Isolation of a thiaminodioxyphosphorane and of the corresponding thriaminooxyphosphonium dipolar ion and demonstration of their equilibration in solution

Phosphoranes Formed From the Condensation of Trico-Ordinate Phosphorus Compounds With Phenanathraquinone

“…Since we were aware that phenanthraquinone may give rise to bicyclic phosphoranes with low field chemical shifts (ca +30)'001' it was decided to prepare a range of phosphoranes (5) from tricoordinate phosphorus compounds (3) and phenanthraquinone (4) and to elucidate their structures by a combination of 'H, 13C and 31P nmr.…”

Reductive (3 + 2) Annulation of Benzils with Pyrylium Salts: Stereoselective Access to Furyl Analogues of cis-Chalcones

“…Hinted by reactions of phosphines with pyrylium salts, , tris­(dimethylamino)­phosphorus, and benzil were first dissolved in CH 3 CN with stirring for 5 min at rt and then subjected to 2,6-diphenylpyrylium tetrafluoroborate 2 . Upon mixing, the light-yellow solution turned red immediately and a large amount of precipitate formed within minutes, from which yellow solid 4 was isolated in 63% yield, along with 11% yield of 4 H -pyran 3 and 15% of the recovered benzil (Scheme ).…”

Crystal and molecular structure of oxyphosphoranes. 9. The spiropentaoxyphosphorane, 2-phenoxy-2,2-o-phenylenemethyl)-2,2-dihydro-1,3,2-dioxaphospholene

“…II, ideal TP. 111.general representation of irregular ("non-TBP") phosphoranes; P and ligand pair (4,5) are on the plane of the paper and ligands of trio (3,1,2) are on successive planes parallel to it.…”