ORGANIC CHEMISTRY. VITALISM Vitalism was the belief that certain chemicals, ORGANIC CHEMICALS ORGANIC CHEMICALS, could only be made by living organisms.

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Presentation transcript:

ORGANIC CHEMISTRY

VITALISM Vitalism was the belief that certain chemicals, ORGANIC CHEMICALS ORGANIC CHEMICALS, could only be made by living organisms. INORGANIC CHEMICALS were found primarily in the earth as mineral deposits, but could also be prepared by man. (prominent idea of the 1700’s)

Friedrich Wohler (German), 1828 Synthesized Urea (organic) from ammonium chloride and silver cyanate (inorganic) ….. defeated the vitalism idea inorganicorganic.. Critical Experiment ….. NH 2 C NH 2 O NH 4 + AgNCO Cl Δ

I challenge you to find a single item in this lecture room, your dorm room, your car or your house ….. that hasn’t seen the influence of an organic chemist - paints, varnishes, waxes, finishes (acrylics, latex, silicones) - plastics (formica, vinyl, polystyrene, polyurethane, PVC) - adhesives (contact cements, epoxy resins, cyanoacrylates) - fabrics (nylon, acetates, synthetics, dyes, brighteners) - synthetic carpets, mats - foods (packaging, coloring, preservatives) - medicines, vitamins, pharmaceuticals - gasoline, oils, lubricants, solvents - paper, cardboard - rubber, tires, elastomers

10’s millions organic compounds 1.5 million inorganic compounds Contain C & H plus a few other elementsContain ALL the elements

The great diversity of carbon compounds makes carbon a natural element on which to base complicated LIVING SYSTEMS UNIQUE MOLECULES CAN BE FOUND TO CODE EVERY BIOCHEMICAL PROCESS

Why is carbon the chosen element on which to base living systems? WHY CARBON?

1. Carbon FORMS COVALENT BONDS 2. Carbon FORMS BONDS WITH ITSELF | | | -C-C-C- | | | 1.2 BONDING PROPERTIES OF CARBON

Carbon is one of the few elements that can form chains C-C-C-C-C-C-C-C-C Carbon can also form BRANCHED NETWORKS and RINGS C CC CC CCCCC CCC CC 1.2 BONDING PROPERTIES OF CARBON (continued)

3. Carbon IS TETRAVALENT (4 SINGLE covalent bonds) sp 3 C 1.2 BONDING PROPERTIES OF CARBON (continued)

The tetrahedral shape of carbon o A carbon with 4 single bonds is known as: sp 3

3. Carbon IS TETRAVALENT (4 SINGLE covalent bonds) sp 3 C 1.2 BONDING PROPERTIES OF CARBON (continued) Carbon IS TETRAVALENT (2 SINGLE & 1 DOUBLE covalent bond) sp 2 C Carbon IS TETRAVALENT (1 SINGLE & 1 TRIPLE covalent bond) sp C

H C NOF PSCl Br I 4. COVALENTLY BONDS WITH A FEW OTHER COMMON ELEMENTS (H N O P S F Cl Br I ) UNIQUE PROPERTIES OF CARBON (continued) How many covalent bonds are formed with these atoms?

SUMMARY 1.Carbon forms covalent bonds 2.Carbon bonds to itself 3.Carbon forms 4 bonds (tetravalent) 4.Bonds are single, double or triple 5.Carbon bonds to other elements UNIQUE PROPERTIES OF CARBON (continued)

ORGANICINORGANIC Liquidsolid Low melting/boiling ptHigh melting/boiling pt Non-polarPolar VolatileNon-volatile FlammableNon-flammable Low water solubilityHigh water solubility Non-electrolyte (molecular in water) Electrolyte (ionic in water)

GENERAL CHEMISTRY TOPICS THAT APPLY TO ORGANIC CHEMISTRY Lewis structures (covalent compounds) VSEPR (covalent compounds)  Shapes  Bond angles

Polarity of Organic Molecules  electronegativity of bonded atoms  shape and symmetry of polar bonds Intermolecular forces  London forces  Dipole-dipole  H-boinding Acids and bases (pH)

ORGANIC CHEMISTRY The chemistry of carbon / hydrogen containing compounds

STUDY OF ORGANIC CHEMISTRY Learn elements involved Learn bonding Write molecular formulas Write structural formulas from molecular formulas

Determine physical properties, like water solubility and mp and bp Apply this knowledge to biologically important compounds Learn some chemical properties (reactions) STUDY OF ORGANIC CHEMISTRY (cont)

The End