Polybenzene dendrimer

The monodisperse polybenzene dendrimers reported by Miller and Neenan et al. are arranged symmetrically around a 1,3,5-substituted benzene core unit up to 46 benzene rings were coupled convergently (Fig. 4.15) [29]. 

Fig. 4.15 Polybenzene dendrimers (according to Miller, Nee-nan, et al.). For the sake of clarity, some of the C-C bonds are drawn with greatly exaggerated lengths to avoid overlapping in this (energetically unfavourable) planar conformation...

Polybenzene dendrimers can be peripherally functionalised, for example with peptide units, leading to a dendrimer with up to 16 terminal lysine units [36]. 

Fig, 4.18 Convergent synthetic route to polybenzene dendrimers (according to Mullen et al.). Because of the mutual ster-ic hindrance of the numerous benzene rings, the molecule shown will tend to be spherical rather than planar... 

T. M. Miller, T. X. Neenan, Chem Mater. 1990, 2, 346-349. T. M. Miller, T. X. Neenan, R. Zayas, H. E. Bair, /. Am. Chem. Soc. 1992, 334, 1018-1025. We use the family name polybenzene dendrimers (generally polyarene dendrimers) instead of polyphenylene dendrimers because the rules of nomenclature restrict pheny-lene to -QHg-. 

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