2-Methyl-Cis-2-trans-4-hexadiene

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Presentation transcript:

2-Methyl-Cis-2-trans-4-hexadiene Warm-up 2-Methyl-Cis-2-trans-4-hexadiene Draw in kekule Draw in Bow-tie

Rx of unsaturated HC

Reactions of Alkenes and Alkynes Double/triple bond are unstable they make alkenes/alkynes very reactive. Two classes of Rx: Addition Rx: double bonds break open allowing addition of new elements to alkane Polymerization Rx: double bonds break open connecting monomers

Four types of Addition Rx Hydrogenation –addition of H2 Hydration –addition of H2O Halogenation – addition of F, Cl, Br, I Acid hydration – addition of a HCl, H2SO4

Hydrogenation Rx Breaking a double bond in presence of H2-gas Alkene becomes Alkane

Hydration Rx Breaking a double bond by inserting H2O in form of –OH and H Manufacturing of industrial Alcohols Ethene Ethanol

Halogenation Rx Breaking the double bond with Halogen gasses Production of Haloalkanes

Acid Hydration Rx Acid (HCl) breaks into H+ and Cl- which are added to the new open bond Another way of producing Haloalkanes CH2 =CH2 + HCl H Cl H C C H H H

Polymerization connecting small monomers to large polymers using distinct Rx Natural polymers: cellulose, starch, proteins, DNA Polymerizing Rx is a Dehydration Rx: a reaction that splits out water (opposite of hydration)

Synthetic Polymerization Polymerization Rx: breaking double bonds to connect monomers Use of small alkene monomers Name of polymer: “Poly”alkenename

Blowmolding plastic bottle manufacturing

PE-Polyethylene

Polyvinylchloride-PVC Hard, very stable plastic Problem: leaks Cl2 or HCL gas when combusted or when it corrodes

Styrofoam Polystyrene

Oh yes….alkenes, -ynes combust too Write the balanced combustion of Propane Propene Propyne

Warm-up Ethene is a gas and Polyethene (= polyethylene) is the clear solid plastic bottles are made out of. What causes this phase change? Write a paragraph….