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13 Cards in this Set
- Front
- Back
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Draw mechanism to make dienes |
you have an alkane with Br you treat it with a base. The base removes an H in the carbon next to the Br and a double bond is formed and Br is liberated |
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Draw mechanism for addition of Br to diene with HX |
The double bond attacks the H in HX then the X attaches |
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When you add Br to a diene which product is the kinetic and which one is the thermodynamic |
thermodynamic is when Br is not added to the carbon next to the one that got the H but the double bond moves and makes the Br attach to another carbon |
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Draw mechanism to make diene with two bromines |
double bond attacks one Br in Br2 then the other Br attacks the C with the positive charge (the charge depends on temperature) |
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What are good electron poor groups in diels alder? |
Ketones and CN |
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What are elctron rich dienes? for diels alder? |
Ether, ether with N and just R |
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How to predict position of substituents in diels alder? |
First align them by putting + and - Take endo into account everything to the left is bottom and to the right is top |
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What can preventa a diels alder? |
if the one that looks like a U is in trans position and locked (like in cyclo) |
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after a diels alder with only double bonds how many bonds are in the cyclo? with a triple bond? |
1 and 2 with a triple |
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What is the difference between cope and clainsen rearrengement? |
cope needs all carbons the other needs one oxygen |
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Draw initial and final producst of cope and clainsen |
cope: a carbon ring with two double bonds separated. They opening gets to the opposite side and the two double bonds also move to the opposite site. Continue separated clainsen: same thing but opening always ends at the O |
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Describe aromatic clainsen |
clainsen but attached to an aromatic ring continues as a normal clainsen but it is tautomerized. making the O an OH and completing the aromatic ring again |
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How to calculate uv spectra of a molecule? |
Conjugated diene 200 both bonds inside same ring 40 each extra bond 30 each alkyl group attached 5 if one bond is inside and the other outside a ring 5 |
