A Manual of the Chemistry of the Carbon Compounds

THE CARBON COMPOUNDS. 07
dibasic methylphosphinic acid PO8(CH3)H2 being formed, a white
crystalline mass, readily y soluble in water, and possessing an acid taste.
Dimthylphosphine CH.VP.—The H.VP.— hydrio&ide of this base is
formed together with methylphosphine, hlh and remains behind after the
addition of water in combination with zinc iodide :—
2CHSI + PH4I + ZnO = (CH^HP.HI, Znl4 + HjO
This double compound is decomposed by caustic potash, and the
free base obtained as a colourless liquid boiling at 25°. Exposed to
the air it takes fire, and burns with a luminous phosphorus-like flame.
By the action of nitric acid it is converted into dimethylphospbioic
acid POJCHgJgH, which is monobasic and forms a white crystalline
mass melting at 76° and volatilizing at a higher temperature without
decompositioa
CH3)
TrimtJt/ylpltospMne CH8J-P ia formed by tlxe action of zinc
^H8j
methyl upon phosphorus trichloride. It is a colourless liquid, boiling
at 40° and possessing a peculiar penetrating smell It combines with
methyl iodide to form tetmmethjlpiwsphoniurii iodide P(CH,)4I, white
crystals, the solution of which is decomposed by moist silver oxida
with the formation of the strongly alkaline and caustic hydroxide
P(CH.)4OH. The iodide is also formed together with trimethylphospnine
hydriodide by heating methyl alcohol with phoaphonhira
iodide in sealed tubes :—
3°^ 10 + PH4I = (CH^P, HI + 3** j 0
0 + PH4I« (CI^PI + 4*J J 0
ABSENIC BASKS OP METIIYL.
The compounds of methyl with arsenic may lie considered as being
derived from arsenic trichloride:—
c
Arsonio Trichloride. Areenraothyl Dichlorido. Di
fCl fCH3 fC
s-^ Cl l
(ci
As-^ A^ Cl '
(ci ci
Arwndimothyl CMorido. Arsentrimotliyl.
fCHs
rCH,
As-JCHg
A8 y y
i9M3
ICl (CH,