Upon treatment with a catalytic amount of BF3·OEt2, the reactionbetween azulene derivatives and epoxides efficiently affords azulenylethanolderivative
This first sentence explicitly informs the reader of the outcomes of the researchers' experiments and what compounds were used to synthesize their end product. This tells us that specific Lewis-Acid catalysts allow efficient formation of azulenylethanol products from the reaction between azulene and epoxides.

