Multiple Diels-Alder reaction of bis (silyloxy) cross-conjugated trienes is presented. Two trienes, 3-benzylidene-and 3-(methoxymethylene)-2, 4-bis (trimethylsilyloxy)-1, 4- pentadiene, undergo two sequential Diels-Alder cycloadditions with a variety of dienophiles forming hydronaphthalene rings. Some characteristics of this reaction have been discussed in terms of stereo-, regio-, and chemoselectivity. It is proposed that this process is referred ...