ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12A INSTRUCTOR: S. CORLETT Chapter 9 Learning Objectives and Terminology (Wade) Naming alkynes involves 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 shortest for C-C bonds, and is the strongest , 837 kJ/mol (~226 kJ/mol needed to break 1 st pi bond), C-C bond. The hybridization is sp for 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. Alkynes are very reactive
This is the end of the preview. Sign up
access the rest of the document.