..all samples of oz species tested carefully by endlessness in the acacia analysis thread were done with dcm, including up to two weeks sitting in solution and heat, and there was not even a trace of aforementioned by-product..

i think most solvents, in certain conditions, could react..

also remember, most lab grade solvents are still sold as 98%-99% pure..there can be trace products of long term storage (years or more in storage for instance)

btw, chloroform is known to react easily and create byproducts..