摘要:
Compounds are prepared corresponding to the formula ##STR1## WHEREIN EACH R represents alkyl of 1 to 4 carbon atoms. These compounds can be employed as starting materials for preparing 3,4,5-trichloro-N,N-di(loweralkyl)-2-(thiomethylthiocyanato)benzenesulfonamides which are useful as antimicrobial agents.
摘要:
Compounds are prepared corresponding to the formula ##STR1## WHEREIN R represents hydrogen or methylenethiocyanate (--CH.sub.2 SCN) and each of R.sup.1 and R.sup.2 represents loweralkyl of 1 to 4 carbon atoms. Those compounds wherein R is methylenethiocyanate have been found to be active antimicrobial agents and those wherein R is hydrogen are useful as intermediates therefor.
摘要:
This invention concerns dibromo- and tribromomethanesulfonamides of the formula ##STR1## wherein ##STR2## is a heterocyclic ring which may contain oxygen as another hetero atom and may be substituted with 1 to 2 lower alkyl groups, and x is 2 or 3. The compounds have antimicrobial activity.
摘要:
The disclosed invention comprises a compound having the formula: in which R1 and R2 independently represent a hydrogen or an alkyl group of 4 carbon atoms or greater. Further disclosed is a process for the preparation of the disclosed chiral amino alcohols from a starting amine compound and a limonene oxide.
摘要:
A process for separating enantiomeric mixtures by liquid chromatography using a stationary phase that includes cellulose or amylose derivative and a mobile phase that includes methanol and pentane, the concentration of methanol in the mobile phase being greater than one tenth percent by volume and less than the saturation concentration of methanol in the mobile phase, the concentration of pentane being at least that necessary to resolve the enantiomeric mixture into its enantiomers with a resolution at least one and one half times greater than the pentane of the mobile phase is replaced with hexane.
摘要:
The present invention relates to novel, powerful reducing agents, lithium aminoborohydrides which are prepared by addition of BH.sub.3 .cndot.THF to the corresponding dialkylamine at 25.degree. C. to give the intermediate amineborane complex. Subsequent deprotonation by strong base, e.g. n-BuLi, yields the aminoborohydride quantitatively. Lithium aminoborohydrides are powerful reducing agents, comparable in strength to lithium aluminum hydride. The activity is determined by the dialkylamine. Lithium pyrrolidinoborohydride has unique activity and selectivity in its reducing properties. Esters, lactones and anhydrides are reduced cleanly at 25.degree. C. to give the corresponding alcohols, while carboxylic acids are not reduced. Test reductions show that lithium pyrrolidinoborohydride is also capable of reducing a wide range of functional groups including amides, epoxides, oximes, nitriles and halides.
摘要:
3-(2-Thiophenesulfonyl)-2-halopropanenitriles of the formula ##STR1## wherein R is H, C.sub.1-4 alkyl, Br or Cl and X is Br or Cl. The compounds have antimicrobial utility.
摘要:
The compound of this invention is prepared by reacting phenol as such or as its alkali metal phenate with dichlorodifluoroethylene to form 2,2-dichloro-1,1-difluoroethoxybenzene and reacting the latter with chlorosulfonic acid and recovering the reaction product. The compound of this invention, when reacted with acrylonitrile gives the antimicrobial compound, 2-chloro-3-(4-(2,2-dichloro-1,1-difluoroethoxy)phenyl)sulfonyl)propanenitrile.
摘要:
Novel compounds, i.e. 3,5-bis(chloromethylthio)-4-cyanoisothiazole; 2,5-bis(chloromethylthio)-1,3,4-thiadiazole; and 3,5-bis(chloromethylthio)-1,2,4-thiadiazole are prepared by reacting an alkali metal aryl mercaptide with bromochloromethane in the presence of a quaternary ammonium salt. These novel compounds have microbiological activity and are also useful as intermediates in the preparation of the corresponding thiocyanomethylthio compounds which have antimicrobial activity.
摘要:
Quinolinesulfonyl hydrazine and quinolinesulfonyl bromide compounds of the formula ##STR1## wherein R is either a bromine radical or a hydrazine radical. The quinolinesulfonyl hydrazine compounds are useful as intermediates for making quinolinesulfonyl bromide compounds, the latter being useful as antimicrobials.