Markownikoff’s addition

In the case of terminal C=C (1,2 addition units), i.e. when R=R =H and R" (or R111) = polymer chain, two types of hydride migration are possible, namely (i) The Markownikoff s addition which would lead to the formation of B type repeating units and (ii) The anti Markownikoff s addition which would result in the formation of the observed repeating units C. In the case of Markownikoff s type addition the hydride transfer occurs to Ca and results in the formation of branched alkyl-rhodium intermediate complex shown by Structure 2. Whereas when anti Markownikoff s addition occurs, the resulting intermediate alkyl-rhodium complex has linear alkyl ligand as shown by Structure 3. 

Anethole on treatment with hydrogen bromide undergoes Markownikoff s addition to yield anethole hydrobromide. The resulting product in the presenee of sodamide and liquid ammonia gives an intermediate produet which on subsequent demethylation followed by isomerization in alkali yields the official compound. 

In the case of Markownikoff s addition the hydride transfer occurs on carbon and a branched alkyl-rhodium complex is formed on the other hand, in the case of the anti-Markownikoff s... 

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See also in sourсe #XX -- [ ]

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