Copper nitrate, in combination with acetic anhydride , is an effective reagent for nitration of aromatic compounds, under what are known as "Menke conditions", in honor of the Dutch chemist who discovered that metal nitrates are effective reagents for nitration.  Hydrated copper nitrate adsorbed onto clay affords a reagent called "Claycop". The resulting blue-colored clay is used as a slurry, for example for the oxidation of thiols to disulfides . Claycop is also used to convert dithioacetals to carbonyls.  A related reagent based on montmorillonite has proven useful for the nitration of aromatic compounds. 
Functional decomposition is helpful prior to creating functional requirements documents. If you need software for something, functional decomposition answers the question "What are the functions this software must provide". Decomposing is needed to define fine-grain functions. "I need software for energy efficiency measurement" is too general. That's why we break this into smaller pieces until the point where we clearly understand all the functions the systems need to provide. This can be later used as a checklist for completeness of a system.