CAS No.: 74-88-4
Formula: CH3I
Exact Mass: 141.92800
Molecular Weight: 141.93900
PSA: 0.00000
LogP: 1.05120
Description Feedback
Methyl iodide, also called iodomethane, and commonly abbreviated "MeI", is the chemical compound with the formula CH3I. It is a dense, colorless, volatile liquid. In terms of chemical structure, it is related to methane by replacement of one hydrogen atom by an atom of iodine. It is naturally emitted by rice plantations in small amounts. It is also produced in vast quantities estimated to be greater than 214,000 tons annually by algae and kelp in the world's temperate oceans, and in lesser amounts on land by terrestrial fungi and bacteria. It is used in organic synthesis as a source of methyl groups.
Methyl iodide had been approved for use as a pesticide by the United States Environmental Protection Agency in 2007 as a pre-plant biocide used to control insects, plant parasitic nematodes, soil borne pathogens, and weed seeds. The compound was registered for use as a preplant soil treatment for field grown strawberries, peppers, tomatoes, grape vines, ornamentals and turf and nursery grown strawberries, stone fruits, tree nuts, and conifer trees. After the discovery phase in a consumer lawsuit, the manufacturer withdrew the fumigant citing its lack of market viability.

Properties Feedback
Appearance & Physical State:Clear to pink liquid
Melting Point:-64ºC
Boiling Point:41-43ºC
Flash Point:-28ºC
Refractive Index:1.531
Water Solubility:14 g/L (20 ºC)
Storage Condition:Store at 0ºC
Vapor Pressure:24.09 psi ( 55 °C)
Vapor Density:4.89 (vs air)

Safety Info Feedback

hazard declaration:H301 + H331; H312; H315; H317; H334; H335; H351
hazard declaration add:
waring notice:P261; P280; P301 + P310; P311
Hazard Class:6.1
Safety Statements:S16-S24-S36/37-S38-S45-S9
HS Code:2903399030
Packing Group:I
WGK Germany:1
Risk Statements:R11; R21; R23/25; R37/38; R40
Hazard Codes:F

GC Analytical Method Total: 24 GC Analytical Method
Kovats' RI, non-polar column, isothermal [Detail]
Column type Active phase Temperature (C) Retention Index (I) Reference
Packed OV-1 100. 523. Castello and Gerbino, 1988
Kovats' RI, non-polar column, isothermal [Detail]
Column type Active phase Temperature (C) Retention Index (I) Reference
Packed OV-1 125. 528. Castello and Gerbino, 1988


Precursor and Product