Hi Dan - thanks for the reply. Most of my confusion stems from the fact that my text lists formyl-
, not oxo-
as the prefix for a non-principal aldehyde group, so I assumed I should use this.
On the other hand, now I have another point of confusion - Wikipedia says here
that I should always use oxo-
unless the carbon in that group can't be included in the chain, but here
it says that oxo-
is only for when the compound is a "natural product or a carboxylic acid".
I had a look at Wikipedia's references on the page for Aldehyde, and section R-126.96.36.199.1 on this page
gives an example of a compound named both 3,6-dioxohexanoic acid and 5-formyl-3-oxopentanoic acid, but the text says that oxo-
is used for an =O substituent and formyl-
is used for a -CHO substituent. Also, the end of the first chapter in this other page referenced from Wikipedia
says to use formyl-
except in names of natural products. I guess carboxylic acids (and derivatives) count as this? I'm not sure what does...
Anyway, now my head's spinning. I guess I'll ask my tutor which I should use when.
Thanks very much for your help.