BARBAN

Chemical properties

Crystalline solid; melts at 75°C (167°F);insoluble in water [11 mg/L at 25°C (77°F)];slightly soluble in hexane; soluble in benzeneand chlorinated hydrocarbons.

Chemical properties

Whitecrystallinesolid;meltsat75°C(167°F);insoluble in water, dissolves in benzene,toluene, and ethylene dichloride; hydrolyzedby acids and alkalies; alkaline hydrolysis liberates terminal chlorine atom.

The Uses of BARBAN

Barban is used as a selective herbicide forwild oats.

The Uses of BARBAN

Selective herbicide for wild oats.

Definition

ChEBI: A carbamate ester that is 4-chlorobut-2-yn-1-yl ester of N-(3-chlorophenyl)carbamic acid. A herbicide, it is no longer approved for use within the European Community.

General Description

Crystalline solid. Water solubility is 11 ppm at 20°C. Used as a selective herbicide.

Air & Water Reactions

Hydrolyzed by strong acid or base.

Reactivity Profile

BARBAN is a carbamate ester. Carbamates are chemically similar to, but more reactive than amides. Like amides they form polymers such as polyurethane resins. Carbamates are incompatible with strong acids and bases, and especially incompatible with strong reducing agents such as hydrides. Flammable gaseous hydrogen is produced by the combination of active metals or nitrides with carbamates. Strongly oxidizing acids, peroxides, and hydroperoxides are incompatible with carbamates.

Health Hazard

Moderately toxic by ingestion and inhalation;absorption through skin may be very slowand, therefore, almost nontoxic by dermalroute; used as a herbicide, rather than as apesticide; toxic symptoms are those of othercarbamate esters;
LD50 oral (rat): 600 mg/kg
LD50 skin (rabbit): >20,000 mg/kg.