The theoretical part is focused on the preparation of the trans-resveratrol dimers, their occurrence in the plants and their isolation possibility with emphasis to trans-epsilon-viniferin. In the experimental part of master thesis the selected reagents, namely 2-hydroxy-1,4-naphthoquinone, tetrachloro-1,4-benzoquinone, laccase and ferric chloride, were studied with the aim of the trans-resveratrol dimer preparation. Furthermore, the Fenton reaction and its modification was also studied. Last part of this thesis is devoted to the trans-epsilon-viniferin isolation from grape cane by chromatographic methods.