SATURATED ALI-CYCLIC COMPOUNDS

CsHe Tri-methylene C4H8 Tetra-methylene C5H10 Penta-methylene C6H12 Hexa-methylene 

What are the properties of these compounds and what is their structure which can thus explain their isomerism with the olefines, and the fact that they are not unsaturated The simplest member of the group, viz., CaHe, is known as tri-methylene or cyclo propane. 

Tri-methylene, Cyclo Propane.—It is isomeric with propylene for which the structure has been shown to be CH3—CH = CH2. Now propylene is related to propane in that two hydrogen atoms in propane are lost from two adjacent carbon groups, the two carbons becoming doubly linked. 

The result is accomplished by the loss of two bromine atoms from i-2-di-brom propane when it is heated with sodium. 

If instead of 1-2-di-brom propane we use 1-3-di-brom propane the product is cyclo propane.. 

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Saturated and partially saturated ali cyclic compounds having six-membered rings are readily converted to the corresponding aromatic compounds by several dehydrogenation procedures. The more nearly saturated compounds are the most difficult to dehydrogenate. Alicyclic rings con-... 

All of these ali-cyclic compounds containing double or triple bonds are unsaturated compounds distinctly different from the saturated ali-cyclic compounds. 

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