1. C. Poupat, B. Rodriguez, H.-P. Husson, P. Potier andM.-M Janot, C. r. Acad. Sci., Paris269 C 335 (1969).
2. All known compounds mentioned here had physical properties in accord with the literature values, except this substance which gave a higher optical rotation [α] D 22 + 348° (c 0.086, chloroform). The new compounds has elemental analyses or mass spectral data consistent with the proposed structures.
3. Taken in CDCl3 at 60 MHz with Me4Si as internal standard.
4. Determined on an AEI MS-9 double-focusing mass spectrometer via direct inlet probe.
5. L. M. Jackman andS. Sternhell,Applications of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry, 2nd edn. (Pergamon Press, New York 1969), p. 133.