Methyltrioxorhenium catalyzed highly selective dihydroxylation of allenes – a novel catalytic protocol for the synthesis of α-hydroxyl ketones.
Phosphonoallenes in Brønsted acids (TfOH, FSO3H, H2SO4) gave the corresponding 1,2-oxaphosphol-3-enium ions, that were studied by means of NMR and DFT calculations.