Barban

  • Barbane
  • Carbyne
  • NSC 29168
  • CBN
  • 2-Butynyl-4-chloro-m-chlorocarbanilate
  • Carbamic acid, (3-chlorophenyl)-, 4-chloro-2-butynyl ester
Formula
C11H9Cl2NO2
Structure
Description
Crystalline solid.
Uses
Selective post-emergence herbicide former use.

Registry Numbers and Inventories.
CAS
101-27-9
EC (EINECS/ELINCS)
202-930-4
EC Index Number
006-020-00-6
EC Class
Harmful; Sensitising; Dangerous for the Environment
RTECS
FD7700000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
Merck
12,986
Beilstein/Gmelin
2376181
Beilstein Reference
4-12-00-01149
RCRA
U280
EPA OPP
17601
Swiss Giftliste 1
G-1205
Austrailia AICS
Listed

Properties.
Formula
C11H9Cl2NO2
Formula mass
258.1
Melting point, °C
100.16
Vapor pressure, mmHg
4E-7 (25 C)
Density
1.403 g/cm3 (25 C)
Solubility in water
Insoluble
pKa/pKb
10.01 (pKa)

Hazards and Protection.
Storage
Aluminum, phenolic-lined cans, or glass are recommended for lengthly storage. Do not store near or contaminate feed or foodstuffs. Do not store near heat or open flame.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Possible allergic reaction in man by skin contact should be avoided by the use of plastic protective clothing.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
Storage @ alternating temperature of 50 to -15 C for 6 mo had no adverse effects on emulsion performance.
Incompatibilities
Strong oxidizing agents.

Fire.
Flash Point,°C
81
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Health.
Poison_Class
4
Exposure effects
Exposure to thiram or mbdt-carb (based on animal studies) may cause weakness, ataxia, ascending paralysis and hypothermia. Peripheral neuropathy (pain, numbness and weakness of the extremities) has been noted following exposure to thiuram (the ethyl analog of thiram). No adverse reproductive effects (testicular parameters) in male mice were observed following methyl thiophanate doses up to 1000 mg/kg orally for 5 consecutive days (Traina et al, 1998). Maternal toxicity was evident in female rats.
   Ingestion
Nausea, vomiting and diarrhea may occur.
   Inhalation
Respiratory failure, requiring ventilatory support, has been reported following ingestions.
   Skin
Exposure to dusts, sprays, solutions, wettable powder suspensions or emulsions of these agents may lead to skin and mucous membrane irritation.

First aid
 
   Ingestion
Ipecac-induced vomiting is not recommended because of the potential for cns depression and seizures. Consider after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion (generally within 1 hour). Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents. Intravenous fluids may be useful in restoring extracellular fluid volume following severe vomiting and diarrhea.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
If symptoms develop, immediately move individual away from exposure and into fresh air. Flush eyes gently with water for at least 15 minutes while holding eyelids apart; seek immediate medical attention.

Transport.