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• 6 membered ring
• 3 membered ring
• 3 membered heterocyclic compounds

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• 4 membered heterocyclic compounds
• 5 membered ring with 2 nitrogen
• 7 membered ring

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• 7 membered heterocyclic compounds
• 5 membered ring

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Rh-catalyzed reagent-free ring expansion of cyclobutenones and benzocyclobutenones – Chemical Science (RSC Publishing) DOI:10.1039/C5SC01875G – #39

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• fused ring heterocyclic compounds
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Bond Strength – #111

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• 5 membered carbon ring
• 4 membered carbon ring
• 6 membered heterocyclic compounds

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• five membered heterocyclic compound
• 5 membered ring with 2 oxygens
• 6 membered ring with 2 nitrogen

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Houben-Weyl Methods in Organic Chemistry: Carbocyclic Three- and Four-Membered Ring Compounds: 9783540754114: Medicine & Health Science Books @ Amazon.com – #133

Draw the cyclic five member ring structure of furan? – #134

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The Williamson Ether Synthesis – Master Organic Chemistry – #136

Palladium-catalysed C–H activation of aliphatic amines to give strained nitrogen heterocycles | Nature – #137

True or False. A four-membered ring ether, known as oxacyclobutan… | Channels for Pearson+ – #138