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Posted: **Mon Jul 11, 2022 1:25 pm**

: Crude Extracts From The Ginkgo Tree Ginkgo Biloba Have Been Used For Centuries To Alleviate Symptoms Associated With A 1 (18.88 KiB) Viewed 30 times

: Crude Extracts From The Ginkgo Tree Ginkgo Biloba Have Been Used For Centuries To Alleviate Symptoms Associated With A 2 (13.22 KiB) Viewed 30 times

Crude extracts from the ginkgo tree, Ginkgo biloba, have been used for centuries to alleviate symptoms associated with asthma. There are four principal components of Ginkgo extracts, called ginkgolide A, B, D, and M. During E. J. Corey's classic synthesis of ginkgolide B, compound 1 was converted into compound 5 U. Am. Chem. Soc. 1988, 110, 649-651): H₂CO 5 TIO 3b
Draw curved arrows that show a mechanism for the conversion of 1 to 3b. - + Edit Drawing