What product do you NOT expect from this reaction H,C=CH-CH=CH2 Br. H:C = CH-CH-

Question

What product do you NOT expect from this reaction H,C=CH-CH=CH2 Br. H:C = CH-CH-CH- NH-C-CH=CH-CH: T Br Br Br Br -CHD All of these are formed Br Br A) A B)BCC D) D why is 1,3-cyclopentadiene not sold by ANY chemical suppliers? A) it cannot be B) it is too expensive itisatswitmaveenuo.ktotr.. AAg(-Bc 2 oredl it is a gas, and gases are too to transport Which would be the most reactive dienophile? 2. 42. Which of the following would react fastest with 1,3-cyclopentadiene? H.C=CH-CH2-CH,-CHO A) A B)B OCD D

Explanation / Answer

Of course you are right (your predictions are correct.

39. Option C, since bromination of diene occurs either 1,2- or 1,4-addition. Both options A&B are examples for 1,2& 1,4-addition. While option C is neither 1,2 nor 1,4. Hence option C is not possible.

40. Option C, since it exists as dimer form.

41. Option C, since Dienophile is the one which should be more electrophilic (electron deficient and acts as LUMO)

42. Option C, same reason as in Question 41. In option C, double bond is in conjugation with ketone and involves delocslisation hence more electron deficient alkene. So, readily participates in Diels - Alder reaction with cyclopentadiene.

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