Paclobutrazol

  • 1H-1,2,4-Triazole-1-ethanol, b-[(4-chlorophenyl)methyl]-a-(1,1-dimethylethyl)-, (R*,R*)-(+-)-
Formula
C15H20ClN3O
Structure
Description
Off-white to beige solid..
Uses
Plant growth regulator.

Registry Numbers and Inventories.
CAS
76738-62-0
RTECS
XZ4803300
Merck
12,7118
Beilstein/Gmelin
8153382
EPA OPP
125601
Swiss Giftliste 1
G-85448
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C15H20ClN3O
Formula mass
293.8
Melting point, °C
165
Boiling point, °C
461
Vapor pressure, mmHg
2.7E-9 (25 C)
Density
1.19 g/cm3
Solubility in water
26 mg/L (20 C)
pKa/pKb
11.68 (pKa)
Partition coefficient, pKow
2.99
Heat of vaporization
76.04 kJ/mol

Hazards and Protection.
Storage
Store the material in a well-ventilated, secure area out of reach of children and domestic animals. Do not store food, beverages or tobacco products in the storage area.
Protection
Chemical safety goggles, impervious gloves (nitrile or butyl) and protective work clothing.
Respirators
A NIOSH-certified combination air-purifying respirator with an N, P or R 95 or HE class filter and an organic vapor cartridge may be permissible under certain circumstances where airborne concentrations are expected to exceed exposure limits. Protection provided by air-purifying respirators is limited. Use a pressure demand atmosphere-supplying respirator if there is any potential for uncontrolled release, exposure levels are not known, or under any other circumstances where air-purifying respirators may not provide adequate protection.
Small spills/leaks
If a solid, sweep up material and place in a compatible disposal container. If a liquid, cover entire spill with absorbing material and place into compatible disposal container. Scrub area with hard water detergent.
Stability
Stable under normal storage conditions.
Incompatibilities
Oxidizing agents.
Decomposition
Will form toxic fumes and high temperature.

Fire.
Flash Point,°C
233
Fire fighting
Use dry chemical, foam or CO2 extinguishing media. Wear full protective clothing and self-contained breathing apparatus. Evacuate nonessential personnel from the area to prevent human exposure to fire, smoke, fumes or products of combustion. Prevent use of contaminated buildings, area, and equipment until decontaminated. Water runoff can cause environmental damage. If water is used to fight fire, dike and collect runoff.
Combustion products
During a fire, irritating and possibly toxic gases may be generated by thermal decomposition or combustion.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Harmful if inhaled or swallowed. Dust, mist or vapor irritating to eyes and respiratory tract. May cause skin irritation.

First aid
 
   Ingestion
If swallowed, induce vomiting immediately as directed by medical doctor. Do not give anything by mouth to an unconscious person.
   Inhalation
If inhaled: Move person to fresh air. Call doctor for further treatment advice if effects occur.
   Skin
Wash off in flowing water or shower.
   Eyes
If in eyes: Hold eye open and rinse slowly and gently with water for 15-20 minutes. Remove contact lenses, if present, after 5 minutes, then continue rinsing eye. Call a poison control center or doctor for treatment advice.

Transport.