Identify (X) and (Y) in the following transformation :
This question is built on drawn structures, so the options cannot be reproduced as text. The chemistry behind the official answer is outlined below.
The sequence is organotin chemistry on a dibutylstannylene fragment. LDA is a strong, bulky, non-nucleophilic amide base: its role is to deprotonate rather than to add, generating a carbanionic centre alpha to tin in intermediate (X).
The second step uses CH2Cl2 with MeLi. MeLi deprotonates dichloromethane to give the chloromethyllithium carbenoid LiCHCl2/ClCH2Li, a classic one-carbon homologating reagent. Reaction of a carbenoid with the organotin intermediate inserts a CH2 unit, so (Y) is the ring-expanded or homologated stannacycle rather than a free stannylene.
The key discrimination among the options is that a genuine tin-carbon double bond, written Sn=CH2, is not the product here: stannenes of that type are extremely reactive and are not isolated under these simple conditions, so options depicting Sn=CH2 for both X and Y do not describe the real transformation.
Per the official final answer key the answer is option (A).
Similar Questions
The species that contain a vacant d x2 - y2 orbital is :
The solutions of
(i) [Cr(OH2)6]3+ ions are pale blue-green, but the chromite ion
(ii) [CrO4]2- is an intense yellow due to :
The major product of the following reaction in :
FeCl2 . 4H2O and FeCl3 . 6H2O can be distinguished by 57Fe Mössbauer spectroscopy. The INCORRECT statement from the following is :
The oxyacids of sulphur having direct S-S bonds are :
The point group of Cis - [PtCl2(NH3)2] is :
Covalent multinuclear bonds are found in the solid state structures of :
The structures of tetrasulphur tetranitride (a) and tetrathiazyl tetrafluoride (b) are given below. The statement that correctly describes the structures is :
Between NF3 and NH3 :
In an axially symmetric field, the first NQR transition energy for I = $\frac{3}{2}$ is :
Important Questions from Structure of Atom
- According to Bohr's model, electromagnetic radiations possess dual character properties behaving like:
- Which of the following is NOT an isotope of hydrogen atom?
- The atomic number of an element is equal to which of the following?
- Which of the following factors primarily determines the size of an atom?
- The atomic radius of hydrogen atom is
