I create quite a few new Reaction objects in my code.

Following the advice to use the ChemObjectBuilder, more specifically the SilentChemObjectBuilder, to instantiate CDK objects specified in the package org.openscience.cdk.interfaces and taking into consideration that reflection isn't known for its speed:

Is it worthwhile adding a newReaction() method to SilentChemObjectBuilder similar to the newAtomContainer, newAtom and newBond methods?

If this seems a worthwhile endeavor I am happy to add this functionality and submit a PR.