valent bond, and combinations thereof, where one or more hydrogen atoms can optionally be replaced with fluorine, and where r and r??? are independently integers of 0 to about 20, s is independently an integer of 1 to about 10 for each (CsH2sO), t is an integer of 1 to about 6, and p is an integer of 0 to about 4; with the proviso that at least one chiral center of R* is spaced from the central co