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1. Ni-catalyzed 1,2-benzylboration of 1,2-disubstituted unactivated alkenes

   https://doi.org/10.1039/C9SC04199K  

   Joung, Seewon; Bergmann, Allison M.; Brown, M. Kevin (December 2019, Chemical Science)

   Nickel-catalyzed 1,2-carboboration of alkenes is emerging as a useful method for chemical synthesis. Prior studies have been limited to only the incorporation of aryl groups. In this manuscript, a method for the 1,2-benzylboration of unactivated alkenes is presented. The reaction combines readily available alkenes, diboron reagents and benzylchlorides to generate synthetically versatile products with control of stereochemistry. The utility of the products as well as the mechanistic details of the process are also presented. 

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2. Spirocyclic Products via Carbene Intermediates from Thermolysis of 1,2-Dialkynylpyrrole and 1,2-Diethynylimidazole

   https://doi.org/10.1055/s-0041-1737937  

   Jewett, Ashley L.; Bondoc, Joshua A.; Gilbreath, Bradford L.; Reinus, Brandon J.; Kerwin, Sean M. (April 2022, Synlett)

   Abstract The thermal rearrangements of 1,2-dialkynylimidazoles have been shown to lead to trapping products of cyclopenta[b]pyrazine carbene intermediates. Here we show that a similar rearrangement also occurs in the case of 1,2-diethynyl-1H-pyrrole, and that trapping the intermediate cyclopenta[b]pyridine carbene with solvent THF affords an ylide that undergoes a Stevens rearrangement to a spirocyclic product. An analogous rearrangement and trapping is observed for thermolysis of 1,2-dialkynylimidazoles in THF or 1,4-dioxane. 

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3. trans -Diamminebis(1,2-dicyanoethene-1,2-dithiolato)platinum(IV)

   https://doi.org/10.1107/S2414314620009803  

   Siddiqui, Mahaa J.; Nesterov, Volodymyr V.; Steidle, Matthew T.; Smucker, Bradley W. (July 2020, IUCrData)

   The title compound, [Pt(C 4 N 2 S 2 ) 2 (NH 3 ) 2 ], represents an octahedral platinum(IV) complex with two trans- ammine and two mnt (mnt = 1,2-dicyanoethene-1,2-dithiolato) ligands. The Pt—N and Pt—S distances are consistent with those in other platinum(IV) complexes. As a result of a slight canting of the coordination of the mnt ligand to the platinum(IV) atom, the nitrile nitrogen atoms are positioned suitably to hydrogen-bond with adjacent ammines. 

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4. Net-1,2-Hydrogen Atom Transfer of Amidyl Radicals: Toward the Synthesis of 1,2-Diamine Derivatives

   https://doi.org/10.1021/jacs.3c04376  

   Jiang, Yonggang; Liu, Dongxiang; Rotella, Madeline E; Deng, Guogang; Liu, Zhengfen; Chen, Wen; Zhang, Hongbin; Kozlowski, Marisa C; Walsh, Patrick J; Yang, Xiaodong (July 2023, Journal of the American Chemical Society)
5. Crystal structure and photoreactivity of a halogen-bonded cocrystal based upon 1,2-diiodoperchlorobenzene and 1,2-bis(pyridin-4-yl)ethylene

   https://doi.org/10.1107/S2053229620006233  

   Bosch, Eric; Battle, Jessica D.; Groeneman, Ryan H. (June 2020, Acta Crystallographica Section C Structural Chemistry)

   null (Ed.)

   The formation of a photoreactive cocrystal based upon 1,2-diiodoperchlorobenzene ( 1,2-C 6 I 2 Cl 4 ) and trans -1,2-bis(pyridin-4-yl)ethylene ( BPE ) has been achieved. The resulting cocrystal, 2( 1,2-C 6 I 2 Cl 4 )·( BPE ) or C 6 Cl 4 I 2 ·0.5C 12 H 10 N 2 , comprises planar sheets of the components held together by the combination of I...N halogen bonds and halogen–halogen contacts. Notably, the 1,2-C 6 I 2 Cl 4 molecules π-stack in a homogeneous and face-to-face orientation that results in an infinite column of the halogen-bond donor. As a consequence of this stacking arrangement and I...N halogen bonds, molecules of BPE also stack in this type of pattern. In particular, neighbouring ethylene groups in BPE are found to be parallel and within the accepted distance for a photoreaction. Upon exposure to ultraviolet light, the cocrystal undergoes a solid-state [2 + 2] cycloaddition reaction that produces rctt -tetrakis(pyridin-4-yl)cyclobutane ( TPCB ) with an overall yield of 89%. A solvent-free approach utilizing dry vortex grinding of the components also resulted in a photoreactive material with a similar yield. 

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