In the presented study, dithi(ol)anylium tetrafluoroborates are added to α,β-unsaturated ketones in a Michael-type reaction yielding diverse substituted ketene diothi(ol)anes. The reactions proceed at room temperature in 1 or 13 h without the need of further additives. The presented procedure is in particular useful for dithi(ol)anylium tetrafluoroborates without electron-withdrawing groups in ...

Photolysis of 1-o—toluyl-3,4-dihydroisoquinolines gives protoberberine alkaloids through the intermediacy of x-hydroxy quinodimethanes and spirobenzyl isoquinol ines. Ortho trimethylsilylmethyl benzoyl chlorides on treatment with fluoride ions afford ketene quinodimethanes which can be trapped with reactive dienophiles. The reactivity pattern of these intermediates is considered in terms of the...

5-Diazo Meldrum's acid (DMA) undergoes a photo-induced Wolff rearrangement (WR). Recent gas-phase experiments have identified three photochemical products formed in a sub-ps scale after irradiation, a carbene formed after nitrogen loss, a ketene formed after WR and a second carbene formed after nitrogen and CO elimination (A. Steinbacher, et al. Phys. Chem. Chem. Phys., 2014, 16, 7290-7298). In...