Synthesis of functionalized 6-(Pyridyl)salicylates, Bis(benzophenones), chlorinated 6H-Benzo[c]chromen-6-ones, 9H-Fluoren-9-ones, Isobenzomorphans and Dibenzo[b,d]pyrid-6-ones based on new cyclocondensations of 1,3-Bis(silyloxy-1,3-butadienes
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