1 Molecular Structure

Organic Chemistry: Structure and Function

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1 Molecular Structure: Introduction and Review Lecture supplement: Thinkbook page 4
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2 Goal: Review some relevant concepts from Chemistry 14A and 14B Important ideas that you probably already know
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3 Basic Questions The study of molecules containing carbon Why all this fuss about carbon? Carbon is unique in its ability to form stable chains and rings ---> millions of molecules known from a small set of elements (CHON) Organic chemistry: What is it?
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4 Basic Questions The study of molecules containing carbon Why all this fuss about carbon? Carbon is unique in its ability to form stable chains and rings ---> millions of molecules known from a small set of elements (CHON) Cholesterol HO CH 3 CH 3 Carbon compounds basis for life (as we know it) Organic chemistry: What is it?
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5 Basic Questions Broadly applicable to other fields: biochemistry, pharmaceuticals, biology, etc. Skills learned useful elsewhere: information organization, critical/analytical thinking, etc. How often should I study organic chemistry? Monday , Tuesda y, Wednesday , Thursday , Friday , Saturday , Sunda y… Why should I study organic chemistry?
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6 Basic Questions In Chemistry 14C we expand our knowledge of organic molecular structure by exploring… Selected topics in structural theory : resonance, conjugation, aromaticity, stereochemistry, etc. Laboratory determination of structure : spectroscopy Structure controls properties : physical, chemical, biological Reaction chemistry (substance substance) covered in Chemistry 14D
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7 Basic Questions Molecular structure = electron distribution (in bonds, in molecule) and positions of atoms in space. So then…what is molecular structure ?
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8 Molecular Representations How do we draw molecules? The Rules 2200 is a covalent bond (electron pair shared by two atoms) : is a lone (nonbonded) electron pair Carbons do not always have to be drawn Hydrogens can be omitted only if carbon not written as C All other atoms must always be shown Lone pairs do not always have to be shown Formal charges must always be shown Three-dimensional geometry does not always have to be shown
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9 Molecular Representations How do we draw molecules? The Rules 2200 is a covalent bond (electron pair shared by two atoms) : is a lone (nonbonded) electron pair Carbons do not always have to be drawn Hydrogens can be omitted only if carbon not written as C All other atoms must always be shown Lone pairs do not always have to be shown Formal charges must always be shown Three-dimensional geometry does not always have to be shown indicates bond is projecting towards viewer indicates bond is receding away from viewer
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10 Molecular Representations Applying the rules: Methane is a covalent bond Carbons do not always have to be drawn Formal charges must always be shown Three-dimensional geometry does not always have to be shown Methane Major component of natural gas C H H H H H H H H --or--
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11 Molecular Representations Applying the rules: Methane
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