A kinetic analysis of the protolysis reactions of di‐ and trimethylammonium ions in aqueous solution has been carried out using the nuclear magnetic resonance technique. The results complement those of a similar study of methylammonium ion reported on in an earlier paper. In the pH range studied (between 3 and 5) the main mechanism is: RNH++RN⇆RN+RNH+. The reaction involves water in nearly every exchange. The measured rate constants are: 6.0×108 and 3.1×108 sec—1M—1 for di‐ and trimethylammonium, respectively.

1.
Grunwald
,
Loewenstein
, and
Meiboom
,
J. Chem. Phys.
27
,
630
(
1957
).
For a preliminary report see
Grunwald
,
Loewenstein
, and
Meiboom
,
J. Chem. Phys.
25
,
382
(
1956
).
2.
C. G.
Swain
and
M. M.
Labes
,
J. Am. Chem. Soc.
79
,
1084
(
1957
).
3.
Swain
,
McKnight
, and
Kreiter
,
J. Am. Chem. Soc.
79
,
1088
(
1957
).
4.
Gutowsky
,
McCall
, and
Slichter
,
J. Chem. Phys.
21
,
279
(
1953
).
5.
Brown
,
Bartholomay
, and
Taylor
,
J. Am. Chem. Soc.
66
,
435
(
1944
).
6.
R. N. Beale, J. Chem. Soc. 4494 (1954).
7.
A. F. Trotman‐Dickenson, J. Chem. Soc. 1293 (1949).
8.
Haggis
,
Hasted
, and
Buchanan
,
J. Chem. Phys.
20
,
1452
(
1952
).
9.
J. E.
Leffler
,
Science
117
,
340
(
1953
).
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