Diaminobutane dendrimers amines

The first family of polycationic cobaltocenium dendrimers reported in the literature is constituted by four generations of the diaminobutane-based polypropylene amine) dendrimers containing 4, 8, 16, and 32 (compound 7 in Fig. 6.7a) cobaltocenium peripheral units, respectively.41... 

The first examples of metallated phosphine-functionalized dendrimers that were suitable as homogeneous catalysts were reported by Reetz et al. [42], DAB-based phosphino dendrimers were synthesized from the commercially available DAB-polypropylene imine dendrimers (DAB = 1,4-diaminobutane) via a double phosphination of the amines with diphenylphosphine and formaldehyde. These dendrimers were loaded with Pd(II) centers by the reaction of the phosphine-functionalized dendrimer with [Pd(Me)2(tmeda)] (tmeda = tetramethylethylenediamine), in which the diphenylphosphino end groups act as a bidentate ligand (Scheme 6). 

Special attention is focused on dendrimers (see Sections 6-4 and 7-6), a new class of regular pol rmers characterized by a tree-type structure, generating from one center, by a great number of branching centers and by the absence of closed rings [83]. Sometimes they are called cascade polymers or polymers with controlled molecular architecture [84], Poly(amidoamine) or poly(propylene-amine) with a diaminobutane nucleus are commonly used for this purpose. In... 

Co(III) and NaBH4. Iterative repetition of these two steps allows one to obtain cascade polymers , as Vogtle initially described them, but in poor yields. Optimization of Vdgtle s original inefficient synthesis by Meijer and Mulhaupt in 1993 resulted in the preparation of poly(propylenimine) dendrimers (Scheme 13.9). The high yield and degree of purity obtained in this synthesis has made these dendrimers one of the most popular architectures in dendrimer chemistry. They have also been produced on an industrial scale and can be found under different names, in particular PPI (for polypropylenimine), DAB (for diaminobutane) and POPAM (for polypropylene amine), depending on the nature of the core. 

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