organic achiever test 3

[pistolpete007]

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77. why is -CF3 deactivator isnt this an "R" group i understand this has 3flourine on it but do u look at that since the first thing attached the the ring is a C.....like i can see why if u have flourobenzene that deactivating but...but if u have a CF3-where carbon is attached to the benze wouldnt that make the whole CF3 an R group?

79
if u have 2butanone

i understand that C1 is singlet
i understand that C4 is triplet
but for C3 how do u know not to look to the left and make it a singlet instead of looking to the right and making it a quartet?

 

[mddang]

77. why is -CF3 deactivator isnt this an "R" group i understand this has 3flourine on it but do u look at that since the first thing attached the the ring is a C.....like i can see why if u have flourobenzene that deactivating but...but if u have a CF3-where carbon is attached to the benze wouldnt that make the whole CF3 an R group?

The F atoms are very electron withdrawing, so the C attached to the benzene ring is very partially positive. This carbon pulls electron density away from the benzene ring and destabilizes the intermediate (C+) formed during the electrophilic aromatic substitution reactions.

79
if u have 2butanone

i understand that C1 is singlet
i understand that C4 is triplet
but for C3 how do u know not to look to the left and make it a singlet instead of looking to the right and making it a quartet?

You only look at the carbons adjacent to the carbon atom in question.

C3 ( -CH2- ) is adjacent to C2 (the carbonyl carbon) and to C4(-CH3).

The carbonyl carbon has no hydrogens, so only the H on C4 will affect the signal splitting for the H on C3.

 

[pistolpete007]

so if u had an aldehyde like CH3CH2Ch2CH2COH

C1 is triplet
C2 is quaurtet u dont count the H on C3 bc it is equivalent
C4 u have a quartet
C5 u have a triplet is that correct?

im starting with the carbonyl c by the way