ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12A INSTRUCTOR: S. CORLETT Chapter 9 Learning Objectives and Terminology (Wade) Naming alkynesinvolves choosing the parent hydrocarbon (the one with the greatest number of carbon containing the triple bond) and changing the ending (-ane) to -yne; If the compound has double bonds too, then it’s the parent + en-yne. Alkynes are characterized as either terminal(R-C≡C-H), with a terminal hydrogren or as internal (R-C≡C-R), without the hydrogen. Commonly alkynes are called acetylenes.The carbon-carbon double bond is ~1.20 Å long, the shortestfor C-C bonds, and is the strongest, 837 kJ/mol (~226 kJ/mol needed to break 1stpi bond), C-C bond. The hybridization is spfor each carbon and explains the linear geometry about the alkynes carbons. Physical properties such as density (~0.7 g/mL) and bp vary and parallel the corresponding paritally saturated (alkenes) and fully saturated (alkanes) hydrocarbons.
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