Electrocyclics

[chiddler]

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Question about our favorite ochem subejct: electrocyclic reactions! Whoah, calm down! I know how fun these reactions are, too!

I don't understand this question:

For reference.

Thank you very much!

 

[SaintJude]

The answer is B. An allylic atom is one bonded to a carbon atom that in turn is doubly bonded to another carbon atom. "Vinylic" is used to described the atoms directly associated with the C=C unit. In your picture, the vinylic carbon has an R1 substituent. If your replace the R1 with a H, then you see an aldehyde forming.

I think this link below is great in solidifying the difference betwen allylic and vinylic atoms:
http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch10/ch10-2.html

 

[chiddler]

The answer is B. An allylic atom is one bonded to a carbon atom that in turn is doubly bonded to another carbon atom. "Vinylic" is used to described the atoms directly associated with the C=C unit. In your picture, the vinylic carbon has an R1 substituent. If your replace the R1 with a H, then you see an aldehyde forming.

I think this link below is great in solidifying the difference betwen allylic and vinylic atoms:
http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch10/ch10-2.html

oh! it seems very simple after reading your description!

thanks very much.