Reactions have been designed to verify the reversibility of butylamine intercalation–deintercalation in the layered perovskite‐type oxide KCa2Nb3O10. The reactions include ion exchange to form HCa2Nb3O10·1.5H2O, butylamine intercalation for producing C4H9NH3Ca2Nb3O10, transformation of C4H9NH3Ca2Nb3O10 into HCONH3Ca2Nb3O10 by formamide substitution and conversion of HCONH3Ca2Nb3O10 into HCa2Nb3O10·1.5H2O again by ion exchange. The complete reaction cycles were monitored by XRD, Raman spectroscopy, thermogravimetric (TG) and elemental analysis, and the resulting information was used to propose the structure evolution and to determine the organic components of the products. The well‐matched powder X‐ray diffraction (XRD) patterns and Raman spectra between the initial and recovered protonated materials confirmed that they have identical structural features of a protonated triple‐layered perovskite. The C, H and N elemental analysis results and TG data indicate that the regenerated layered perovskite‐type oxides also have a high capacity for alkylamine intercalation. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)