SPECTROSCOPY
Until about 1945, the structure of a newly discovered organic compound was based almost entirely on its molecular formula and chemical reactions. the compound was converted into a known compound by a series of specific reactions, or it was synthesized from smaller known compounds by specific reactions. This way of finding the structure of an organic compound was time-consuming and not always 100% accurate. The conclusions were as reliable as the understanding of the reaction that were carried out.
Organic chemistry has been revolutionized in the past 40 years by the use of spectroscopic method for analysis and structure determination.
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