What other oxidizing reagents could have been used to convert the 9-fluorenol to 9-fluorenone?

3 answers

That all depends upon what you used, doesn't it. What did you use? Perhaps I can suggest another one.
The one we used was sodium hypochlorite (NaOCl)
There are a large number of reagents that will carry out this oxidation.

Some examples are Jones reagent
http://en.wikipedia.org/wiki/Jones_oxidation

and PCC
http://en.wikipedia.org/wiki/Pyridinium_chlorochromate