text: Alexander Nikiforovich Popov ( 1840 – 18 August 1881) was a Russian organic chemist. He taught chemistry at the University of Kazan and at the University of Warsaw. He discovered what is now called Popovs Rule (or Popoffs Rule) which states that in the oxidation of an unsymmetrical ketone, the cleavage of the C−CO bond so that the smaller alkyl group is retained.
  Popov was born in Vitebsk where his father was a military officer. He studied at Kazan University and attended the chemistry lectures of A.M. Butlerov. Graduating in 1865 he worked as a chemical lab assistant and in 1868 received a masters degree and became a professor at the University of Warsaw. In 1871 he went to work in Bonn with August Kekulé and E.K. Theodor Zinkce. It was during this period that he established the so-called Popovs Rule on the oxidation of benzene homologues being directed to the carbon atom bonded directly to the ring. He received a doctorate in 1872 for work on ketone oxidation. He identified an ordering of stability of radicals based on his examination of oxidation of asymmetric ketones which has been called Popov's rule. He served in the Russo-Turkish War (1877-1878). He introduced the use of potassium dichromate (KCrO) and sulphuric acid as oxidation reagent in organic analysis.