Question

The_ - is used for synthesis of Coumarin.​

Answer 1

Answer:

The Pechmann method has been used for the synthesis of coumarin derivatives in the presence of FeCl. 6H2O [101]. The feasibility of iron salt catalysts were observed in condensation reaction of resorcinol and methyl acetoacetate.

Explanation:

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Answer 2

Answer:

An efficient annulation of phenolic acetates with acrylates in the presence of [Rh2(OAc)4] as catalyst and formic acid as reducing agent provides high yield of coumarin derivatives via C-H bond activation. The addition of NaOAc as a base increased the yield of the products.