Fig. 3: Unsymmetrical ultraphosphates.

For the discussion of yields see Supplementary Methods 12.2. a Syntheses of threefold modified unsymmetrical ultraphosphates using either a chloro phosphormono- or diamidite. b 31P{1H}-NMR spectrum of unsymmetrically modified ultraphosphate 46. c Twofold and singly modified ultraphosphates by deprotection of Fm-modified, unsymmetrical ultraphosphates using DBU. d Application of click-chemistry on ultraphosphate 49.