phosphine
phosphine
Phosphane (PH<small><sub>3</sub></small>) and compounds derived from it by substituting one, two or three hydrogen atoms by hydrocarbyl groups: RPH<small><sub>2</sub></small>, R<small><sub>2</sub></small>PH, R<small><sub>3</sub></small>P (R ≠ H) are called primary, secondary and tertiary phosphines, respectively. A specific phosphine is preferably named as a substituted phosphane.