Synthesis double-exponential method

Recently, new methods such as orthogonal synthesis, double-stage convergent method, double-exponential method, hypermonomer method, and click chemistry have been disclosed for synthesis of dendrimers [5]. 

These accelerated growth procedures have been used by a number of groups to synthesize dendritic poly(amides),222-224 poly(esters),225 poly(ether urethanes),226 and chiral poly(ethers).227 The orthogonality of the focal and peripheral protecting groups required for double exponential growth also enables facile modification at either the periphery or focal point. Although this approach is one of the most rapid methods yet reported for the synthesis of well-... 

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