Propyl- -cyclopentane

Phenyl cyclohexane 6-Pinene 1,2-Propanediol /r-Propanol Propylbenzene Propyl cyclopentane Propyldecane Styrene Tetradecane Toluene... 

Begiinstigend fiir eine C—O-Hydrogenolyse ist auch hier die sterische Abschirmung (d. h. hoher Substitutionsgrad) der C=C-DoppeIbindung. So entsteht z. B. aus 3,5-Di-oxo-4-(l-athoxy-propyliden)-cyclopenten mit Palladium in Athanol unter Erhalt beider Carbonyl-Funktionen 2,5-Dioxo-l-propyl-cyclopentan (60% d.Th.)1 ... 

The above cited example vividly shows the inversion of configuration of cis-5-hydroxy-2-propyl cyclopentane into tmns—isomer via step-1 through step-3. 

Step-1. The cis-5-hydroxy-2-propyl cyclopentane on being treated with p-tosyl chloride ii.e., p-toluene sulphonyl chloride) in the presence of dry pyridine yields the corresponding cis-tosyl derivative. 

Step-3. The trans-acetyl derivative is subjected to hydrolysis in an alkaline medium and subsequent treatment with a HgO+ gives the desired trans-5-hydroxy-2-propyl cyclopentane. 2.4.1.2 Ionic Additions to C—C Double Bonds. It has been observed that the ionic additions to C—C double bonds invariably proceed stereospecifically by means of anti-addition and regiospecifically following Makovnikov orientation. However, one must take into consideration the various conformational factors in the course of reactions involving cyclic alkenes. 

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