Common Name

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Common Name

Postby kshalbi » Thu Mar 03, 2016 10:24 am

Is the common name of this molecule 1-bromo-7-(tert)-butyl-3-chloro-4-ethylnonane? Or is the tert part supposed to be a neo-?

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Re: Common Name

Postby Chem_Mod » Thu Mar 03, 2016 5:34 pm

This should be named by IUPAC. If you wanted to use tert-butyl to describe the thing at the bottom left, it would be unclear what the parent chain should be.

Using IUPAC, it is clear that the parent chain has 9 carbons. The substituents are bromo, chloro, ethyl, dimethyl. One way of numbering is 1,4,5,8,8. The other way of numbering is 2,2,5,6,9. Since 1 is less than 2, the first way of numbering wins.

The name is 1-bromo-4-chloro-5-ethyl-8,8-dimethylnonane (the prefixes are arranged in alphabetical order. It was a pure coincidence that the numbers are in order here)

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