ochem question

[allstardentist]

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which one is ester and which one is anhydride?

COOR and OCOR?

Thanks.

 

[NilamPatel]

COOR - ester

OCOR - acid anhydride

i learned this in princeton review orgo:

you COOK with esters so they are COO- and they smell good

i know its corny but i still remember it

 

[allstardentist]

Coo

 

[aranjuez]

The anhydride is more like... R-(C=O)-0-(C=O)-R'

aranjuez

 

[desert]

which one is ester and which one is anhydride?

COOR and OCOR?

Thanks.

Esters are carboxylic acids that their -H is replaced with an -R.
R-CO-OH ---------------- R-CO-OR
CH3-CO-OH--------------CH3-CO-OCH3
In esters look for only one carbonyle group that is connected to an O.

But anhydrides are from the addition of two carboxylic acid:
R-CO-OH + R-CO-OH --------- R-CO-O-CO-R
CH3-CO-OH+ CH3-CO-OH-------- CH3-CO-O-CO-CH3

In anhydrides look for two carbonyle groups seperated with an O, like:
CO-O-CO

Desert 😳