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Write the introduction of Nicholas reaction, mechanism, cobalt stability, carbocation at propargylic side.

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1. Introduction
In 1972, Nicholas et al. reported (Nicholas et al., 1972, p. C21) an important organometallic reagent involving cobalt which is useful in derivatization of alkynes having alcohol or ether. In past several reviews were written on this name reaction showing its importance in organic chemistry (Nicholas, 1987, p. 207; Teobald, 2002, p. 4133; Green, 2001, p. 809). This reaction also explored for the synthesis of bioactive compounds (Diaz, Betancort, & Martin, 2007, p 343).
The reaction involves Lewis acid catalyzed attack of nucleophile at the dicobalt octacarbonyl-stabilized propargylic cation and later on through oxidative demetallation, it...

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