Word: reagent
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Dates: during 1950-1959
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...Sheehan, "would be like attempting to repair a fine watch with a blacksmith's sledge and anvil." The critical problem was to find a way to bond a carbon atom and a nitrogen atom to form a chemical ring in the heart of the molecule. Avoiding many standard reagents as too violent, and keeping his solutions at room temperature or lower, Dr. Sheehan finally found a reagent that would...