FRACTAL NOTATION FOR NEARLY-SYMMETRICAL DENDRIMERS

Dendrimeric and related molecules that have the same atomic connectivi ty from exterior to core, P-C-1-J(1)-C-2-... Z (P peripheral group, J juncture, C connector, Z core) can be described completely by a highly compact fractal notation, which is of the general form Pf(J1,J2...) ( C-1.C-2...)Z. In this paper, we show how to describe molecules that de viate slightly from the symmetry of a related parent molecule, by use of parenthetic expressions (iX), (dX), and (YrX) which designate atoms or molecular groups that are inserted, deleted, or replaced by other groups in the parent. (C) 1998 John Wiley & Sons, Inc.