... (2) P. AS Smith, "The Chemistry of Open-Chain Organic Ni- trogen Compounds," Vol. ... (IO) J. M. Lehn, 6. Dietrich, and J. P. Sauvage, Tetrahedron Lett., 2885 (1969). (11) Prepared in 95% yield by the general procedure described in "Organic Syntheses," Collect. Vol. ...