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The dynamic stereochemistry of silatropic rearrangements of tetrahydro-4,4,8,8-tetramethyl-4,8-disi[a-sym-indacene (dimer of 6,6-dimethyl-6-silafulvene), which exists in solution a.s an equilibrium rnixmre of two interconverting isomers, was studied. The mechanisms and complete kinetic scheme of rearrangements were established using IH, taC, and 29Si 2D quantitative EXSY NMR spectroscopy. It was tbund that the interconversion and degenerate rearrangements of the observed isomers proceed via two concurrent pathways due to the formation of different intermediates. The activation parameters of the rearrangements were determined by means of total lineshape analysis of dynamic NMR (DNMR) spectra.