Regioselective synthesis of 5-(arylsulfanyl)- and 5-(benzylsulfanyl)-6- phenylsalicylates by one-pot cyclizations of 1,3-bis(silyloxy)buta-1,3-dienes with 2-(arylsulfanyl)- and 5-(benzylsulfanyl)-3-ethoxy-1-phenylprop-2-en-1-ones
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