priority in naming

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Joann Hernandez 2F
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

priority in naming

Postby Joann Hernandez 2F » Mon Feb 29, 2016 5:56 pm

Can someone tell me the order in highest priority for naming hydrocarbons? For example in lecture Dr. Lavelle said that double bonds have highest priority and then functional groups and then substituents but then you have to take the highest atomic # and the alphabet into account. Can someone organize the true order of highest to lowest priority? Thanks!

Johnny Yu
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: priority in naming

Postby Johnny Yu » Mon Feb 29, 2016 8:26 pm

I would also like an answer to this question please!

But to answer your question about highest atomic number and alphabetical name, highest atomic number is used to determine cis and trans isomers and alphabetical name is when substituents are the same distance apart from either end. For example if there was a methyl group on the 2nd carbon starting from left, but an ethyl on the 2nd carbon starting from right then I think ethyl will get the priority over methyl. This can be seen on the course reader page 95 for 3-ethyl-5-methyl-heptane.


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