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35649010649
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note
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The chiral crystals were obtained by complexation of bisguanidinobenzene 1 and (2S,3S)-(+)-O,O′-dibenzoyltartaric acid. In these crystals, only one enantiomer of the trans form of 1 exists. Surprisingly, the chiral crystal was also obtained from the complex of 1 and achiral benzoic acid and water. In these crystals, the complex formed a helical supermolecule carrying only the trans enantiomer of 1. The chirality disappeared when the crystal was dissolved in a solvent. These results will be reported elsewhere in the near future.
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35648929623
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note
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Details of the crystal structure analyses are provided as Supplementary data. CCDC 654529 (1), CCDC 654532 (2a), CCDC 654536 (P-2b), CCDC 654531 (M-2b), CCDC 654530 (M-2c recrystallized from MeOH), CCDC 654535 (P-2c), CCDC 654534, (M-2c), and CCDC 654533 (2d) contain the supplementary crystallographic data for this Letter. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
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30
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35649001704
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note
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Attempts to synthesize dialkylated bisguanidinobenzene were not successful. Treatment of N,N′-dimethyl-o-diaminobenzene with 4 afforded an undesired product through intermolecular reactions.
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32
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0000817728
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From dynamic studies on guanidines, it is known that both the C{double bond, long}N and Ar-N bonds rapidly rotate at rt. See:
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From dynamic studies on guanidines, it is known that both the C{double bond, long}N and Ar-N bonds rapidly rotate at rt. See:. Kessler H., and Leibfritz D. Tetrahedron Lett. 6 (1969) 427
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Kessler, H.1
Leibfritz, D.2
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