The major product formed in the following reaction is
An allyl vinyl ether undergoes the Claisen rearrangement on heating: a concerted [3,3]-sigmatropic shift through a chair-like six-membered transition state that breaks the allylic C–O bond and forms a new C–C bond, giving a γ,δ-unsaturated carbonyl compound.
Here the vinyl ether oxygen is attached to an allylic ring carbon whose neighbouring ring double bond runs to the ring-fusion carbon. Numbering O as atom 3, the vinyl terminus (atom 1) bonds to the far end of the allyl unit, which is the ring-fusion carbon. The ring double bond shifts one position, and the vinyl group becomes a CH2CHO chain. The product is the angular aldehyde, an octahydronaphthalene bearing CH2CHO at the ring junction with the double bond moved into the ring.
A simple isomeric enol ether merely migrates the double bond and is not a rearrangement product at 195 °C. An angular vinyl ether would need the C–O bond to move, which does not happen in a [3,3] shift. A bridged bicyclic ketone would require a different, intramolecular cyclisation not supported by these conditions.
the angular aldehyde with a CH2CHO group at the ring-fusion carbon option is correct.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
