Summavy. The synthesis of the following compounds and reaction products thereof are described : endo, endo-2,5-dihydroxy-9-oxabicyclo[4.2. llnonanc (3-5), epimeric 2,6-dihydroxy-9oxabicyclo[3.3. llnonanes (endo, endo : 6-8, exo, exo : 29-32, and endo, exo : 43-45), and endo, exo-2,7-dihydroxy-9-oxabicyclo[3.3. llnonane (46-50).

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The article contains sections titled: 1. Introduction 2. Fungicidal Antibiotics 3. Inorganic Compounds 4. Organometallic and Metal–Organic Compounds 5. Dithiocarbamates 5.1. Metal‐Free Dithiocarbamates 5.2. Metal‐Containing Dithiocarbamates 6. Imides 7. Amides 8. Dicarboximides 9. Aliphatic Compounds 10. Phenyl‐Substituted Compounds 11. Organophosphates 12. Phosphites 13. Benzimidazoles 14. Anilides 15. Acylamino Acids 16. Amides 17. Inhibitors of Sterol Biosynthesis 17.1. Triazoles 17.2. Imidazoles 18. Pyridines 19. Pyrimidines 20. Pyrroles 21. Morpholines 22. Strobulins 23. Carbamates 24. Dinitrophenols 25. Oxazoles 26. Quinolines 27. Quinones 28. Quinoxalines 29. Thiazoles and Thiazolidines 30. Thiocarbamates 31. Triazines 32. Unclassified Fungicides

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Bromination of the dichlorovinyl group of cypermethrin yielded a new compound which is a highly potent insecticide. This dibromo adduct has four asymmetric centres and therefore can exist as a mixture of 16 stereoisomers. To establish the influence of the absolute configuration at the chiral centres on the biological activities of these isomers, each of the isomers was isolated; their insecticidal activities against larvae of Heliothis cirescens, and adult Calliphora erythrocephala and Blattella germanica were then determined and compared with those of (S)-cr-cyano-3phenoxybenzyl (1R)-cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropanecarboxylate (deltamethrin NRDC 161), of fenvalerate, and of the eight stereoisomers of cyper methrin.