Spherical polyphenylene dendrimers via Diels–Alder reactions: the first example of an A4B building block in dendrimer chemistry

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Abstract
The [2+4]cycloaddition of the novel A4B building block 2,3,4,5-tetrakis(4-triisopropylsilylethynylphenyl)cyclopenta-2,4-dienone 3 with 3,3’,5,5’-tetraethynylbiphenyl 1 allows the rapid synthesis of a spherical polyphenylene nanoparticle with 102 benzene rings.