1. B. Furth, J. Kossanyi, J. P. Morizur and M. Vandewalle, Bull. Soc. Chim. France, 1428 (1967).
2. Di-isophorone and related compounds. Part 9 1-(substituted)aminodi-isophoranes and their cyclodehydration products
3. Diisophorone and related compounds. 20. Diisophoranes incorporating the 1,3-thiazine ring system: 8,11a-methanocycloocta[d,e][3,1]benzothiazines
4. Note on Nomenclature. According to Baeyer's nomenclature of bridged ring structures, which derives the names of compounds from the ultimate saturated homocyclic ring-system (i.e. tetracyclo[9.3.1.11,5O7,15]-hexadecane for C), compound 5 is named 13-imino-3,3,5,9,9-pentamethyl-12,14-diazatetracyclo[9.3.1.11,5, O7,15] hexadeca-6,11(15)-diene. The IUPAC system selects the parent heteroaromatic ring as the basis of the name (here: quinazoline D). Its fusion with a cyclooctane ring, and numbering of the appropriately oriented carbon framework leads to the fully conjugated parent base E and hence to the following name for 5:2,3,4,5,6,8,-9,10,11,11a-decahydro-2-imino-5,5,8,10,10- pentamethyl-1H-8, 11a-methanocycloocta[d, e]quinazoline. Because of the complexity of both approved names, our simplified nomenclature [6-8] recently adapted to comparable hetero-diisophorone patterns [4] is again used. It reflects the formal derivation of the products from hypothetical precursors, e.g. 4, by cyclodehydration, and adheres to the conventional numbering of the carbon framework F, thus facilitating the correlation of all the diisophorone variants so far described, especially their carbon nmr spectra.
5. Diisophorone and related compounds—I