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2 steps BU4NF C9H1602 A + B ÓSIME,tBu (i) Enone C can be prepared from alkyne A and aldehyde B in two steps via a gold-catalysed reaction. Identify A and B and provide reagents/conditions for a synthesis of C. (ii) Give the structure of D and classify the ring-closing reaction for its formation from C according to Baldwin's rules

2 steps BU4NF C9H1602 A + B ÓSIME,tBu (i) Enone C can be prepared from alkyne A and aldehyde B in two steps via a gold-catalysed reaction. Identify A and B and provide reagents/conditions for a synthesis of C. (ii) Give the structure of D and classify the ring-closing reaction for its formation from C according to Baldwin's rules

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Answer ALL parts. (a) Treatment of enone C with tetrabutylammonium fluoride leads to the formation of heterocycle D. 2 steps BU4NF C9H1602 A + B D OSIME,tBu (i) Enone C can be prepared from alkyne A and aldehyde B in two steps via a gold-catalysed reaction. Identify A and B and provide reagents/conditions for a synthesis of C. (ii) Give the structure of D and classify the ring-closing reaction for its formation from C according to Baldwin's rules (iii) Sketch the key molecular orbitals involved in the ring-closing reaction in part (ii) and hence explain whether the reaction is favourable or unfavourable.
Transcribed Image Text:Answer ALL parts. (a) Treatment of enone C with tetrabutylammonium fluoride leads to the formation of heterocycle D. 2 steps BU4NF C9H1602 A + B D OSIME,tBu (i) Enone C can be prepared from alkyne A and aldehyde B in two steps via a gold-catalysed reaction. Identify A and B and provide reagents/conditions for a synthesis of C. (ii) Give the structure of D and classify the ring-closing reaction for its formation from C according to Baldwin's rules (iii) Sketch the key molecular orbitals involved in the ring-closing reaction in part (ii) and hence explain whether the reaction is favourable or unfavourable.
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