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1. Bis(9-triptycyl)amines, a missing link between the corresponding methanes and ethers. An unconventional synthesis and influence of nitrogen configurational inversion on the coupled disrotatory trajectory
Yuzo Kawada, Hiroshi Yamazaki, Gen Koga, Shigeru Murata, Hiizu Iwamura
J. Org. Chem., 1986, 51 (9), pp 1472–1477
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http://dx.doi.org/10.1021/jo00359a016P. Spagnolo, P. Zanirato, S. Gronowitz
J. Org. Chem., 1982, 47 (16), pp 3177–3180
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http://dx.doi.org/10.1021/jo00137a033