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13 Cards in this Set

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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

Draw mechanism for addition of Br to diene with HX

The double bond attacks the H in HX then the X attaches

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

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)

What are good electron poor groups in diels alder?

Ketones and CN

What are elctron rich dienes? for diels alder?

Ether, ether with N and just R

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

What can preventa a diels alder?

if the one that looks like a U is in trans position and locked (like in cyclo)

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

What is the difference between cope and clainsen rearrengement?

cope needs all carbons the other needs one oxygen

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

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

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