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CHMY 211 Week 3 Class notes

by: Bronwyn

CHMY 211 Week 3 Class notes CHMY 211-001


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About this Document

Include lecture notes from 9/12-9/16
Elements of Organic Chemistry
Kristian H. Schlick
Class Notes
Organic Chemistry
25 ?




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This 2 page Class Notes was uploaded by Bronwyn on Friday September 16, 2016. The Class Notes belongs to CHMY 211-001 at Montana State University taught by Kristian H. Schlick in Fall 2016. Since its upload, it has received 13 views. For similar materials see Elements of Organic Chemistry in Organic Chemistry at Montana State University.


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Date Created: 09/16/16
9/12 ­ 2.2 Equilibrium, Lewis Acids and Bases  ● Predicting Equilibrium  ○ pKa​ ­­­ equilibrium moves to weaker acid  ○ Relative stability of bases ­­­ equilibrium moves to more stability  ● Predicting most acidic proton = CARDIO    9/13 ­ 3.1 Alkanes, Isomers  ● Alkanes = single bonded, saturated hydrocarbons  ○ Naming  1. Parent chain = longest C chain w/ most substituents  C ring = “cyclo­”; can be either parent or substituent  2. Identify substituents = end in “­yl”  Complex branches = name parent substituent then side group  3. # the C to have locate substituents w/ lowest numbers (or by alphabet)  4. Form name w/ substituents listed alphabetically  ● #s  1. Meth­  2. Eth­  3. Prop­  4. But­  5. Pent­  6. Hex­  7. Hept­  8. Oct­  9. Non­  10. Dec­  ● Isomers ­ same formula, different connectivity; can be a rotation of the same compound    9/15 ­ 3.2 Newman Projections  ● Newman Projections  ○ Drawn directly down C­­C bond axis  ■ Front C is a dot where the lines meet, Back C is a circle  ● Rotational Conformation  ○ dihedral/torsional angle = angle between H on adjacent C  ○ Staggered conformation = lowest energy  Eclipsed conformation = highest energy  ○ Torsional strain = energy difference between staggered and eclipsed  ­​ ○ Anti conformation ­ large e​ density groups are furthest apart  Gauche conformation ­ less stable than anti; e​ density groups are close    9/15 ­ 3.3 Cycloalkanes  ● Cyclic Alkanes  3​ o​ ○ C in tetrahedral (sp​ ) wants 109.5​  angle  ○ Cyclic angles  o ■ Cyclopropane = 60​   Cyclobutane = 90​   Cyclopentane = 108​   o Cyclohexane = 120​   Cycloheptane = 129​   o  Cyclooctane = 135​ ○ Angle strain = strain on angles when bond angles aren’t ideal (e​ density isn’t  optimal)  ● Cyclohexane  ○ 0 ring strain in optimal conformation  ○ Chair = optimal conformation  ○ Other conformations = half chair, twist boat, boat  ● Drawing chairs  ○ 3 sets of parallel lines  ○ Axial = straight up/down, line up with axis of rotation  ○ Equatorial = parallel to chair lines  ● Chair Flipping  ○ C­­C bond rotation  ○ Axial and equatorial swap positions  ○ Substituents = equatorial positions for stability 


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