compositions utilizing the aforedescribed compounds and methods of controlling undesired vegetation therewith.
摘要:
A process for the preparation of a tetrahydrofuran-3-aldehyde of the formula ##STR1## in which R.sup.1 is hydrogen, or an alkyl or phenyl radical, andR.sup.2 is an alkyl, (C.sub.1 -C.sub.4 -alkoxy)-carbonyl, (C.sub.1 -C.sub.4 -alkoxy) carbonylmethylene or phenyl radical, orR.sup.1 and R.sup.2 together are an alkanediyl radical,comprising heating a 4,5-dihydro-1,3-dioxepine of the formula ##STR2## at about 100.degree. to 250.degree. C. in the presence of a catalytic amount of o-toluic acid. Advantageously about 0.05 to 0.15 mole of o-toluic acid is used per mole of the dioxepine, and heating is effected between about 120.degree. and 200.degree. C. at a pressure up to about 10 bars. The compounds, some of which are new, are insecticidally and acaricidally active.
摘要:
Copolymerizable blocked isocyanate diols are prepared by reacting a blocking agent with an isocyanate group of an organic diisocyanate under controlled conditions, thereby forming a blocked isocyanate group, and reacting the second isocyanate group in a subsequent step with the amine portion of a selected amine diol under anhydrous conditions. The resultant products are used to prepare self-crosslinkable, linear polyurethanes of high molecular weight.
摘要:
In the cyclization of gamma-delta or delta-epsilon unsaturated alcohols in order to obtain certain tetrahydrofuran and tetrahydropyran derivatives which are useful in the perfuming of detergents, the improvement consisting in that the alcohol to be cyclized is reacted with a cationic ion-exchange resin. The useful temperature range is from 20.degree. C. to 150.degree. C.: in practice the alcohol and the resinare boiled together or refluxed until the reaction is completed. A number of examples is reported and physicochemical data are given.
摘要:
New derivatives of prostanoic acids are described as well as a process for their manufacture. The new compounds show valuable pharmacological activities and can be used for treating e.g. asthma bronchiale, high blood pressure and edema.
摘要:
This invention relates to therapeutically active 2,5-tetrahydrofurane derivatives, wherein the substituent in the 2-position is a group ROOC--(CH.sub.2).sub.7, in which R is hydrogen or lower alkyl, the 5-substituent being an alkyl or alkenyl group of 8 to 12 carbon atoms, which may be substituted with an oxygen atom, a hydroxy group or a lower alkyl group at the third carbon atom, counted from the furane ring, and to the production thereof.
摘要:
HERBICIDAL 4-CYANO-2,6-DIHALO-PHENYL CARBONATES OF THE FORMULA
1,3-DI(X-),2-(R-O-CO-O-),S-(NC-)BENZENE WHEREIN X IS BROMINE OR IODINE, AND R IS ALLYL, TETRAHYDROFURFURYL, PHENYL, HALOPHENYL, BENZYL,2,2,2-TRICHLOROETHYL OR 2-METHOXYETHYL.