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The first two examples of a tetrasilatetrathia[8]circulene were synthesized in two steps from a tetraiodotetrathienylene by using a fourfold intramolecular dehydrogenative silylation of C−H bonds as the key step. A single-crystal X-ray diffraction analysis revealed that tetrasilatetrathia[8]circulene contains a perfectly planar [8]radialene skeleton. The excited-state dynamics of tetrasilatetrathia[8]circulene were evaluated by steady-state and time-resolved spectroscopic measurements, revealing an efficient intersystem crossing in the excited state. [ABSTRACT FROM AUTHOR]

We have succeeded in the diversity-oriented synthesis of tetrathia[8]circulenes by sequential C–H borylation and annulation from cyclic tetrathiophene, and time-resolved microwave conductivity studies have proved that the intrinsic hole mobilities of tetrathia[8]circulenes are dependent on the chain length of the alkyl substituents at the peripheral positions. [ABSTRACT FROM AUTHOR]

The synthesis of tetrasilatetrathia[8]circulenes as a new family of hetro[8]circulenes from tetrathienylene is described. The saddle structure of tetrathienylene was transformed into the planar structure of tetrasilatetrathia[8]circulene by using iridium, palladium, and rhodium catalysis. For more information, see the Communication by Y. Miyake et al. on page 6948 ff. [ABSTRACT FROM AUTHOR]

Synthesis of tetrathia[8]circulenes is achieved by sequential C-H borylation and annulation from cyclic tetrathiophene. [ABSTRACT FROM AUTHOR]