(9) The probe temperature was essentially the same at the melting point of the solid compound. Compounds were shown to be thermally stable at 200 OC, with the exception of 2a, 2f, 8a, and 12a. The m/e 100 peaks in the mass spectra of 121 (26.4% of base) and 12k (48.6% of base) are the only readily apparent artifacts in our results.(IO) T. Kato, H. Yamanaka, and T. Shibita, Tetrahedron, 23, 2965 (1967).(1 1) HL Klopping and HM Loux, ...
