When pseudoionone is treated with BF3 in acetic acid, ring closure takes place and Icirc plusmn and Icirc sup2 ionone are produced This is the next step in the vitamin A synthesis (a) Write mechanisms that explain the formation of Icirc plusmn and Icirc sup2 ionone (b) Icirc sup2 Ionone is the major product How can you explain this (c) Which ionone would you expect to absorb at longer wavelengths in the UV visible region Why BF HOAC a lonone Ionone Pseudoionone

Question: When pseudoionone is treated with BF3 in acetic acid, ring closure takes place and Î±-and Î²-ionone are produced. This is the next step in the

When pseudoionone is treated with BF3 in acetic acid, ring closure takes place and Î±-and Î²-ionone are produced. This is the next step in the vitamin A synthesis.

(a) Write mechanisms that explain the formation of Î±-and Î²-ionone.
(b) Î²-Ionone is the major product. How can you explain this?
(c) Which ionone would you expect to absorb at longer wavelengths in the UV-visible region? Why?

BF HOAC a-lonone -Ionone Pseudoionone

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