Oxidative rearrangement of 4H-chromenes to 2-aroylbenzofurans in the presence of selenium dioxide-aroylbenzofurans and 2-aroylnaphtho[2,1-
b]furans via oxidative rearrangement of 2,4-diaryl-4Н-chromenes and 1
Calculation of nth Derivative with Minimum Error Based on Function’s MeasurementCalculation of nth Derivative with Minimum Error Based on Function’
s Measurement