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Chapter 7-3 - Elements of Unsaturation
Organic Chemistry 307: Chapter 7 - Structure and Synthesis of Alkenes; Section 3 - Elements of Unsaturation
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Organic Chemistry
Undergraduate 3
11/16/2011

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Term
When you need a structure for a particular molecular formula, it helps to find the number of __________ __________ __________.
Calculate the maximum number of __________ atoms from the saturated formula, and see how many are missing.
The number of elements of unsaturation is simply __________ the number of missing __________.
Definition
1) Elements of unsaturation
2) Hydrogen
3) Half
4) Hydrogens
Term
__________ are any atoms other than carbon and hydrogen.
Definition
1) Heteroatoms
Term
Elements of Unsaturation: Halogens
Halogens simply substitute for __________ atoms in the molecular formula.
In calculating the number of elements of unsaturation, simply count halogens as __________ atoms.
Definition
1) Hydrogens
2) Hydrogen
Term
Elements of Unsaturation: Oxygen
An oxygen atom can be added to the chain (or added to a C-H bond to make a C-OH group) without changing the number of __________ or __________ atoms.
In calculating the number of elements of unsaturation, __________ the oxygen atoms.
Definition
1) Hydrogen
2) Carbon
3) Ignore
Term
Elements of Unsaturation: Nitrogen
A nitrogen atom can take the place of a __________ atom in the chain, but since nitrogen is __________, having only one additional __________ atom compared with __________ for carbon, each nitrogen should be counted as __________ a carbon atom when computing elements of unsaturation.
Definition
1) Carbon
2) Trivalent
3) Hydrogen
4) Two
5) Half
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