gauche- not eclipsing

=3.8

the longer the chain what effect does it have on BP

- greater number of substtudents

hight bp= longer the chain

more substitudents= lower bo

1. prioritize based on mass

2. if atoms are similar on 2 similar chains keep moving down the chain untill you reach one that is different--> whichever one has higher wait wins in priority

mirror images

all wedges are dotted

all dotted are wedges in mirror

similar except not all chiral center substuents have complely converted to wedges--> dotted vice versa

twins with different moles

2^n

where n= number of chiral centers

how do you know for sure that number of possible steroisomers is right?

cannot by symetrical  at the plane of symmetry

represents 2 of carbons connected to atom

double bond greater then single carbon bond

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**Switch #4 with whatever group is on the dash answer is opposite from what is seen!!

1.   If lowest is already on dash then direction = answer

1.ind the stereocenter first and then label the groups attached to it in order of their priority.

2. lowest priority to back (flip dashed )

3. R vs. S

4. two compounds  are are mirror images of each other, but** the configuration at the stereocenter differs (R vs S) differs, they are not superposable

difference between amine and phosphorous centers?

why is amine S while P is R?

P does not go through INterconversion because Amine has ability to tunnel electrons through other side causing a shifting of atom substituents.

(look in class notes)

use sterocenter configuration rules ( R vs S