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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Jun 2008 14:42:22 IST
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LiAlH4 or NaBH4 ????????
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3 Jun 2008 14:49:28 IST
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LiAlH4
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3 Jun 2008 14:50:29 IST
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Why?????????
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3 Jun 2008 14:57:51 IST
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Q. LiAlH4 and NaBH4 both reduce carboxylic acids / ketones, but only LiAlH4 reduces a nitro group? Why doesn't NaBH4 reduce the Nitro group?
Ans.the first one is probably about the improved reactivity of lithium over sodium. Lithium loves oxygen more than sodium does; this is because nitro groups can be reduced with lithium aluminum hydride; you know that slightly basic sodium borohydride in alcohol or water is used for reduction; lithium aluminium hydride is not. That may be why the different reactivities are.
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3 Jun 2008 15:06:54 IST
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but lialh4 is expensive
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3 Jun 2008 15:11:24 IST
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Yeah, LiAlH4 is expensive, but it dosen't stop it from being a better reducing agent!!!!!!!!!!!!
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Please rate this Q/A.
ASTANAVISTA BABE, |
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3 Jun 2008 15:38:54 IST
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LiAlH4
DUE to presence if Li it can easily lose its 4 hydrogen
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believe enthusiams and confidence coupled with concentration & hard work can do wonders. |
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3 Jun 2008 15:42:30 IST
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LiAlH4 ------> 4H
NaBH4 ------> NaBH3 + H
so since LiAlH4 gives 3 more hydride ions than NaBH4 hence it is a far more better reducing agent
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"Imagination is more important than knowledge."
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3 Jun 2008 16:01:40 IST
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LiAlH4 is better than NaBH4 as u can reduce carboxylic group with LiAlH4 but not with NaBH4
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You gotta do wat u gotta do |
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4 Jun 2008 10:33:56 IST
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LiAlH4 ismore reactive than NaBH4.
But at the same time handing of NaBH4 is easy.so if in any case we are able to use both we select NaBH4.
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B.Tech IIT ROORKEE
faculty (chemistry) Career Launcher Ind Ltd.
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6 Jun 2008 10:12:03 IST
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actually NaBH4 is better since is a very selective reducing agent , reduces perticular functions in the compound
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6 Jun 2008 10:20:09 IST
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LiAlH4 is a better reducing agent than NaBH4. this is because the al atom has larger size as compared to boron hence the tendenceny to form a hydride(strong) is more in LiAlH4. as such the hydride produced by LiAlH4 is better reducing agent.
rate me if satisfied!!!!!!!!!
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6 Jun 2008 10:56:33 IST
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LiAlH4 is greater reducing agent. 4 xample LiAlH4 can reduce acid to alcohol where as another one can reduce acid to aldehyde...
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Great spirits have always encountered violent opposition from mediocre minds -- Albert Einstein |
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6 Jun 2008 20:07:18 IST
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it wud b surely b LiAlH4 b coz Li can easily lose d hydrogens if u refer d organic chemistry of ARIHANT den u wud find d correct reason to it
rate surely if u find it useful
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its time fr u to achive d goal wake up donot hesitate to do hard work |
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