2009-4-29 18:45
sillygirl
CHEM --- KMnO4/ H+ 可以同alkanol react的嗎?
我想問KMnO4/ H+ 可以同alkanol react的嗎?
有一條question問點分propene &propanol ?
ans: propene decolories KMnO4/H+ while propan-2-ol does not
要under reflux有reaction?
但notes又話ethanol可以同cold KMnO4/H+ 出acid
2009-4-29 20:50
magiyafeimo
我想問KMnO4/ H+ 可以同alkanol react的嗎?
可以
呢個係oxidation
KMnO4 oxidize alkanol
有一條question問點分propene &propanol ?
ans: propene decolories KMnO4/H+ while propan-2-ol does not
要under reflux有reaction?
propan-2-ol冇咁reactive
因為個OH既位置係中間，個alkyl group既3個Carbon可以分擔d polarity令佢冇咁polar
所以就唔易去react要有熱或催化物
仲有，bromine test都得，propene令bromine無色而propan-2-ol唔得
另外，係室溫下propene係氣體propan-2-ol係液體
但notes又話ethanol可以同cold KMnO4/H+ 出acid
要睇係唔係isomer
2009-4-29 21:03
sillygirl
thanks a lot!
2009-5-1 13:25
ZeroYip
propene = prop-1-ene right?
2009-5-1 13:27
ZeroYip
回復 #2 magiyafeimo 的帖子
umum
just back from exam weekXD
i just know a little bit about O-Chem right now
but i feel sth seems not correct =.=
no idea what are they....
i can tell more next semiXD
2009-5-1 17:47
magiyafeimo
呢度有幾樣野要留意
首先係
propanol係primary alcohol
propan-2-ol係secondary alcohol
佢既polarity係會有唔同
其次係propene同propan-2-ol係室溫下形態唔同
一分就分到
冇必要做test去分
所以我覺得呢個題出得有d怪
2009-5-2 15:29
ZeroYip
係lo
依家d問題愈來愈好玩xd
ps magiyafeimo 你依家讀緊咩?
2009-5-2 16:33
magiyafeimo
本韃現在就讀中大地球物理碩士課程
大學本科就係讀應用物理
2009-5-3 11:53
ZeroYip
道不同不相為謀
小弟是chem(bio?) major
日後要讀phy-chem
要打擾你了xd