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CH2I?

Posted: Fri Mar 04, 2016 5:18 pm
by Sina Rahmani 4A
why is CH2I called Iodomethyl? I thought CH3I would be Iodomethyl. Thanks!

Re: CH2I?

Posted: Fri Mar 04, 2016 5:35 pm
by Chem_Mod
CH3I is iodomethane, but CH2I invokes that it is a substituent, so it would be an iodomethyl group just like like the difference between methane (CH4) and methyl as a substituent (CH3).

Re: CH2I?

Posted: Fri Mar 04, 2016 5:36 pm
by Jasmeet Dhaliwal 3E
CH2I is called iodomethyl because the whole molecule is a substituent, but within this molecule, iodine is also acting as a substituent; it's a case of a substituent within a substituent. If we were to consider CH3I, carbon already forms four bonds. It would not be able to bond to another atom, and thus it could not be a substituent. CH3I is called iodomethane for this reason.