 Stepwise mechanisms in dyotropic reactions have also been investigated.In organic synthesis an important application is the conversion of 4-substituted-gamma-lactones to butyrolactones.Type I dyotropic rearrangements also occur around carbon-oxygen bonds, such as the thermal equilibration of RRSi1R3C-O-Si2R3 to RRSi2R3C-O-Si1R3.