Question 33 Which of the following insecticides is formed by Diels Alder reactio

Question

Question 33

Which of the following insecticides is formed by Diels Alder reaction of hexachlorocyclopentadiene and how do you know that Briefly explain why there is such a vast number of insecticides ... 20 words can easily be enough. Pyrethrin insecticides are said to be "natural" type insecticides. Why? What structural feature is found in synthetic pyrethroids, like permethrin ..? What is the class of pesticides that is causing some much trouble for bees? How did Cousteau and friends probably get exposed to PCBs? How did Gavin get exposed, probably, to PBDEs? How do Orcas get exposed to PCBs ad PBDEs? Draw an example of a PCB congener and an example of a PBDE congener.

Explanation / Answer

Ans 31.

The first compound is formed as the result of diels alder reaction of hexachlorocyclopentadiene.

The reaction involves the halogen containing alkenes that have atleast one hydrogen atom which is bonded to double bonded carbon atom .

The reaction of hexachlorocyclopentadiene with thiones yields [2+4] cyclo adducts , as the one shown in compound 1 .

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