Reference of 4687-25-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.4687-25-6, Name is Benzofuran-3-carbaldehyde, molecular formula is C9H6O2. In a Article，once mentioned of 4687-25-6
alpha-Diazo ketones derived from furanyl- and benzofuranylpropionic acids were prepared, and their rhodium(II) acetate catalyzed behavior was studied.The results are consistent with a mechanism in which the key step involves addition of a keto carbenoid intermediate on to the furanyl ?-bond followed by an electrocyclic ring-opening reaction.In the case of the benzo-substituted furanyl system, the suspected bicyclic intermediate was isolated in high yield and its chemistry was subsequently investigated.The bicyclic ketone derived from 1-diazo-4-(2-benzofuryl)-2-butanone undergoes a novel thermal rearrangement to a benzopyranone derivative.This unexpected transformation can be rationalized in terms of a <4 + 2>-cycloreversion reaction to give an ortho-quinoidal intermediate, which undergoes a subsequent electrocyclic ring closure followed by a 1,3-hydrogen shift.Furans with side chains of various lengths containing a diazomethyl keto group were also studied.The cyclization chemistry of the closely related diazothienylalkanone system was investigated and found to give products derived from an analogous intramolecular cyclopropanation reaction.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H1198O – PubChem