Patent ID: 6660823
Filing Date: 2003-12-09
Classification: C07F,C08G

Abstract:
A method for controlling the stereo chemistry of X groups to exo or endo positions on a polyhedral oligomeric silsesquioxane (POSS) compound comprising, adding reagents selected from the group consisting of a) CF3SO3H then H2O, b) Me3SnOH then HCl aq and c) HBF4/BF3 then Me3SnOH then HCl aq to said X groups to change one or more positions thereof to endo or exo, wherein said POSS compound is of the formula [(RSiO1.5)m(RXSiO1.0)n]&Sgr;#, n=4-24, m=1-12, &Sgr;=nanostructure, # is m+n, R is aliphatic, aromatic, olefinic, alkoxy, siloxy or H and said X groups are selected from the group consisting of OH, OSO2, CF3, OSO2, CH3, F, Cl, I, Br, Me3SnO, alkoxy, siloxy and Me3 is (CH3)3 and aq is aqueous.