Guanidinium Ions. I. A Nuclear Magnetic Resonance Study of Proton Exchange in Methylguanidinium Salts<sup>1,2</sup>

Lowe, J. U.; Barefoot, Rupert D.; Tompa, Albert S.

doi:10.1021/jo01348a049

Cited by 5 publications

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“…For urea, the Blizzard-Santry calculation gives values of -25.6 Hz and +3.0 Hz for the contact and orbital contributions respectively for an overall 'J(CN) = -22.6 Hz. These 13 results are consistent with recent suggestions that the Blizzard-Santry approach is useful for calculations of carbon-nitrogen coupling constants." The poor fit of the 'J(NH) value very possibly reflects the neglect of solvent interactions in the calculations.…”

Section: Resultssupporting

confidence: 92%

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

et al. 1977

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Section: Resultssupporting

confidence: 92%

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

et al. 1977

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¹H NMR Studies on Cationic Dynamics in Solid Methylguanidinium, 1,1‐Dimethylguanidinium, 1,2,3‐Trimethylguanidinium, and 1,1,3,3‐Tetramethylguanidinium Chlorides

Furukawa

Kojima

Nakamura

1989

Ber Bunsenges Phys Chem

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Molecular Dynamics / Phase TransitionsThe temperature dependence of 'H NMR second moments and spin-lattice relaxation times, Tl and TI, in the laboratory and rotating frames, respectively, were observed for solid methylguanidinium (MeguH +), 1,l-dimethylguanidinium (1,l -MezguH +), 1,2,3-trimethylguanidinium (1 ,2,3-Me3guH +), and 1,1,3,3-tetramethylguanidinium (1,1,3,3-Me4guH+) chlorides. Phase transitions were found for (1,l-MezguH)Cl and (1 ,2,3-Me3guH)C1 at 400 and 409 K, respectively, which were confirmed by differential thermal analysis experiments. Below room temperature, rapid C, reorientational motions of CH, groups were detected for the all cations in the above crystals. The activation energy for the motion of each CH, group in the cations was evaluated. Above room temperature, the temperature dependences of Ti, were determined against T -' for (l,l-MezguH)C1, (1,1,3.3-Me4guH)C1, and their partially deuterated (NH2 + ND2) analogs. For these salts. 'H T,, minima were observed and could be interpreted as arising from the 180' flip motions of the NMe2 group and also of the whole cation for (l.l-Me2guH)C1 and its deuterated analog about the C+-NMe2 axis of the cations, and the whole cationic 1 8 0 flip motion about the C' -NH, or C' -ND, bond axis of the cation for (1,1,3,3-Me4guH)C1 or its deuterated analog, respectively, in addition to the NMez 1 8 0 flip motions. Spectroscopy, Nuclear Magnetic Resonance

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Sakaguchi‐ und Fearon‐Reaktion: Die Struktur der Farbstoffe, ihr Bildungsmechanismus und die Spezifität der Reaktion

Heesing

Hoppe

1967

Chem. Ber.

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Guanidinium Ions. I. A Nuclear Magnetic Resonance Study of Proton Exchange in Methylguanidinium Salts^1,2

Cited by 5 publications

References 0 publications

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

¹H NMR Studies on Cationic Dynamics in Solid Methylguanidinium, 1,1‐Dimethylguanidinium, 1,2,3‐Trimethylguanidinium, and 1,1,3,3‐Tetramethylguanidinium Chlorides

Sakaguchi‐ und Fearon‐Reaktion: Die Struktur der Farbstoffe, ihr Bildungsmechanismus und die Spezifität der Reaktion

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Guanidinium Ions. I. A Nuclear Magnetic Resonance Study of Proton Exchange in Methylguanidinium Salts1,2

Cited by 5 publications

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Nitrogen‐15 n.m.r. studies of 13C, 15N labeled arginine

Nitrogen‐15 n.m.r. studies of 13C, 15N labeled arginine

1H NMR Studies on Cationic Dynamics in Solid Methylguanidinium, 1,1‐Dimethylguanidinium, 1,2,3‐Trimethylguanidinium, and 1,1,3,3‐Tetramethylguanidinium Chlorides

Sakaguchi‐ und Fearon‐Reaktion: Die Struktur der Farbstoffe, ihr Bildungsmechanismus und die Spezifität der Reaktion

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Guanidinium Ions. I. A Nuclear Magnetic Resonance Study of Proton Exchange in Methylguanidinium Salts^1,2

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

Nitrogen‐15 n.m.r. studies of ¹³C, ¹⁵N labeled arginine

¹H NMR Studies on Cationic Dynamics in Solid Methylguanidinium, 1,1‐Dimethylguanidinium, 1,2,3‐Trimethylguanidinium, and 1,1,3,3‐Tetramethylguanidinium Chlorides