Term
| What are conjugated compounds? |
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Definition
compounds with alternating double and single bonds
-found in pigments responsible for colors of fruit and flowers |
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Term
| What do you call conjugated hydrocarbons with many double bonds? |
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Definition
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Term
When conjugate alkenes react with HBr, HCl, and so on..the first step is protonation of one of the double bonds to form carbocation and then what is formed...? |
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Definition
2 resonance...
1 with positive charge on # 2 carbon
1 with positive charge of # 4 carbon
(1,2 addition and 1,4 addition)
so the ending resulting in somewhere in between |
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Term
| Which addition happends at a temp of 0 degrees celsius? and 40 degrees celius? |
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Definition
0= 1,2 additions
40= 1,4 additions |
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Term
| What is a kinetic product? which reaction is this the result of? |
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Definition
this is a 1,2 addition that has lower activation barrier.
*Cannot return to carbocation intermediate, irreversible |
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Term
| What is a thermodynamic product? |
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Definition
Higher temp rxn that is reversible,
*has enough energy to return to cation and reach equilibrium
*Will aslo favor the lower energy product regardless of hieght of activation barrier
* |
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Term
| What are Diels -alder reactions? |
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Definition
conjugated diens react with alkene (dienophile/diene lover) to form a six membered ring (hexagon)
* 1 step reactions with no intermediates! |
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Term
| Name 3 Good electron-donating groups to put on dienes(EDG): |
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Definition
1.)ethers(OR)
2.)Alcohols (OH)
3.)Amines (NR2) |
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Term
| Name 3 Good electron withdrawing groups for dienophiles: |
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Definition
1.)Cyanogroups (CN)
2.)Nitro Groups (NO2)
3.) Carbonyl Compounds (ester, aldehydes, acids, ketones, and so on..) |
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Term
| What conformation is required for dienes? |
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Definition
S-Cis conformation...Both double bonds are on the same side of C-C single bond that seperate the two double bonds bonds
*2 double bonds are in proper orientation to undergo reaction
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Term
[image]
what is this called? |
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Definition
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Term
| Dien alder reactions are sterioselective..what does that mean? |
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Definition
forms one stereoisomer over another...
Start with cis----end with cis product
Start with trans---end with trans product |
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Term
| What type of additionis used in the polymerization of the growing chain of a conjugated diene monomer? |
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Definition
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Term
| The initator (In) of a polymerization reaction of dienes can either be... |
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Definition
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