Gentlemen,
I'm trying to find the correct term for this process. You sometimes hear chemists describe how they 'tweaked' a molecule by adding a benzine ring here, tacking on a hydroxyl radical there, removing an atom here, inverting a diatomic pair etc, etc. etc. In this way they can create and re-arrange molecules with different properties. I've tried googling 'chemical engineering' which struck me as a suitable term for it, but that just brings up loads of stuff about oil refineries, power stations and whatnot. So... what's the correct name for this terribly clever stuff?