Chapter 7 - Alkenes and Alkynes Flashcards Preview

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Flashcards in Chapter 7 - Alkenes and Alkynes Deck (19)
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1
Q

Hydrohalogenation across an alkene

A
2
Q

Markovnikov Product

A

H will go to carbon with more H’s on it, and the other substituent will go on the carbon with fewer H’s on it

3
Q

List carbocation stability from greatest to least

A
4
Q

Which types of reactions will add OH or OR to alkenes?

A

acid catalyzed hydration

oxymercuration - demercuration

acid catalyzed alcohol addition

5
Q

Describe what is added, regioselectivity, and whether a rearrangement is possible in acid catalyzed hydration

A
6
Q

Describe what is added, regioselectivity, stereoselectivity, and whether a rearrangement is possible in oxymercuration-demercuration

A
7
Q

Describe what is added, regioselectivity, and whether a rearrangement is possible in acid catalyzed alcohol addition

A
8
Q

Adding a halogen across an alkene will have what type of stereoselectivity?

A

anti

9
Q

T/F? Rearrangements when adding halogens across a double bond are not possible.

A

true

10
Q

What will give products in anti-markovnikov fashion when doing reactions with alkenes?

A

hydroboration-oxidation and hydrobromination with peroxide

11
Q

In hydroboration-oxidation, the product will have ____ stereoselectivity

A

syn

12
Q

When adding nucleophiles to an epoxide under acidic conditions, attack will occur at the ____ ___ position.

In basic conditions, it will attack at the most ___ ____ position

What type of stereoselectivity will it have?

A

acidic = most substituted

basic = least substituted anti

syn

13
Q

In ozonolysis, a workup containing Zn, water, or (CH3)2S will form what kind of product?

If a workup contained just H202, what will the product look like?

A

Zn, H2O, (CH3)2S = one oxygen per carbon

H2O2 = one OH will replace one H

14
Q

In catalytic hydration of alkenes, describe which reagent is used to create an E alkene or a Z alkene

A

E = Na or Li, with NH3

Z = H2 and lindlar catalyst

*E and Z are referring to the H’s being on the opposite or same sides, respectively

15
Q

Differentiate between hydrohalogenation of terminal vs. internal alkynes

A

terminal - addition of HX markovnikov style

internal - two products

16
Q

Describe the product of di-halogenation of an alkyne with one equivalent of the halogen, then with excess.

A

one equivalent - alkene with E addition of the halogen

excess - tetra halide

17
Q

Acid catalyzed hydration of an alkyne will form what kind of product?

A

enol - will tautomerize to form a ketone

18
Q

If an alkyne underwent a hydration through hydroboration-oxidation, what product will form?

How about if the same alkyne underwent an acid catalyzed hydration reaction?

A

hydroboration-oxidation = antimarkovnikov enol, which will tautomerize to an aldehyde

acid catalyzed hydration = markovnikov enole, which will tautomerize to a ketone

19
Q

Alkylation of an alkyne uses ____ as a reagent, which will do nucleophilic attack on a terminal alkyne to create a ______

A

NaNH2, acetylide