Organic Chemistry - Resonance

[Wendy.yan]

can someone help me with this question?


Draw the most important resonance contributor of the following structure?

if its to small
http://img196.imageshack.us/img196/8417/48084902.jpg [Broken]

 

[mazinse]

looks like that double bond will have to jump to the other you know where

 

[Wendy.yan]

unfortunately I don't below the c atom?

 

[burningbend]

you'll probably get a migration of the double bond to the lowest bond and then migration of a lone pair from oxygen to form a double bond and make an oxonium ion