Consider the structure of nitrosobenzene: (a) Draw the resonance structures of the sigma complex formed when nitrosobenzene

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Consider the structure of nitrosobenzene:

N.


(a) Draw the resonance structures of the sigma complex formed when nitrosobenzene reacts with an electrophile (E+) at the ortho position.

(b) Draw the resonance structures of the sigma complex formed when nitrosobenzene reacts with an electrophile (E+) at the meta position.

(c) Draw the resonance structures of the sigma complex formed when nitrosobenzene reacts with an electrophile (E+) at the para position.

(d) Compare the stability of the intermediates from parts a€“c of this problem, and then predict whether the nitroso group is ortho-para directing or meta directing.

(e) The nitroso group has a lone pair adjacent to the ring (suggesting that it could be an activator), yet it also has a π bond to a heteroatom in conjugation with the ring (suggesting that it could be a deactivator). Experiments reveal that this group is a deactivator. Based on this information, identify which of the following groups is expected to have properties most similar to the nitroso group, and explain your choice:

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Organic Chemistry

ISBN: 978-0470917800

1st edition

Authors: David R. Klein

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