moodle.latech.edu CHEM-252-002-Spring18: Chem 251 Revievw Review of Chem 250 Che
ID: 1032270 • Letter: M
Question
moodle.latech.edu CHEM-252-002-Spring18: Chem 251 Revievw Review of Chem 250 Chem 251 Review Which statement is FALSE? 0 Select one: n O A. In a Diels-Alder reaction, the stereochemistry of the dienophile is retained in the final product. OB. In a Diels-Alder reaction, the reaction mechanism is concerted ° C. In a Diels-Alder reaction, the reaction forms 2 sigma bonds and 1 pi bond in a six-membered ring. O D. In a Diels-Alder reaction, the diene must be in the S-cis conformation. 0 E. In a Diels-Alder reaction, the reaction mechanism is step-wise. Next pa geExplanation / Answer
In the Diels-Alder reaction, a conjugated diene reacts with a dienophile ( a compound containing a carbon-carbon double bond). It is a concerted reaction becuase the addition occurs in a single step. In this reaction the product is a six membered ring in which a double bond is present because diene and dienophile combined to form two sigma bonds and one pi bond. Since the reaction is concerted, the configuration of the reactants is maintained. This reaction must involve suprafacial bond formation that is diene must be in S-cis conformation.
Therefore,
E. In a Diels-Alder reaction, the reaction mechanism is step-wise: False.
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