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The anti-Markovnikov rule can be illustrated using the addition of hydrogen bromide to isobutylene in the presence of benzoyl peroxide or hydrogen peroxide. The reaction of HBr with substituted alkenes was prototypical in the study of free-radical additions. Early chemists discovered that the reason for the variability in the ratio of ...
In 1869, a Russian chemist named Vladimir Markovnikov demonstrated that the addition of HBr to alkenes usually but not always resulted in a specific orientation. Markovnikov's rule, which stems from these observations, states that in the addition of HBr or another hydrogen halide to an alkene, the acidic proton will add to the less substituted carbon of the double bond. [3]
Vladimir Markovnikov was born on December 22, 1837, in Chernorechye near Nizhny Novgorod, Russian Empire (now Dzerzhinsk, Nizhny Novgorod Oblast, Russian Federation). Soon after his birth, his father retired and settled in a family estate received as a dowry from his wife's family at marriage, in the village of Ivanovo, Knyagininsky district of the Nizhny Novgorod province, where Markovnikov ...
Throughout the history of the Soviet Union, tens of millions of people suffered political repression, which was an instrument of the state since the October Revolution.It culminated during the Stalin era, then declined, but it continued to exist during the "Khrushchev Thaw", followed by increased persecution of Soviet dissidents during the Brezhnev era, and it did not cease to exist until late ...
With the collapse of other communist governments, and increasing street protests, the Communist Party of Czechoslovakia announced on 28 November 1989 that it would relinquish power and dismantle the single-party state. Barbed wire and other obstructions were removed from the border with West Germany and Austria in early December.
As part of the foreign policy goals in Europe, Russia initially gave guarded support to France's anti-Austrian diplomacy. A weak Franco-Russian entente soured, however, when France backed a Polish uprising against Russian rule in 1863. Russia then aligned itself more closely with Prussia by approving the unification of Germany in exchange for a ...
Russia also agreed to Europe's demand to "assist persons deported from the occupied Baltic states" upon joining the Council of Europe in 1996. [ 132 ] [ 133 ] [ 134 ] Also, when the Russian Soviet Federative Socialist Republic signed a separate treaty with Lithuania in 1991, it acknowledged the 1940 annexation as a violation of Lithuanian ...
Russia in 1914 Demographics of pre-WW1 European countries. The central development in Russian foreign policy was to move away from Germany and toward France. Russia had never been friendly with France, and remembered the wars in the Crimean and the Napoleonic invasion; it saw Paris as a dangerous front of subversion and ridiculed the weak governments there.