Classifier Instance:

Anchor text: Friedrich Kekulé
Target Entity: Friedrich_August_Kekul\u00e9_von_Stradonitz
Preceding Context: During his work with
Succeeding Context: in Bonn he started a systematic analysis of the terpenes present in essential oils. Up to this time only a few had been isolated in pure form, and structural information was sparse. Melting point comparison and the measurement of mixtures was one of the methods to confirm identical substances. For this method the mostly liquid terpenes had to be transformed into crystalline compounds. With stepwise derivatisation, especially additions to the double bond present in some of the terpenes, he achieved the goal of obtaining crystalline compounds. The investigation of the rearrangement reactions of cyclic unsaturated terpenes made it possible to obtain the structure of an unknown terpene by following the rearangments to a known structure of a terpene. With these principal methods he opened the path to systematic research on terpenes.
Paragraph Title: Major works
Source Page: Otto Wallach

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