phosphonium compounds

https://doi.org/10.1351/goldbook.P04562
Salts (and hydroxides) [R4P+]X containing tetracoordinate phosphonium ion and the associated @[email protected]
See:
onium compounds
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]