Which of following conditions must be met for a Claisen condensation to proceed
ID: 531123 • Letter: W
Question
Which of following conditions must be met for a Claisen condensation to proceed with a reasonably yield? The starting ester cannot have any alpha protons The starting ester should have at least 1 alpha proton The starting ester should have at least 2 alpha protons The starting ester should have at least 3 alpha protons Which of the following compounds is most reactive in hydration reaction? Which of the following compounds is NOT an organometallic compound? N-BuLi; PhCH_2K; C.CH_3OMgBr; CH_2 = CHNa Which of the following combinations is the ideal one for a mixed Claisen condensation? Which of the following hydrocarbons can be synthesized efficiently using lithium dialkylcuprate? Which of the following reactions is the most unlikely one?Explanation / Answer
8. B, In Claisen condensation, ester should have atleast one alpha hydrogen to generate carbanion intermediate.
9. D, Hydration of carbonyl compounds is an example for Nucleophilic Addition Reaction and trifluoro acetaldeyde is more reactive.
10. C, since there is no direct bond b/n carbon and metal, C-M is compulsory condition for organometallic bond.
11. A, Since both are different esters and have alpha hydrogen.
12. A, it is an example for Corey -House synthesis of alkanes, specially for odd carbon alkanes which are not possible from Wurtz reaction.
13. C, since all starting materials are acid derivatives and reaction type is Nucleophilic Substitution. Amides are least reactive towards Nucleophiles among all the others
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