@article {49695, title = {Dopant and exfoliation induced simultaneous modification of charge density and C--C coupling sites for efficient CO2 photoreduction to ethylene}, journal = {Angewandte Chemie-International Edition}, volume = {64}, year = {2025}, month = {JUL}, pages = {e202423471}, type = {Article}, abstract = {

The photochemical conversion of CO2 into C2+ products has emerged as an attractive method for synthesizing valuable chemicals and fuels using abundant solar energy. However, the challenge lies in enhancing the efficiency and selectivity of C2+ product formation. In this study, we employed a heteroatom doping strategy to optimize the photocatalytic parameters and achieve excellent efficiency and selectivity in the photocatalytic CO2 reduction to C2+ product formation. Our experimental analysis revealed that the local electronic structure of the catalyst, modified by In-doping, enables enhanced efficiency. Additionally, the incorporation of Cu facilitates the coupling of C1 intermediates, resulting in excellent selectivity towards C2+ products. The CO2 reduction performance is further enhanced through exfoliation, which increases the exposure of active sites and extends the charge carrier lifetime by reducing the charge diffusion length. We report that the rate of formation of C2H4 reached 54.3 mu molh(-1)g(-1) with an outstanding selectivity of 91\% over the exfoliated CuIn-doped AgBiP2S6 catalyst. By elucidating the role of heteroatom doping and exfoliation in enhancing both the efficiency and selectivity of C2+ product formation, our study contributes to advancing the development of sustainable and efficient photocatalytic CO2 conversion technologies.

}, keywords = {C \& horbar, C coupling, CO2 reduction, Doping, Exfoliation, Photocatalysis}, doi = {10.1002/anie.202423471}, author = {Das, Kousik and Chakraborty, Subhajit and Kediya, Siddhi and Singh, Ashutosh Kumar and Das, Risov and Mondal, Soumi and Riyaz, Mohd and Goud, Devender and Dutta, Nilutpal and Vinod, Chathakudath P. and Peter, Sebastian C.} } @article {49562, title = {Iron mediated oxidative ring opening-homocoupling of cyclopropanols: facile access to 1,6-diketones}, journal = {ChemistrySelect}, volume = {10}, year = {2025}, month = {MAY}, pages = {e202501745}, type = {Article}, abstract = {

We have developed a new approach for the synthesis of 1,6-diketones via iron-catalyzed ring opening of cyclopropanol with a nontoxic, inexpensive iron catalyst under open-air conditions. This method eliminates the need for additives and employs tert-butanol as an eco-friendly solvent. This methodology allows rapid access to a variety of symmetrical 1,6-diketones under mild conditions. Preliminary mechanistic studies revealed the involvement of radical pathways.

}, keywords = {1, 6-Diketone synthesis, C \& horbar, C bond cleavage, cyclopropanols, Homocoupling, Iron mediated}, issn = {2365-6549}, doi = {10.1002/slct.202501745}, author = {Shinde, Ravi A. and Shirsath, Sachin and Muthukrishnan, M.} } @article {49677, title = {Nickel-catalyzed regioselective C--H alkynylation of pyridones and isoquinolinones using alkynyl bromides}, journal = {ChemCatChem}, volume = {17}, year = {2025}, month = {JUN}, type = {Article}, abstract = {

A straightforward and efficient protocol for the regioselective C \& horbar;H alkynylation of 2-pyridones and isoquinolinones with bromoalkynes under nickel catalysis is described. The alkynylation reaction is enabled by a simple and inexpensive Ni(OTf)2/tBubpy catalyst system and uses easily accessible bromoalkynes. The protocol demonstrates a broad substrate scope with up to 95\% yield (42 examples) and accommodates synthetically valuable functionalities, such as halides, trifluoromethyl, nitrile, ether, thioether, alkyl silanes, and alkene, as well as heteroarene moieties like pyridinyl, furanyl, and thiophenyl. The pyridinyl directing group on alkynylated 2-pyridones can be smoothly removed to give C6-alkynylated free NH-pyridone. Preliminary mechanistic studies suggest that the alkynylation proceeds via a 2e- oxidative addition pathway involving crucial C \& horbar;H activation.

}, keywords = {alkynylation, C \& horbar, H Activation, Mechanism, Nickel, pyridones}, issn = {1867-3880}, doi = {10.1002/cctc.202500338}, author = {Verma, Suryadev K. and Patil, Harshal R. and Punji, Benudhar} }