Rhodium- and chromium-catalyzed addition reactions of various (T-bonds. such as C-H. N-H, O-H, Si-H, and S-H bonds, to (2-furyl)carbenoids in situ generated from conjugated carbortyl-ene-yne compounds having electron-withdrawing groups on an alkyne terminus are described. 2-Alkoxy-2.5-dihydrofuran was obtained from the chromium-catalyzed addition reaction of an alcohol with the (2-furyl)carbene chromium intermediates in a conjugate manner.