31. Both pyrimidines and purines resemble pyridine and are thus weak bases and relatively unreactive towards electrophilic aromatic substitution. 32. In fact, most alkanes are unreactive except in extreme conditions, such as combustion or strong sunlight. 33. For example, copper is a rather unreactive metal, and has no reaction with concentrated hydrochloric acid. 34. Additionally, in dilute neutral solutions they tend to be deprotonated anions ( and thus unreactive as electrophiles ). 35. The Simmons-Smith reaction adds to alkenes while the Buchner ring expansion allows addition to typically unreactive arenes. 36. Noble gasses are particularly useful for these experiments because they are easy to handle, unreactive and relatively inexpensive. 37. Then soaking in a benzotriazole ( BTA ) ethanol solution to chelate the copper and make it unreactive . 38. Generally, amino acid residues are unreactive toward nucleophiles, but the dehydroamino acids are exceptions to this pattern. 39. Although the noble gases are generally unreactive elements, many such compounds have been observed, particularly involving the element xenon. 40. I've been reading about how one can make a compound of gold and xenon, two apparently unreactive elements.
