Where is the alcohol peak on 5-iodovanillin?

[mnmman]

So I'm pretty sure I got 5-iodovanillin. The melting point in the literature is 183-185 C and I got 182.7-183.5 C. But my NMR spectrum isn't showing the alcohol peak. It barely shows up on the SDBS spectrum also (http://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi). Does anybody know why this is?

 

[mnmman]

Well I posted on another forum and they said that it is probably to to rapid exchange of the phenolic proton on there. Makes sense because I used acetone and ketones have a lower pka value than phenols. So yes it is solved. Thanks tho