Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1979-09-10
1981-05-05
Hamrock, William F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
525154, 525157, 525379, 564208, C08F 830, C08F 832
Patent
active
042658357
ABSTRACT:
In a process for preparing a N-substituted derivative of a carboxamide, the conversion of carboxamide to the derivative is determined by carbon-13 nuclear magnetic resonance analysis (CMR) wherein the intensities of the carbonyl carbon peaks attributable to the carboxamide and the derivative are measured under conditions of magnetic resonance and the mole ratio of carboxamide to derivative is determined by comparing the intensities of said carbonyl carbon peaks.
For example, in the reaction of polyacrylamide with a secondary amine such as dimethylamine and formaldehyde, the conversion of the polyacrylamide to its N-(dimethylaminomethyl) derivative is determined by subjecting the sample to CMR analysis and comparing the intensities of the carbonyl carbon peaks of the polyacrylamide and the N-(dimethylaminomethyl) derivative.
REFERENCES:
patent: 2328901 (1943-09-01), Grimm et al.
patent: 3439260 (1969-04-01), Bene et al.
patent: 3862091 (1975-01-01), Barabas et al.
patent: 3925721 (1975-12-01), Petroff
"The Mannich Reaction of Polyacrylamide" McDonald et al., Macromolecules, vol. 12, p. 203 3-1979.
Beaver Robert H.
McDonald Charles J.
Hamrock William F.
The Dow Chemical Company
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