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Iodomethane CAS#74-88-4

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Chemical Name：Iodomethane

CAS No.:74-88-4

Molecular Formula：CH3I

Molecular weight:141.94

Sample: Available

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Product Details

Products Description of Iodomethane CAS#74-88-4

Methyl iodide is a halogenated hydrocarbon with the molecular formula CH3I, MeI. It is a monoiodine substitute of methane. The boiling point is 42.4℃, the relative density is 2.279 (20/4℃), it is a volatile liquid with high density at room temperature, the dipole moment is 1.59D, and the refractive index is 1.5304 (20°C, D), 1.5293 (21°C, D). Methyl iodide is miscible with common organic solvents, slightly soluble in water, soluble in ethanol and ether.

The pure product is colorless and has a special odor. When exposed to sunlight, it will decompose I2 and become purple, which can be removed by adding metallic copper. Methyl iodide exists in small amounts in rice fields. Methyl iodide is a commonly used methylating agent in organic synthesis. Methyl iodide is an ideal substrate for SN2 substitution reactions. On the one hand, it is easy for nucleophilic reagents to attack because of its small steric effect; on the other hand, the iodide ion is a good leaving group. Therefore, methyl iodide can be used to methylate phenols and carboxylic acids. The base (K2CO3 or Li2CO3) removes the acidic protons of the carboxylic acid or phenol to form carboxylate ions and phenolate ions, which then act as nucleophiles to undergo SN2 reactions.

Iodomethane Chemical Properties

Melting point	−64(lit.)
Boiling point	41-43 °C
density	2.28 g/mL at 25 °C(lit.)
vapor density	4.89 (vs air)
vapor pressure	24.09 psi ( 55 °C)
refractive index	n20/D 1.530
Fp	−18 °F
storage temp.	2-8°C
solubility	water: soluble14g/L at 20°C
form	Liquid
Specific Gravity	2.280
color	Clear
PH	5.2 (H2O, 25℃)
Odor	Sweet, ethereal odor
Water Solubility	14 g/L (20 ºC)
Sensitive	Light Sensitive
Merck	14,6087
BRN	969135
Henry's Law Constant	5.06 at 21 °C (Gan and Yates, 1996)
Exposure limits	TLV-TWA 2 ppm (～11 mg/m3) (ACGIH), 5 ppm (MSHA and OSHA); carcinogenicity: Animal Limited Evidence (IARC), Suspected Human Carcinogen.
Dielectric constant	7.0（20℃）
Stability:	Light Sensitive
LogP	1.510
CAS DataBase Reference	74-88-4(CAS DataBase Reference)
IARC	3 (Vol. 41, Sup 7, 71) 1999
NIST Chemistry Reference	Methyl iodide(74-88-4)
EPA Substance Registry System	Methyl iodide (74-88-4)

Safety Information

Hazard Codes	T,F,Xn
Risk Statements	21-23/25-37/38-40-11-39/23/24/25-23/24/25-38-20/22
Safety Statements	36/37-38-45-9-24-16-7-60-36/37/39-33-23-20-4
RIDADR	UN 2644 6.1/PG 1
WGK Germany	1
RTECS	PA9450000
F	8
TSCA	Yes
HazardClass	6.1
PackingGroup	I
HS Code	29033990
Hazardous Substances Data	74-88-4(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 76 mg/kg; LD50 s.c. in mice: 0.78 mmoles/kg (IARC, 1986)
IDLA	100 ppm