Question

Question about IUPAC nomenclature
In my book the stem/prefix for a five-carbon chain is given as pent-
And the suffix for ketones is given as -anone.

However for a five carbon chain, which carbonyl group on the third carbon, i would think it should be pent-3-anone.

But wikipedia gives the name of pentan-3-one. Why is this? Looks very inconsistent. Anybody have a reason for this? @abb0t perhaps?

Answer 1

the suffix for a ketone is "-one", not "-anone".

it wouldn't work say when you have other functional groups, like alkenes, where the names end in "-enone", like "hexenone".

Answer 2

As for the formatting, i've always seen it written like your second example; pentan-3-one.

Answer 3

what purpose does the -an- part serve then? You could just say pent-3-one

Answer 4

it's part of "alk\(\color{red}{an}\)e"

Answer 5

Meaning it is a derivative of alkane right? :)

Answer 6

yeah, it is an alkane derivative.

and yes, thats the name of that michael-acceptor structure

Answer 7

Thank you so much :)

Answer 8

no problem, dude !