An economic and environmental synthestic method for 3-chloroindenes from o-(alkynyl)styrenes through tandem reactions including choropalladation/Heck cross coupling in Pd/O 2 system was reported. Taking green dioxygen as sole oxidant and LiCl as chlorine source, 13 functionalized 3-chloroindenes could be synthesized in moderate to high yield without the addition of CuCl 2
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