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UMB / Chemistry / CHEM 231 / How would one know if a molecule has london dispersion forces?

How would one know if a molecule has london dispersion forces?

How would one know if a molecule has london dispersion forces?

Description

School: University of Maryland
Department: Chemistry
Course: Organic Chemistry I
Professor: Lenea stocker
Term: Fall 2015
Tags: orgo and Organic Chemistry
Cost: 25
Name: CHEM231 Week 5 Notes
Description: These notes cover Newman projections and chair conformers.
Uploaded: 02/25/2016
6 Pages 44 Views 1 Unlocks
Reviews


London Dispersion forces *movement of electron


How do you know if a molecule has london dispersion forces?



density

(CHu

(CHỊ)

less space

for electrons to move around -very

CHU is smaller and has negatively charged - repen

Lecture 2119 Newman projects

30 Structure

rotation We also discuss several other topics like What is the major provisions of the u.s. bankruptcy law and the principle of absolute priority ?

around

c-c.

6 conformers

lower energy is key The view of the molecule is from


What is newman projection formula?



the

front

circle: electron density

*have to have 2 adject Sp3

hybridized carbons. Don't forget about the age old question of Why do we still not believe science?

front carbon

front bonds

-back bonds

ALL CONFORMERS

CH2CH3

I

- CH2 CH3

Br

(H2C

СН2СН3

СН2СН2


How do you make a chair conformer?



CH2 CH3

Eclipsed due to

conformers are ALWAYS less stable than staggered Torsional strain

o as constituents get larger, torsional strain increase Br

H 1 a H CH2CH3 u

ad

Br

CH2CH3

- Don't forget about the age old question of What is the relationship of the individual to society?

CH2CH3 CH2CH3

CH2CH3

H CH2CH3

BDF

ACE

E is most desirable

chair conformers

*ring Strain abond angles) * torsional strain

heat of combuszon estability) If you want to learn more check out What are the causes of international conflicts?

3

4

5

6

7

Cyclohexane is

not flat!

boat

Chairs

thigher

energy

in

klines

supposed to be parallel

axial

equitorial (more space bigger Constituents

VOU

600

STAGGERED

ECLIPSED

3- Bromo-4-chloro hexare

Br

you could use

C3-04 front back We also discuss several other topics like How can we find the marginal product of labor?

C4-63 front back

CH2CH3

(4- front -C1 - H Don't forget about the age old question of What is normal behavior?

C3 back! - Br -H

- CH2 CH3

- CH2 CH3

Br

CH2 CH3

CHEAT SHEET

OVOU

Relationships to

track

ANTI

GAUCHE

* more stable

* bring stenic strain

* do not count

hydrogens

2122

5-fluoro

heptane

2-3 ethyl A methy!

CHCH3 CH3

43

23 methyl u

ethys 5 fluoro heptane

4ethyl 5fluoro 2,3 dimethyl heptane

CHICH3 CH3

smethue non-3-01 4- butye 4-butyl 8 methyl non3-01

OH

B

Br

UOMO

one chair conformer will be more

favorable

Canti) trans

groups

one up

one down 1111 and 4

lower energy

energy stability - Hydrogens can bump - eauitorial positions

into other things give lower energy

Cislsyn

equal energy

StuOU

lower energy

1-3

diaxial interaction

Stereochemistry mirror images cannot be superimposedloverlayed

Fenantiomers t

all enantiomers have the exact same properties

V SOU

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