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Attraktive Variante: Eine neuartige Disauerstoff‐Aktivierung durch Sulfinsäuren führt ohne Zusatz von Übergangsmetallverbindungen oder Radikalinitiatoren unter milden Bedingungen zu sekundären und tertiären β‐Hydroxysulfonen. β‐Hydroperoxysulfon wurde als eine wichtige Zwischenstufe isoliert.

A novel Pd-catalyzed C-H functionalization reaction was developed to construct a quaternary carbon center with high yield. This reaction provides an efficient method for the synthesis of 9,9'-diarylfluorenes by direct arylation of monoarylfluorene.

A new route to various substituted fluoren-9-ones has been developed via an efficient Pd-catalyzed carbonylative multiple C-C bond formation. Under a CO atmosphere, using commercially available aryl halides and arylboronic acids as substrates, this three-component reaction proceeded smoothly in moderate to excellent yields with good functional-group compatibility. The mechanistic investigations suggested a sequential process for the reaction that forms o-bromobiaryls in the first stage followed by a cyclocarbonylation reaction. This chemistry has been successfully extended to construct ladder-type oligo-p-phenylene cores.