More details would be useful.
One of the likely oxidation products of phenol is quinones which are yellow.
http://en.wikipedia.org/wiki/1,4-Benzoquinone
in dependence on the degradation route it might be meta-cleavage prodcut as for example ... http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3658485/
this usually comes up during phenol degradation ...
Since we don't know the conditions it is hard to say.
Which of the structures in your link do you suggest causes the yellow color?
I think 1,2-benzenediol and 1,3-benzenediol are colorless and meta-quinone is supposed to be unstable (and ortho-quinone is red).
It MUST be 2-hydroxymuconic semialdehyde which is yellow, originating from extradiolic cleavage of catechol formed from phenol through phenol monooxygenase
I approve with the above result. i am running a bioreactor at microaerophilic condition with phenol as carbon source. i also observed a good yellow colour
The 2-hydroxymuconic semialdehyde accumulates very often during degradation of phenols which are being broken down/degraded/mineralized via catechol through the meta-cleavage pathway: the catechol 2,3-dioxygenase producing the semialdehyde in general has higher specific activity than the enzyme breaking down the yellow compound
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