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para-Nitrobenzaldehyde vs. benzaldehyde

para-Nitrobenzaldehyde reacts at a faster rate than benzaldehyde in the Perkin reaction while p-N,N-dimethylaminobenzaldehyde is much less reactive toward the same nucleophile. Explain.

Subject:

Chemistry

Topic:

Organic Chemistry

Posting ID:

27023

OTA ID:

103897

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Perkin and related reactions

There are numerous condensations that are closely related to the Perkin reaction. Among these are the aldol /3Badv/, and /A3a/, Knoevenagel, Claisen, and Dickmann condensations. What general class of compounds can be prepared using each of these well-known reactions?

Subject:

Chemistry

Topic:

Organic Chemistry

Posting ID:

27024

OTA ID:

103997

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The Witting Reaction

Why is it important that any aldehyde used in Witting reaction be free of carboxylic acid impurities?

Subject:

Chemistry

Topic:

Organic Chemistry

Posting ID:

27025

OTA ID:

101042

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Predict the product

Predict the major organic product formed in the following reaction: CH3CH2NO2 + CH2O yields ? (Note: NaOH is shown above the "yields" arrow.)

Subject:

Chemistry

Topic:

Organic Chemistry

Posting ID:

27028

OTA ID:

103997

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Crossed aldol condensations

"Crossed" or "mixed" aldol condensations are practical for synthesis, if one of the aldehydes (or ketones) has no alpha-hydrogen atoms. Explain.

Subject:

Chemistry

Topic:

Organic Chemistry

Posting ID:

27029

OTA ID:

103997

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