CHEM 2OA3 Chapter Notes - Chapter 10: Alkyne, Radical Ion, Syn And Anti Addition
30 Jun 2015
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Suffix of ide : presence of a negative charge. Equilibrium will favour formation of weaker acid and weaker base. Stronger the base, the more it can deprotonate a terminal alkyne. Terminal alkynes are acidic and can be deprotonated with a suitable base. Formed by alkyl halides: has two leaving groups which undergoes 2 successive elimination reactions. Geminal dihalide: 2 halogens connected to the same c. Vicinal dihalide: 2 halogens connected to different c. Poisoned catalysts can convert an alkyne into cis alkene (without further reduction) Electron transfer: single electron transferred to the alkene = radical anion. Addition of h2 is achieved by adding e-, h+, e-, h+ to create anti addition across the alkyn. Produce alkane: alkyne treated with h2 in the presence of metal catalysts (pd, pt, ni) Produce cis alkene: treated with h2 in the presence of a poisoned catalyst (lindlars or ni2b) Prodce trans alkene: treated with na in liquid nh3.
