S. Pokharel, S. Rasoul, A. Roks, R. van Leeuwen, M. van Luyn, L.E. Deelman, J.F. Smits, O. Carretero, W.H. van Gilst, and Y.M. Pinto Hypertension 40 2002 155 161
A. Massé, L.H. Ramirez, G. Bindoula, C. Grillon, J. Wdzieczak-Bakala, K. Raddassi, E. Deschamps de Paillette, J.M. Mencia-Huerta, S. Koscielny, P. Potier, F. Sainteny, and P. Carde Blood 91 1998 441 449
The cyclised by-product 1-oxo-1,2-dihydro-pyrrolo[1,2-c]imidazol-3- ylidene is formed using Hg(II) as catalyst in DMF.
26
77955419037
Heterogeneous reaction leads to increased amounts of the side product 1-oxo-1,2-dihydro-pyrrolo[1,2-c]imidazol-3-ylidene.
Heterogeneous reaction leads to increased amounts of the side product 1-oxo-1,2-dihydro-pyrrolo[1,2-c]imidazol-3-ylidene.
27
77955427943
Note
4 as the reference compound (Φ=0.546).
28
77955419952
Note
a value of the pyrrole guanidinium groups is 6.5. See Supplementary data.
29
77955413402
In pure methanol the crown ether binds this ammonium guest weakly (log K (2)=2.2 and log K (6b)=2.3)
In pure methanol the crown ether binds this ammonium guest weakly (log K (2)=2.2 and log K (6b)=2.3).
30
77955413084
Note
Sodium is not bound by the crown ether (21-crown-7). Even if a 2000 fold excess is added in aqueous methanol no change in luminescence can be observed.
The amino acid Glu is used instead of Asp due to synthetic reasons. The structural difference should not influence the selectivity and binding strength to a large extent.
33
0000484499
J.L. Fauchere, and V. Pliska Eur. J. Med. Chem. 18 1983 369 375
The crown ether binding affinity for ammonium ions in aqueous solution is known to be small (log K<2) V. Rüdiger, H.-J. Schneider, V.P. Solov'ev, V.P. Kazachenko, and O.A. Raevsky Eur. J. Org. Chem. 8 1999 1847 1856
The free base was prepared from the hydrochloride by shaking its chloroform solution several times with an aqueous solution of potassium carbonate (2 M). The combined aqueous phases were re-extracted three times with chloroform.
40
0007161484
The splitting of some signals in the spectrum indicates the presence of unequal populations of two conformers at room temperature. This observation caused by hindered rotation in the molecule is literature known: D.R. Dalton, K.E. Ramey, H.J. Gisler Jr., L.J. Lendvay, and A. Abraham J. Am. Chem. Soc. 91 1969 6367 6370 and literature therein