1. Parts I and II: see reference 6b.
2. Cazes, B. 1976. Doctorat ès Sciences Physiques Thesis, Pierre et Marie Curie University, Paris VI(; n[ddot] 12725 in the Archives Originales of C. N. R. S.
3. Defensive mechanisms of arthropods. XXIII. An allenic sesquiterpenoid from the grasshopper
4. this procedure has already led to several types of ketones: β. γ-unsaturated6a; enolic monoethers of γ-ketoaldehydes or of γ-diketones6b; orthomethyl aryl ketones6cand elsholtzia ketone6d