ALLYL BROMIDE

PRODUCT IDENTIFICATION
CAS NO. 106-95-6

ALLYL BROMIDE
EINECS NO. 203-446-6
FORMULA CH2=CHCH2Br
MOL WT. 120.99
H.S. CODE 2903.30
TOXICITY Oral rat LD50: 120 mg/kg
SYNONYMS 3－溴丙烯; 3-Bromopropene; 3-Bromopropylene;
3-Bromo-1-propene; Bromoallylene; 2-Propenyl bromide;
SMILES 
 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE

clear to light yellow liquid
MELTING POINT

-119 C
BOILING POINT 71 C
SPECIFIC GRAVITY 1.40
SOLUBILITY IN WATER

very slight soluble

pH

 
AUTOIGNITION 280 C
VAPOR DENSITY 4.2
NFPA RATINGS Health: 3; Flammability: 3; Reactivity: 1
FLASH POINT

-2 - -1 C
STABILITY Stable under ordinary conditions. light sensitive

APPLICATIONS
Halogenoalkanes, also known as haloalkanes or alkyl halides, are organic compounds in which one or more hydrogen atoms in an alkane have been replaced by halogen atoms, fluorine, chlorine, bromine or iodine. In carbon-halogen bond, halogens have significantly greater electronegativities than carbon except iodine. In result, this functional group is polarized so that the carbon is electrophilic and the halogen is nucleophilic. Halogenoalkanes are can be classified depending on the halogen atom position on the chain of carbon atoms. The carbon which is attached with the halogen atom is linked up with only one other alkyl group in primary halogenoalkanes, whereas directly linked up with two and three other alkyl groups in secondary halogenoalkanes and tertiary halogenoalkanes respectively. In some case, primary halogenoalkanes are counted even though there are no alkyl groups attached to the carbon with the halogen on it. Three characteristics provide important influences on the chemical behavior of halogenoalkanes, these are electronegativity, covalent bond strength and the relative stability of the corresponding halide anions.  Fluoroalkanes have the strongest of the carbon-halogen covalent bonds so that they are unreactive. This is stronger single bond than a carbon-carbon bond. The carbon-chlorine covalent bond is slightly weaker than a carbon-carbon bond, and the bonds to the other halogens are weaker. The stability may be estimated from the relative acidities of the H-X acids. All the hydrohalic acids are very strong, but with small differences in the direction HCl < HBr < HI, with the exception of HF. Halogenoarenes, also called haloarene, or aryl Halide, are  an organic compound in which one or more hydrogen atoms in an aromatic ring have been replaced by halogen atoms. The Haloarenes exhibit many differences compare to haloalkanes in the method of preparation and their chemical and phisical properties. Haloalkanes are used in as refrigerants, solvents, blowing agents, aerosol propellants, fire extinguishing media , and in semiconductor device fabrication. One of big consumption of halogenoalkanes (properly speaking, halogenoalkenes) is as a raw material to prepare plastics such as PVC [poly(chloroethene)] from chloroethene and PTFE [poly(tetrafluoroethene)] from tetrafluoroethene. Halogenoalkanes and halogenoarenes react with lots of compounds resulting in a wide range of different target substances. They are useful intermediates in making other organic compounds.  
  • Summary of substitution and elimination reaction based on alkyl group structure
Alkyl Halides

SN1 and E1

SN2 and E2

Primary (RCH2X) Neither SN1 nor E1 occur both SN2 and E2 will occur
(SN2 preferred. E2 preferred when sterically hindered base is used)
Secondary (R2CHX) will occur slowly in high dielectric ionizing solvents
( SN1 preferred)		 both SN2 and E2 will occur
(SN2 preferred if base is weaker than acetate, pKa = 4.8, E2 preferred if base is strong)
Tertiary (R3CX) both SN1 and E1 will occur
(SN1 preferred)		 No SN2 will occur
E2 will dominate if base is strong

Allyl (H2C=CHCH2X)

 will occur slowly in high dielectric ionizing solvents Rapid SN2 for primary and secondary halides but slow for tertiary. E2 when nucleophile is basic.

Benzyl (C6H5CH2X)

 will occur slowly in high dielectric ionizing solvents Rapid SN2 for primary and secondary halides but slow for tertiary. E2 when nucleophile is basic.
  • SN1 and SN2 reaction order based on alkyl group structure
    • SN2 :  CH3X (100%) > RCH2X > R2CHX > R3CX
    • SN1 :  CH3X < RCH2X < R2CHX < R3CX (100%)
  • Nucleophilicity order
    • F- < Cl- < Br- < I-  In a protic solvent which decrease SN2 rate due to solvating nucleophile
    • F- > Cl- > Br- > I- In a polar aprotic solvent which increase SN2 reaction due to no solvating nucleophile
    • F- > Cl- > Br- > I-  SN2 in the gas phase
(Both protic and aprotic polar solvent  enhance SN1 due to the stabilization of the carbocation intermediate)
  • Leaving group Among halogens: I > Br > Cl > F

Allyl- is the prefix for the univalent organic group, -CH2=CHCH2. Allyl alcohol is an example, CH2=CHCH2OH, clear, pungent liquid, boiling at 96 C; soluble in water. It is prepared from allyl chloride by hydrolysis. Allyl compound, an alkene hydrocarbon, has a vinyl group, CH2=CH-, attached to a methylene -CH2. Because of the highly reactive solid bond, allyl can undergo free radical addition to solid bond which readily combine with themselves or other monomers to form homopolymers or co-polymers which are used in the production of coatings, adhesives and elastomers. In addition to free radical addition, allyl compounds can participate in a wide variety of reactions including electrophilic additions, allylic substitution and oxidation.  Allyl, an unsaturated bond, imparts a characteristic odor in some compounds. An example is allyl isothiocyanate which is the main ingredient of black mustards. (white mustard consists principally of p-hydroxybenzyl isothiocyanate). Allyl isothiocyanate is called mustard oil. Allyl esters are involved in fragrance, flavor, or odor. Allyl Bromide is used as an alkylating agent in the synthesis of polymers, adhesives, pharmaceuticals, perfumes, biochemicals and other organic chemicals including other allyl compounds.
SALES SPECIFICATION

APPEARANCE

clear to light yellow liquid
ASSAY 99.0% min

COLOR, APHA

50 max

MOISTURE

0.1% max
TRANSPORTATION
PACKING 230kgs in drum
HAZARD CLASS 3, 6.1 (Packing Group: I)
UN NO. 1099
OTHER INFORMATION
Hazard Symbols: T F, Risk Phrases: 11/25, Safety Phrases: 16/28A/29/33/36/37/39/45