According to the concept of vitalism vital force theory , organic matter was endowed with a "vital force". Around Michel Chevreul started a study of soaps made from various fats and alkalis. He separated the acids that, in combination with the alkali, produced the soap. Since these were all individual compounds, he demonstrated that it was possible to make a chemical change in various fats which traditionally come from organic sources , producing new compounds, without "vital force". The event is now generally accepted as indeed disproving the doctrine of vitalism.
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Ostatak grupe se klasifikuje na osnovu funkcionalnih grupa. Prsteni mogu da budu kondenzovani na uglju tako da jedan atom ima dve veza u jednom prstenu i dve veze u drugom. To su spiro jedinjenja. Proces povezivanja se naziva polimerizacija , dok su lanci polimeri. Povezane molekulske jedinice su monomeri. Iz izoprena se u biljkama formiraju terpeni , terpenoidi , pojedini alkaloidi , i jedinstvena grupa ugljovodonika zvanih biopolimerni poliizoprenoidi.