Some articles on phosphorane, phosphoranes:
Phosphorane
... A phosphorane (IUPAC name λ5-phosphane) is a functional group in organophosphorus chemistry with pentavalent phosphorus ... Phosphoranes adopt a trigonal bipyramidal molecular geometry with the two apical bonds longer than the three equatorial bonds ... Phosphoranes of the type R3P=CR2 are more common and more important ...
... A phosphorane (IUPAC name λ5-phosphane) is a functional group in organophosphorus chemistry with pentavalent phosphorus ... Phosphoranes adopt a trigonal bipyramidal molecular geometry with the two apical bonds longer than the three equatorial bonds ... Phosphoranes of the type R3P=CR2 are more common and more important ...