phosphoranes

https://doi.org/10.1351/goldbook.P04567
The mononuclear @H02904@ PH5 , systematically named \(\lambda ^{5}\)-phosphane, and its hydrocarbyl derivatives. By extension, the literature also applies the term to @P04563@.
See also:
phosphanes
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1358 [Terms] [Paper]