Advances in Dendritic Macromolecules : 1995 (Advances in by G.R. Newkome

By G.R. Newkome

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Extra info for Advances in Dendritic Macromolecules : 1995 (Advances in Dendritic Macromolecules) (Advances in Dendritic Macromolecules)

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J. Macromolecules 1993, 26,1514. 44. ; White, J. W; Hawker, C. J,; Wooley, K. ; Fr6chet, J. M. J. 7. Phys. Chem. 1993,97, 293. This Page Intentionally Left Blank CASCADE MOLECULES: BUILDING BLOCKS, MULTIPLE FUNCTIONALIZATION, COMPLEXING UNITS, PHOTOSWITCHING Rolf Moors and Fritz VogtIe ABSTRACT I. INTRODUCTION A. Repetitive Synthesis II. TOSYLAMIDE CASCADES A. Divergent Synthetic Strategy B. Convergent Synthetic Strategy III. POLYAMINE DENDRIMERS A. Tris(2-aminoethyl)amine as Core Unit B. Pentaethylenehexamine as Core Unit C.

The resultant hybrid copolymers were shown to have the expected structure, where the globular dendritic fragments are attached to a linear polystyrene backbone. Significantly, the feed ratios and the product ratios were approximately the same for all of the copolymerization studies, and even at macromonomer molecular weights of 6805 (G = 5), only a small decrease in incorporation was observed with increasing size of the dendritic macromonomer. This suggests that steric crowding around the styrene unit at the focal point is not great enough to affect its reactivity significantly with the relatively bulky, growing polymer chain.

The preparation of oligo- and polypeptides is a repeating sequence of protection and activation of the reactants, followed by the addition of a new amino acid. In 1963, one of the highlights in repetitive synthesis was the automation of peptide production by Merrifield^ (Figure 1). In the literature, authors often speak of a "protein machine" since it is now possible to build up peptides mechanically without the preparative help of a chemist. 1) LDA. ^0CH2Ph "^ Br J ^-OCHoPh ^ - 0CH2Ph 2) H2. Pd/C Br Br 0CH2Ph 0CH2Ph Scheme 2.

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