Substituent effects on the cyclization mode of 7-sulfonyl-3-hepten-1,5- diynes and 11-sulfonylundeca-3,7-dien-1,5,9-triynes
In probing of cycloaromatization of 7-phenylsulfonyl-3-hepten-1,5-diyne systems to generate biradical intermediates under an alkaline condition suggested that the aryl moiety on C3-C4 also plays an important role to switch the Myers cyclization to Schmitt