[HarrisonMarshall]

How would one go about converting C9H13NO3 to C9H9NO3 with maximum purity? What chems and equipment would I need? Full instructions would be very much appreciated!

[Dan]

converting C9H13NO3 to C9H9NO3

This is too ambiguous to answer, there are many isomeric compounds with those formulas. You need to show the full structure.

[Arkcon]

What chems and equipment would I need? Full instructions would be very much appreciated!

Furthermore, we don't answer questions of this sort here.  Someone who's taking a university undergraduate course in organic chemistry would have been introduced to the topic of organic structures, and wouldn't ask a question like yours.  A quick check on Wikipedia lists, for your first formula, a couple of decongestants, and for your second formula, a couple of controlled substances.  There are probably many more possible compounds, but just a reminder of this forum's rules for you  -- this isn't a kiddie druggie forum.  We don't discuss those synthesis of those sorts of compounds, and we certainly wouldn't give "Full instructions" to someone who lacks the background knowledge.