Topic_2.3_Alkynes - Unsaturated Hydrocarbon Alkynes Chapter 2.3 Alkynes Nomenclature of Alkynes Properties of Alkynes Synthesis of Alkynes

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Alkynes Nomenclature of Alkynes Properties of Alkynes Synthesis of Alkynes Reactions of Alkynes Unsaturated Hydrocarbon - Alkynes Chapter 2.3
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Alkynes • Unsaturated hydrocarbon • Contain carbon – carbon triple bonds • Alkynes • General formula •Aliphatic hydrocarbons RC CR C n H 2n–2
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Similar to alkanes and alkenes Density Boiling point Melting point Increase as the number of carbon increase. Physical properties Solubility Soluble in nonpolar solvent Not soluble in water Low density,boiling point and melting point Properties vary based on chain size
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Linear
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Naming Alkynes Similar to Alkenes: • Longest chain must contain the triple bond • Number of carbons so that the triple bond has the lowest possible value • Indicate the position of the triple bond • Change ending to - yne
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Synthesis of alkynes
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Synthesis of alkynes Dehydrohalogenation of dihaloalkane 2NaNH 2NaNH 2 X X C C C C X X H H H H R R R R 2NH 2NH 3 + + RC RC CR' CR' + + Geminal dihalide Sodium amide alkyne Ammonia 2Na 2Na X X Sodium halide + + i. Geminal dihalide
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This note was uploaded on 05/08/2011 for the course ACCOUNTING 121210 taught by Professor Sdasdas during the Spring '10 term at Albany College of Pharmacy and Health Sciences.

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Topic_2.3_Alkynes - Unsaturated Hydrocarbon Alkynes Chapter 2.3 Alkynes Nomenclature of Alkynes Properties of Alkynes Synthesis of Alkynes

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