Mechanically directed absolute asymmetric syntheses of helicenes in a twisted nematic mesophase

Journal of the Chemical Society, Chemical Communications

Volumn , Issue 23, 1979, Pages 1086-1087

  Nakazaki, Masao ^a   Yamamoto, Koji ^a   Fujiwara, Kazufumi ^a   Maeda, Miharu ^a  

^a OSAKA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 37049091542     PISSN: 00224936     EISSN: None     Source Type: Journal    
DOI: 10.1039/C39790001086     Document Type: Article

References (8)

1. M. Nakazaki, K. Yamamoto, and K. Fujiwara, Chem. Letters, 1978, 863.
2. A critical account of asymmetric syntheses in cholesteric mesophases has been published by C. Eskenazi, J. F. Nicoud, and H. B. Kagan, J. Org. Chem., 1979, 44, 995.
3. F. D. Saeva and G. R. Olin, J. Amer. Chem. Soc., 1976, 98, 2709.
4. cis-l-Phenyl-2-(2-benzo[e]phenanthryl)ethylene (1), m.p. 138-5—139-5 °C, was prepared by the method of W. J. Bernstein, M. Calvin, and O. Buchardt, J. Amer. Chem. Soc., 1973, 95, 527.
5. M. S. Newman, R. S. Darlak, and L. Tsai, J. Amer. Chem. Soc., 1967, 89, 6191.
6. R. H. Martin and M. J. Marchant, Tetrahedron, 1974, 30, 343.
7. cis-1 -(3-Phenanthryl)-2-(2-benzo[e]phenanthryl)ethylene (3), m.p. 195—196 °C was prepared by the method of W. J. Bernstein, M. Calvin, and O. Buchardt, J. Amer. Chem. Soc., 1972, 94, 494.
8. R. H. Martin, M. Flammang-Barbieux, J. P. Cosyn, and M. Gelbcke, Tetrahedron Letters, 1968, 3507.