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Propane to propan1-ol reaction help

14839576657781770128893.jpg for q 2 , my reactions are not stated in the Mark scheme, is it still valid ?
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thanks
1483957718296-738677661.jpg247.3KB
Reply 1
Avatar for Pigster
Pigster
20
Knowledge of your spec is important, but I'll bet the answer is:

propane + chlorine + uv _>

then chloropropane + NaOH + ethanol ->

Anyhoo... your step 1 was wrong, for a number of reasons.
Reply 2
Avatar for alow
alow
19
Original post by coconut64
14839576657781770128893.jpg for q 2 , my reactions are not stated in the Mark scheme, is it still valid ?
Attachment not found
thanks


How exactly do you dehydrate propane?

And you second step would need a reaction which has Anti-Markovnikov selectivity, if not you form mostly propan-2-ol. Something like hydroboration.

Try a different route.
(edited 7 years ago)
Reply 3
Avatar for Pigster
Pigster
20
Original post by alow
...you form mostly propan-2-ol.


Strictly, the Q in the OP only asks for propanol and doesn't specify which one.

But you were correct, the OP shows -1- being formed, which virtually wouldn't.
Reply 4
Avatar for coconut64
coconut64
OP
16
Original post by alow
How exactly do you dehydrate propane?

And you second step would need a reaction which has Anti-Markovnikov selectivity, if not you form mostly propan-2-ol. Something like hydroboration.

Try a different route.


Can't you use concentrated H3PO4 to dehydrate the alkane to form an alkene though? Why does that not work?Cheers
Reply 5
Avatar for alow
alow
19
Original post by coconut64
Can't you use concentrated H3PO4 to dehydrate the alkane to form an alkene though? Why does that not work?Cheers


What's produced in a dehydration reaction?
Reply 6
Avatar for coconut64
coconut64
OP
16
Original post by alow
What's produced in a dehydration reaction?


Sorry yeah, dehydration wouldn't work as the water molecule is removed isn't it
Reply 7
Avatar for Pigster
Pigster
20
Original post by coconut64
Can't you use concentrated H3PO4 to dehydrate the alkane to form an alkene though? Why does that not work?Cheers


Dehydration is the removal of water from something. There is no oxygen in propane to make water.

You can dehydrate an alcohol to an alkene (but since you're trying to make an alcohol, that isn't smart).

You can dehydrogenate an alkane to make an alkene, but I'm not sure if it is on any A level spec.
Reply 8
Avatar for coconut64
coconut64
OP
16
Original post by Pigster
Dehydration is the removal of water from something. There is no oxygen in propane to make water.

You can dehydrate an alcohol to an alkene (but since you're trying to make an alcohol, that isn't smart).

You can dehydrogenate an alkane to make an alkene, but I'm not sure if it is on any A level spec.


Thanks

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