Posted by Kristy on Sunday, November 14, 2010 at 8:37pm.
Kristy--I've seen this post repeatedly for the past 2-3 days. Here is the site I used and I don't get 18 but quite a few more than that. I'm not an organic chemist, not that familiar in reading these stick models, but I don't think 18 sigma bonds is correct. I did not count any of the ring bonds in benzene as sigma bonds (but I did count the -H attached to the benzene ring as sigma bonds). There are two H atoms attached to most of the C atoms in the heterocyclic ring and the C bonds in the heterocyclic ring are sigma bonds as well as the CH3 at the top.
http://en.wikipedia.org/wiki/Methylphenidate
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