A Co(NO3)2 method to promote cyclization of benzoyl hydrazone for the formation of 2,5-diphenyl-1,3,4-oxadiazoles has been developed. The reaction proceeded smoothly and was promoted by Co(NO3)2 under air at 110 °C in DCE; 16 examples of products were obtained.

The surface of LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NCM811) cathode is coated with Li 4 Ti 5 O 12 with a thickness of 10-12 nm by the solvent evaporated calcination method to generate T2-NCM811 cathode, which significantly reduces the particle cracking. The cyclic stability of the T2-NCM811 cathode is greatly improved by particle-stabilized structure. After 500 cycles between 2.8 and 4.3 V, its capacity retention rate is 83%, which is higher than that of NCM811 (67%). This cyclic stability is attributed to the inhibition of secondary crystal cracking by the coating, which the structure of the particles is kept stable in a long period and protects the internal particles from harmful electrolytes. The discharge capacity of NCM811 cathode at 10C is 92.6 mAh g −1 , while that for T2-NCM811 cathode raises to 111.5 mAh g −1 . This is because a certain amount of Ti 3+ /Ti 4+ doping to the surface of NCM811 reduces Li/Ni mixing and increases the lattice parameters on the surface of material; this helps to accelerate the electronic conductivity and enhance the transport of Li + .

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The title compound, C19H17NO3, was synthesized using a tandem annulation reaction between 4-benzoyl-1H-pyrrole-2-carbaldehyde and (E)-ethyl 4-bromo­but-2-enoate under mild conditions. The dihedral angle between the benzene ring and the indolizine ring system is 41.73 (4)°.