compounds - TOPIC 2 ORGANIC COMPOUNDS(Chapter 2 CHEM 2311 B...

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CHEM 2311 B Topic 2 slide 1 TOPIC 2. ORGANIC COMPOUNDS (Chapter 2) CHEM 2311 B Topic 2 slide 2 OBJECTIVES 1. Describe the structure of N, O and halogen containing functional groups: formal charges, hybridization, VSEPR theory, polarity, resonance. 2. Develop relationships between structure and physical properties (b.p., solubility).
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CHEM 2311 B Topic 2 slide 3 A BRIEF INTRODUCTION TO ChemDraw, Chem3D and MOLECULAR MECHANICS ChemDraw Bond-line structures Chem3D 3D structures: ball-and-stick, space-filling N O O O O CHEM 2311 B Topic 2 slide 4 HYDROCARBONS Molecules containing only C, H C-C bond bond energy length / Å kcal/mol alka nes 1.55 88 alke nes 1.33 152 alky nes 1.20 200 arenes 1.40 115 C C C C C C S:2.1-2.2
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CHEM 2311 B Topic 2 slide 5 Molecular structure of benzene Validating resonance theory C C C C C C H H H H H H C C C C C C H H H H H H H H H H H H H H H H H H CHEM 2311 B Topic 2 slide 6 BRANCHED ALKANES, CLASSIFICATION OF CARBON ATOMS, ALKYL GROUPS Prob: 2.20-27, 32,39,42 S:2.5 Linear alkane Branched alkanes Classification of carbon atoms R = carbon, X C Note the number of alkyl groups attached to the carbon to which the “X” is attached C H 3 X C H 2 X R C H X R R C X R R R C R R R R H 3 C CH 2 CH 2 CH 2 CH 3 CH 3 CH CH 2 C H 3 C CH 3 H 3 C CH 3 CH 3 CH 2 CH 2 CH 2 H 3 C H 2 C CH 3
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CHEM 2311 B Topic 2 slide 7 Alkane Alkyl group CH 4 X CH 3 methyl, Me methane CH 3 CH 3 X CH 2 CH 3 ethyl, Et ethane CH 3 CH 2 CH 3 X CH 2 CH 2 CH 3 propyl, Pr, n -Pr, 1-propyl propane X CH(CH 3 ) 2 isopropyl, i -Pr, 2-propyl CH 3 CH 2 CH 2 CH 3 X CH 2 CH 2 CH 2 CH 3 butyl, Bu, 1-butyl butane X CH 3 CHCH 2 CH 3 sec -butyl, s- Bu, 2-butyl CHEM 2311 B Topic 2 slide 8 phenyl, Ph, Φ benzyl, Bn vinyl X CH 2 X H 2 C CH X H 3 C C CH 3 CH 3 H H 2 C C CH 3 CH 3 H X H 3 C C CH 3 CH 3 X isobutyl, i-Bu isobutane tert -butyl, t-Bu
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