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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: UHStudent1138 on February 10, 2014, 04:56:21 PM

Title: Nomenclature priorities
Post by: UHStudent1138 on February 10, 2014, 04:56:21 PM

Can someone please explain why the attached image has carbons with priorities of 2 and 3?  I have tried a few online tools, but they cannot explain which carbon is the first carbon in the ordering of the chain.  The rest of the nomenclature makes perfect sense, but I would think the 2's and 3's in the picture ought to be 1's and 2's.

Title: Re: Nomenclature priorities
Post by: sjb on February 10, 2014, 05:26:53 PM

The heteroatom in the epoxide ring is counted as 1