In this Diploma work I have presented and described pyrans, 2H-pyran-2-ones and their derivatives as an important class of natural compounds with broad application in organic synthesis with emphasis on cycloadditions. In literature I have found their occurrence and their usage. Considering their therapeutic effects, they are often used in medicinal research. It is possible to find them in plants and animals, where they have different roles. For example, defense, inhibitors of various enzymes, natural pigments… I have described synthetic pathways to 2H-pyran-2-ones and their further reactions and represented these with schemes. I have also described Diels–Alder reaction, one of the most important methods in forming new C–C bonds and bridged bicyclic compounds. At the end I have added a presentation of general spectroscopic features of 2H-pyran-2-ones for identifying 2H-pyran-2-ones with IR, UV and NMR spectroscopy.
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