39
Pritish Chakraborty
·2010-02-24 11:13:08
1)Aldehyde A has no alpha hydrogen for sure if it doesn't undergo aldol...
but don't alkenes give ozonolysis?
3) mein I think Br will attach to the right most benzene ring para to the nitrogen...
4)Aldol and retro aldol reactions? just a guess.
13
Avik
·2010-02-24 11:20:24
1) Okay got ur point, yes noa lpha hydrogens... but do alkynes also give ozonolysis with cleavage ?
3) U're right.
4) Zyaada mat socho. (waise, when i saw the sol.n it was tomfoolery, not a very clear Qn though.)
39
Pritish Chakraborty
·2010-02-24 11:41:48
http://en.wikipedia.org/wiki/Ozonolysis#Ozonolysis_of_alkynes
I mean...how can aldehydes undergo ozonolysis??
B being oxidized by silver means it responds to Tollen's reagent.
C would be a dicarboxylic acid.
Also in 2), ester group has -I effect. Meta position nitration?
13
Avik
·2010-02-24 11:45:40
Where is the aldehyde undergoing ozonolysis...? The double/triple bonds will be there fr tht & the -CHO will be intact & will become a part of (B). [1]
13
Avik
·2010-02-24 11:47:27
1) Yeah, tht way (C) comes out 2b Oxalic Acid.
2) Kaun se -Phenyl mein, the one attached with -O or the one with -C=O ?
29
govind
·2010-02-24 22:24:49
Ans 2..Para position of the Phenyl group attached to -O..
13
Avik
·2010-02-24 23:33:35
1) Yeah avinav, i got the same. (Ans nahi hai mere paas iska)
2)Govind's rite, Are v considering the 2nd ring (-O waali) to be activated by the lp(s) of oxygen ??
29
govind
·2010-02-24 23:42:05
Ya..we have to consider the +R effect by the lone pair of Oxygen...
13
Avik
·2010-02-26 08:24:26
Ok see the solution given fr Q4)....
R-C(=O)-O-C(=O)-R' ---(Hot aq. Na2CO3)---> R-C(=O)-ONa (B) + R'-C(=O)-ONa (C).
(C) + H2SO4 ----> R-COOH + R'COOH. (Acids)
---(Distill.)----> R-C(=O)-O-C(=O)-R'.
Aisa toh sapney mein bhi nahi socha tha maine...[3]
(IIT MAy 1997 Qn!)