4,5‐Dihydro‐1,2,3‐oxadiazole: A Very Elusive Key Intermediate in Various Important Chemical Transformations

C(sp2)-H Hydroxylation via Catalytic 1,4-Ni Migration with N2O

Herein, we report a Ni-catalyzed C(sp2)-H hydroxylation of aryl bromides with N2O as an oxygen-atom donor. The reaction is enabled by a 1,4-Ni translocation that results in ipso/ortho difunctionalized products. Regioselectivity and stereocontrol are dictated by a judicious choice of the ligand backbone, thus giving access to either carbonyl or phenol derivatives and offering an opportunity to repurpose hazardous substances en route to valuable oxygen-containing building blocks.

Experimental observation and quantum chemical investigation of thallium(i) (Z)-methanediazotate: synthesis of a long sought and highly reactive species

Thallium(i) (Z)-methanediazotate has been synthesised through TlOPr induced cleavage of ¹⁵N-labelled N-methyl-N-nitrosourea, and confirmed by NMR analysis. CCSD(T)/CBS calculations reveal a kinetic product control.