01312nas a2200241 4500008004100000022001400041245008900055210006900144260000900213300001400222490000700236520051800243653000600761653002700767653001800794653002100812100002800833700001700861700002500878700002100903700002400924856012200948 2024 eng d a1359-734500aElectrochemically enabled (3+2) cycloaddition of unbiased alkenes and β-dicarbonyls0 aElectrochemically enabled 32 cycloaddition of unbiased alkenes a cMAY  a5836-58390 v603 a

A (3+2) cycloaddition between unbiased alkenes and 1,3-dicarbonyls is accomplished by judicious choice of electrode material and electrocatalyst to access dihydrofuran derivatives. A fluorinated porous carbon electrode with appropriate thickness governs unprecedented reactivity. This methodology eliminates the necessity for any stabilizing group within the alkene substrate. This is a rare example of the annulation of unbiased internal and terminal alkenes with cyclic and acyclic beta-dicarbonyls.

10a110a3-DICARBONYL COMPOUNDS10aDIHYDROFURANS10aFACILE SYNTHESIS1 aSuryawanshi, Sharad, M.1 aSahoo, Suman1 aShaligram, Parth, S.1 aManna, Narugopal1 aSamanta, Ramesh, C. uhttps://library.ncl.res.in/content/electrochemically-enabled-32-cycloaddition-unbiased-alkenes-and-%CE%B2-dicarbonyls02202nas a2200265 4500008004100000022001400041245011700055210006900172260000800241490000700249520127100256653001701527653003001544653002601574653002301600653002801623100002101651700001601672700003101688700002001719700001701739700002401756700002401780856013201804 2025 eng d a0947-653900aElectrochemical deconstruction of waste polyvinylidene chloride (PVDC) to value-added products in batch and flow0 aElectrochemical deconstruction of waste polyvinylidene chloride  cFEB0 v313 a

Chlorinated polymers have made enormous contributions to materials science and are commercially produced on a large scale. These chlorinated polymers could be recycled as chlorine sources to efficiently produce valuable chlorinated compounds owing to their facile release of HCl. Although the thermal stability of PVDC is low compared to PVC, this can be advantageous in terms of easy and fast dehydrochlorination. Herein, we report an efficient electrochemical chlorination using poly(vinylidene chloride) (PVDC) as a chlorine source that works in an undivided cell and applies to a good number of examples. This method works on commodity polymers such as waste PVDC-PVC pharma blister film, PVDC-PO multilayer food packaging, and compression molded sheets of Ixan PVDC (with heat stabilizer) with similar efficiency. Furthermore, this method also provides the dechlorination of PVDC up to 98 %, leading to unsaturated dechlorinated material. Converting PVDC into more stable unsaturated compounds, the release of harmful chlorine-containing gases during incineration can be minimized. Additionally, this method is not only restricted to batch processes but an electroflow process for PVDC dechlorination and electrosynthesis has also been demonstrated.

10achlorination10aElectrochemical recycling10aElectroflow-synthesis10aGraphitic material10aPolyvinylidene chloride1 aMishra, Subhadip1 aKar, Sourav1 aRangappa, Raghavendrakumar1 aPatil, Prashant1 aKadam, Vijay1 aChikkali, Samir, H.1 aSamanta, Ramesh, C. uhttps://library.ncl.res.in/content/electrochemical-deconstruction-waste-polyvinylidene-chloride-pvdc-value-added-products-batch02018nas a2200217 4500008004100000022001400041245012900055210006900184260000800253490000800261520122400269653002201493653001601515653002301531653001901554653002701573100002801600700001801628700002401646856013001670 2026 eng d a0018-019X00aElectrochemical generation of N-centered radicals and their reactivity toward cyclization and subsequent C―C bond cleavage0 aElectrochemical generation of Ncentered radicals and their react cAPR0 v1093 a

N-containing heterocycles are widely used in medicinal chemistry, and they can be synthesized efficiently by the intramolecular cyclization of N-centered radicals. Furthermore, N-centered radicals also act as excellent hydrogen atom transfer (HAT) reagents. On the other hand, nitrogen atoms in the nitrogen-containing heterocycles are used as a handle to cleave stable five and six-membered rings. However, the electrochemical generation of N-centered radicals and their application in forming heterocycles have been extensively studied. Study beyond cyclization remains largely unexplored; in this manuscript, we summarize our new findings as follows. Under electrochemical conditions, the N & horbar;H bond is cleaved, forming an N-centered radical that adds to the double bond in a 6-endo-trig cyclization fashion. The newly formed C-centered radical reacts with oxygen and undergoes C & horbar;C bond cleavage to form the corresponding carbonyl compounds. The reactivity is dependent on the substituents present on nitrogen. In the case of aromatic amine-derived amide, the TEMPO trapping cyclization product was isolated. A mechanism has been proposed to explain the formation of the products.

10aC-C bond cleavage10acyclization10aN-centered radical10aN-heterocycles10aoxidative ring opening1 aSuryawanshi, Sharad, M.1 aSingh, Mayuri1 aSamanta, Ramesh, C. uhttps://library.ncl.res.in/content/electrochemical-generation-n-centered-radicals-and-their-reactivity-toward-cyclization-and02202nas a2200205 4500008004100000022001400041245016200055210006900217260000900286490000700295520140500302653001901707653003401726653002201760653003201782653001801814100001801832700002401850856012201874 2026 eng d a1433-785100aUnveiling the electrochemical reactivity of urethane toward different bond formations and application to polyurethane deconstruction via C―N bond formation0 aUnveiling the electrochemical reactivity of urethane toward diff cMAR 0 v653 a

Plastics are essential, and their production is increasing. The rate of plastic recycling is extremely low, and end-of-life plastics are sent to landfills and oceans, which is alarming. Mechanical recycling is not a viable solution because it produces downgraded materials. Efficient methods for chemical recycling of plastics are essential. Polyurethane is a widely used plastic, and the presence of very stable carbamate functionality makes its recycling extremely difficult. Existing methods require expensive reagents and harsh reaction conditions, such as high temperature, high pressure, and precious metal catalysts such as iridium and ruthenium. Electrochemistry can potentially be used to develop sustainable methods that can operate under milder conditions using fewer reagents. We disclose that urethane serves as an efficient carbamoylation reagent under electrochemical conditions at lower temperatures to form C & horbar;N, C & horbar;P, and C & horbar;C bonds. This method works successfully to deconstruct commercially available polyurethane using different amines. Furthermore, the robustness of the method has been tested on daily life plastics made of polyurethane with additives, such as flexible tubing and mobile covers. This method has also been applied for polymer backbone editing by converting the urethane linkage to urea upon reaction with diamine.

10acarbamoylation10aelectroreduction of carbamate10apolymer upcycling10apolyurethane deconstruction10asustainabiliy1 aSingh, Adarsh1 aSamanta, Ramesh, C. uhttps://library.ncl.res.in/content/unveiling-electrochemical-reactivity-urethane-toward-different-bond-formations-and