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General Information:


CAS Number: 7553-56-2

Molecular Weight: 253.81 g/mol

Appearance: Metallic gray solid

Melting Point: 113 C

Boiling Point: 184 C

Iodine exists mainly in its diatomic form as I2. It is a metallic gray solid which slowly sublimes to give a purple gas. Iodine is useful as a reagent for various iodination reactions. Iodine is also commonly used as a stain for visualizing compounds on TLC plates.

Common Uses:

Reagent for the iodination of aromatic ring systems

Reagent for the conversion of alcohols to iodides


Elemental iodine (I2) is toxic if taken orally.


1) Patent Reference: WO2012129338, page 84, (12.0 MB)

2) Patent Reference: WO2016018697, page 79, (5.3 MB)

3) Wikipedia: Iodine (link)

4) Iodine (link)