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33846644444
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The Me groups at the 4- and 5-positions are believed to be essential to protect the structures from possible side reactions
-
The Me groups at the 4- and 5-positions are believed to be essential to protect the structures from possible side reactions: a) M. Tamm, D. Petrovic, S. Randoll, S. Beer, T. Bannenberg, P. G. Jones, J. Grunenberg, Org. Biomol. Chem. 2007, 5, 523-530;
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R. Schwesinger, H. Schlemper, C. Hasenfratz, J. Willaredt, T. Dambacher, T. Breuer, C. Ottaway, M. Fletschinger, J. Boele, H. Fritz, D. Putzas, H. W. Rotter, F. G. Bordwell, A. V. Satish, G.-Z. Ji, E.-M. Peters, K. Peters, H. G. von Schnering, L. WaIz, Liebigs Ann. 1996, 1055-1081.
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43
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-
70349294486
-
-
The chloride salt is commercially available from Fluka-Chemie AG (Switzerland).
-
The chloride salt is commercially available from Fluka-Chemie AG (Switzerland).
-
-
-
-
44
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14944363256
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The steadily developing chemistry of these compounds has been summarized in recent review articles: references therein
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For the synthesis of 5 from 4, we found it advantageous to use Na/K alloy in refluxing glyme instead of K. in THF as it provides higher conversions in shorter reaction times.
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N. Kuhn, T. Kratz, Synthesis 1993, 561-562. For the synthesis of 5 from 4, we found it advantageous to use Na/K alloy in refluxing glyme instead of K. in THF as it provides higher conversions in shorter reaction times.
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50
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0038394495
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The chemistry and coordinating properties of the conjugated bases, 2-iminoimidazolines, have been reviewed: For original experimental results indicating high basicity and nucleophilicity of the exocyclic N. atom
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The chemistry and coordinating properties of the conjugated bases, 2-iminoimidazolines, have been reviewed: a) N. Kuhn, M. Gönner, M. Grathwohl, J. Wiethoff, G. Frenking, Y. Chen, Z. Anorg. AlIg. Chem. 2003, 629, 793-802. For original experimental results indicating high basicity and nucleophilicity of the exocyclic N. atom, see:
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ref.[9a]
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h) N. Kuhn, H. Kotowski, J. Wiethoff, Phosphorus Sulfur Silicon Relat. Elem. 1998, 133, 237-244; ref.[9a].
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59
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70349285288
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-
CCDC729001 (8a), 729002 (1a-OTs), and 729003 (1b-I) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via
-
CCDC729001 (8a), 729002 (1a-OTs), and 729003 (1b-I) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data-request/cif
-
-
-
-
60
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-
70349297663
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-
3P=NTMS equally well.
-
3P=NTMS equally well.
-
-
-
-
61
-
-
70349274496
-
-
4P-Cl in 50% NaOH/PhCl at110°C has been reported to be 33 h.[4]
-
4P-Cl in 50% NaOH/PhCl at110°C has been reported to be 33 h.[4]
-
-
-
-
62
-
-
70349288443
-
-
The insignificance of Hofmann degradation in alkaline cleavage of cations with extended resonance conjugation was noted earlier by Schwesinger et al.[4
-
The insignificance of Hofmann degradation in alkaline cleavage of cations with extended resonance conjugation was noted earlier by Schwesinger et al.[4)
-
-
-
-
63
-
-
70349294485
-
-
3 carbons of the isopropyl groups and each C1/C4 centre are relatively short and fall in a narrow range from 3.1 to 4.1 Å.
-
3 carbons of the isopropyl groups and each C1/C4 centre are relatively short and fall in a narrow range from 3.1 to 4.1 Å.
-
-
-
-
64
-
-
70349299243
-
-
The dihedral angle ranges from 52.9(2)° to 58.3(2)° for three symmetrically independent cations observed in the crystal structure of Ib-I.
-
The dihedral angle ranges from 52.9(2)° to 58.3(2)° for three symmetrically independent cations observed in the crystal structure of Ib-I.
-
-
-
-
65
-
-
84982059939
-
-
2F under atmospheric pressure
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2F under atmospheric pressure: a) H. Weber, J. Pant, M. Liedigk, H. Wunderlich, Chem. Ber. 1981, 114, 1455-1463;
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Weber, H.1
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66
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0012440132
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It was conjectured that the protonation occurs due to aelimination from the methylating agent or hydrolysis by traces of stray moisture
-
b) C. J. Hou, Y. Okamato, J. Org. Chem. 1982, 47, 1977-1979. It was conjectured that the protonation occurs due to aelimination from the methylating agent or hydrolysis by traces of stray moisture.
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Hou, C.J.1
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21344480853
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Spectral data of the intermediate 9 are in good agreement with those reported in the literature
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Spectral data of the intermediate 9 are in good agreement with those reported in the literature : J. R. Goerlich, M. Farkens, A. Fischer, P. G. Jones, R. Schmutzler, Z. Anorg. AlIg. Chem. 1994, 620, 707-715.
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(1994)
Z. Anorg. AlIg. Chem.
, vol.620
, pp. 707-715
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Goerlich, J.R.1
Farkens, M.2
Fischer, A.3
Jones, P.G.4
Schmutzler, R.5
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