Lecture 2 - Note: in class we did not discuss a suffix for...

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To Clarify 1. when naming branched alkanes where prefix’s di, tri, tetra, penta (etc) are involved: a) if the prefix relates to groups attached directly to the chain the prefix DOES NOT count when considering alphabetical order – see example below. 3-ethyl-4,5-dimethyloctane NOT 4,5-dimethyl-3-ethyloctane note: in this case the ‘di’ did not count for alphabetizing! b) if the prefix relates to groups attached to a branch the prefix DOES count when considering alphabetical order – see example below. This rule can be simplified by stating that if the prefix is in brackets it counts when considering alphabetical order. 5-(1,1-dimethylethyl)-3-ethyloctane NOT 3-ethyl-5-(1,1-dimethylethyl)octane note: in this case the ‘di’ does count for alphabetizing! 2. Priority for assigning root name: carboxylic acid > aldehyde > ketone > alcohol > amine > alkane For example, if you have a ketone and an alcohol functionality in the same molecule the root name would be derived from that of the ketone.
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Unformatted text preview: Note: in class we did not discuss a suffix for ethers or alkyl halides therefore these two functionalities are always named as branches on the alkane chain. If alcohol is part of molecule that contains a ketone or an aldehyde or a carboxylic acid then the alcohol is not the root name instead it is called hydroxy and named as a branch. YOU WILL NOT BE GIVEN EXAMPLES WHERE AN AMINE IS IN THE SAME MOLECULE AS AN ALCOHOL, KETONE, ALDEHYDE OR CARBOXYLIC ACID. ALSO YOU WILL NOT HAVE TO NAME COMPOUNDS WHERE THERE IS BOTH AN ALDEHYDE AND CARBOXYLIC ACID OR AN ALDEHYDE AND A KETONE OR A CARBOXYLIC ACID AND A KETONE IN THE SAME MOLECULE. 3. There is some confusion regarding nomenclature of amines. We only covered simple amines where there were no branches in the alkane chain with this in mind, the nomenclature we discussed in class (ending yl amine) is what you should follow. See below for examples. NH 2 N butylamine butyldimethylamine...
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Lecture 2 - Note: in class we did not discuss a suffix for...

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