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Over the past fifty years nuclear magnetic resonance spectroscopy, commonly referred to as nmr, has become the preeminent technique for determining the structure of organic compounds. Of all the spectroscopic methods, it is the only one for which a complete analysis and interpretation of the entire spectrum is normally expected. Although larger amounts of sample are needed than for mass spectroscopy, nmr is non-destructive, and with modern instruments good data may be obtained from samples…

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from nytimes.com

John D. Roberts Dies at 98; He Revolutionized the Field of Organic Chemistry

He popularized nuclear magnetic resonance spectroscopy, a tool used to understand chemical structures, and was a leader in understanding how organic reactions occurred.