Excited (triplet) states offer a myriad of attractive synthetic pathways, including
cycloadditions, selective homolytic bond cleavages and strain-release chemistry …

Benefiting from the impressive increase in fundamental knowledge, the last 20 years have
shown a continuous burst of new ideas and consequently a plethora of new catalytic …

For more than one century, photochemical [2+ 2]-cycloadditions have been used by
synthetic chemists to make cyclobutanes, four-membered carbon-based rings. In this …

For molecules with a singlet ground state, the population of triplet states is mainly possible
(a) by direct excitation and subsequent intersystem crossing or (b) by energy transfer from …

Naturally evolved enzymes, despite their astonishingly large variety and functional diversity,
operate predominantly through thermochemical activation. Integrating prominent …

We report the use of photocatalysis for the homolytic ring-opening of carbonyl
cyclopropanes. In contrast to previous studies, our approach does not require a metal …

Energy transfer can leverage the enormous potential of excited-state reactivity. Through"
indirect excitation" of substrates, otherwise elusive reactivity modes can be switched on …

The ability to program new modes of catalysis into proteins would allow the development of
enzyme families with functions beyond those found in nature. To this end, genetic code …

As the breadth of radical chemistry grows, new means to promote and regulate single-
electron redox activities play increasingly important roles in driving modern synthetic …

Photocycloaddition is a powerful reaction to enable the conversion of alkenes into high-
value synthetic materials that are normally difficult to obtain under thermal conditions …