title: Synthesis and reactivity of nitrogen nucleophiles-induced cage-rearrangement silsesquioxanes.
abstract: Novel phthalimide and o-sulfobenzimide-functionalized silsesquioxanes were successfully synthesized via nucleophilic substitution reactions from octakis(3-chloropropyl)octasilsesquioxane. Surprisingly, the formation of deca- and dodecasilsesquioxanes cages was discovered during substitution with phthalimide, but only octasilsesquioxane maintained a cage in the o-sulfobenzimide substitution reaction. Moreover, we report the electronic effect of nitrogen nucleophiles to promote cage-rearrangement of inorganic silsesquioxane core for the first time. Structures of products were confirmed by (1)H, (13)C, and (29)Si NMR spectroscopy, ESI-MS analysis, and single-crystal X-ray diffraction.
authors.affiliation: Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), ‡Department of Physics, and §Capability Building Unit for Nanoscience and Nanotechnology, Faculty of Science, Mahidol University , Rama VI road, Ratchathewi, Bangkok 10400, Thailand.
authors.forename: Thapakorn
authors.initials: T
authors.lastname: Jaroentomeechai
authors.forename: Pa-Kwan
authors.initials: PK
authors.lastname: Yingsukkamol
authors.forename: Chuttree
authors.initials: C
authors.lastname: Phurat
authors.forename: Ekasith
authors.initials: E
authors.lastname: Somsook
authors.forename: Tanakorn
authors.initials: T
authors.lastname: Osotchan
authors.forename: Vuthichai
authors.initials: V
authors.lastname: Ervithayasuporn