Département de chimie moléculaire

The first cobalt-catalysed cycloisomerisation of alkynoic acids is reported{,} thanks to the design of a well-defined diradical cobalt(iii) catalyst{,} in the absence of any additives. The high efficiency{,} regioselectivity and chemoselectivity are comparable to those of noble metal-based systems. The unique reactivity might be attributed to second coordination sphere effects.