Chapter 7 handouts

Chapter 7 handouts - Chapter 7 Structure and Synthesis of...

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Chapter 7 Structure and Synthesis of Alkenes
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Chapter 7 2 Functional Group • __________ is the functional group. • More reactive than __________. • Bond dissociation energies: ¾ C=C BDE 146 kcal/mol ¾ C-C BDE 83 kcal/mol ¾ Pi bond _________
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Chapter 7 3 Orbital Description • Sigma bonds around C are ___ hybridized. • Angles are approximately ____ degrees. • No ____________ electrons. • Molecule is _______ around the double bond. • Pi bond is formed by the sideways overlap of parallel ________ perpendicular to the plane of the molecule.
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Chapter 7 4 Bond Lengths and Angles • Hybrid orbitals have more _________ . • Pi overlap brings carbon atoms______. • Bond angle with pi orbitals increases. ¾ Angle C=C-H is ______ ¾ Angle H-C-H is _______
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Chapter 7 5 Pi Bond • Sideways overlap of parallel p orbitals. • No rotation is possible without breaking the pi bond (63 kcal/mole). • Cis isomer cannot become trans without a ____________ occurring, or input of much ________ (photochemical). =>
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Chapter 7 6 Elements of Unsaturation • A saturated hydrocarbon: C n H 2n+2 • Each _______ (and each ___) decreases the number of H’s by two. • Each of these is an element of ________. • To calculate: find number of H’s if it were ________, subtract the ___________ of H’s, then divide by 2.
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Chapter 7 7 Propose a Structure: • First calculate the number of elements of unsaturation. • Remember: ¾ A double bond is one element of unsaturation. ¾ A ring is one element of unsaturation. ¾ A triple bond is two elements of unsaturation. for C 5 H 8
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Chapter 7 8 Heteroatoms • Halogens take the place of hydrogens, so add their number to the number of H’s. • Oxygen doesn’t change the C:H ratio, so ignore oxygen in the formula. • Nitrogen is ________, so it acts like half a carbon. C H H C H H N C H H H
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Chapter 7 9 Structure for C 6 H 7 N?
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Chapter 7 handouts - Chapter 7 Structure and Synthesis of...

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