What are the esters formed from fumaric acid and propanol ?

[Alpha123]

Homework Statement

what are the esters formed by:
-fumaricacid and propanol?
- succinic acid and butanol
-citric acid and methanol
and how does each one smell

Homework Equations

none

The Attempt at a Solution

I have drawn out each of the structural diagrams but i couldn't draw the esters. My attemp at naming them are propyl fumarate ,butyl succinate, and methyl citrate. I am guessing they have a fruity smell.

 

[Borek]

This is a bit tricky. Names you listed so far are not off, but from the way problem is worded it is not clear whether the esterification stops after one carboxyl group reacted - and all three acids have more than one carboxyl acid group.

 

[epenguin]

The odours are possibly of some interest, worthy to be aware of. You can easily find articles and lists via Google e.g. here https://en.m.wikipedia.org/wiki/Ester - there is a big culture and for that matter commerce around odours of esters.
To experience if possible. But to have to have to conscentiously learn them from a book!

When a chemical substance is said to have a given odour it might be due to a minor contaminant, but all these esters are easily purified and it's OK.

 

[Alpha123]

the answers were difumaric acid, disuccini acid and trimethyl citrate. Thanks for your help everyone !

 

[Borek]

difumaric acid

And how it is an ester?