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Phosphonium
The
phosphonium
(more obscurely:
phosphinium
)
cation
describes
polyatomic cation
s with the
chemical formula
. Salts of the parent PH
4
+
are rarely encountered, but this ion is an intermediate in the preparation of the industrially useful
tetrakis(hydroxymethyl)phosphonium chloride
:
PH
3
+ HCl + 4 CH
2
O → P(CH
2
OH)
4
+
Cl
−
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