Technical Notes：

1.Used for synthesis of corresponding ketone via 2 -iodoxybenzenesulfonic acid catalyzed selective oxidation.

2.Used for the asymmetric synthesis of H-phosphinate esters.

3.Used in total synthesis of natural products e .g. pyrrolizidinones.

4.Reagent for synthesis of diaryl phosphinates having cyclohexyloxy chiral auxiliaries used in Ir-catalyzed c -H amidation of arylphosphoryls.

5.Component of the pentacarboxycyclopentadiene Brønsted acid catalyst used for an enantioselective catalytic inverse electron-demand Diels-Alder reaction of salicylaldehyde acetal-derived oxocarbenium ions and vinyl ethers to generate 2,4-dioxychromanes is described .