Preparation, Structure, and Redox Reactions of Nine-Membered Cyclic Peroxides: A Novel Electrochromic System Undergoing Reversible Extrusion and Trapping of O(2) This work was supported by the Ministry of Education, Science, and Culture, Japan (No. 10146101). Financial support by the Izumi Science and Technology Foundation and by a Research Grant from the Iwatani Naoji Foundation (T.S.) are gratefully acknowledged. J.N. thanks JSPS Research Fellowships for Young Scientists. We thank Prof. Tamotsu Inabe (Hokkaido University) for the use of facilities to analyze the X-ray structures. Technical support by Mr. Kenji Watanabe and Dr. Eri Fukushi (GC-MS & NMR Laboratory, Faculty of Agriculture, Hokkaido University) is gratefully acknowledged.