HYDROCARBONS OF GREATER UNSATURATION

While most of the compounds commonly met with are derivatives of one of the three series of hydrocarbons which have been studied it should be mentoned that hydrocarbons are known which possess still 

Di-propargyl.—The hydrocarbon with the general formula C H2 -6 has the composition CeHe and is known as di-propargyl. It has been shown to contain two triple bonds and is thus a di-ine. Its constitution has been established as a straight chain of six carbons with the triple bonds at carbons i and 5. Its formula is 

It is known as di-propargyl because the group (CH = C—CH2—) is called propargyl (p. 167). The compound is of importance because it is isomeric with benzene which is a cyclic or closed chain hydrocarbon and the mother substance of a large series of compounds constituting Part II of this book. 

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