33hehe.... aage banate to E nahi aata...
:P
36 Answers
1mayb priyam in ur ans the double bond I hav shown wud be shifted 2 terminal postn
33its different.. anvi...
yaha α hydrogen nahi hai ketone me.. par question wale me hai..
1hai mere dost zara achhe se dekho!
α-Carbon pe sirf 3 sub. hai matlab ek α-H hai (toking of the internet img I've uploaded)
33
...and -OTs is very good leaving group..and ketone have acidic H.(Hint for C)
33Opsie.. merea matlab.. steric hindrance bhi to hai.. [3][3]
And do do double bond hai.... and see B its comletely different with -OTs... it changes its reaction completely... :)
1Actually learnt this diene + keton reactn frm net itself!!!
the fol. is jus an eg. apply the same 2 our questn.
3hey priyam, two questions:
one, with the ketone as reagent in step B to C, is acidic condition given ??
we will need that to abstract alpha H so that the ketone can act as nucleophile and displace OTs from the ester rite ??
second, does the mech from D to E involve addtion compund betn. O of epoxide and AlCl3, resulting in formation of O - C bond cleavage, 2° carbocation, which then attacks the O of ketone to form a ring ???
plzz reply soon ne !!
33@Nihit...
yeah acidic one so that enolisation is more...
and when u reach D then see of mechanics...(give picture instead for clarity..)But u are almost right there also..)..
1vahi jo aage internet vali funny si img. paste ki na usme they had shifted so mene bhi kar diya.....
ha par mujhe bhi logical nahi laga tha u r crrct vo dubl bond shift nahi hoga PRIYAM
33extra carbon... :O
just remove one carbon...
and it will be right.. :)
33Ashish ur A is right..
TsCl.. do you know its structure... then it will be helpful
