 
 <prompt> Wetin dey special about di reactions of 1899? Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: There plenty important organozinc compounds. Organozinc chemistry na di science of organozinc compounds wey dey describe their physical properties, synthesis and reactions. Among important applications na di Frankland-Duppa Reaction wey involve oxalate ester(ROCOCOOR) wey dey react with alkyl halide R'X, zinc and hydrochloric acid to form α-hydroxycarboxylic esters RR'COHCOOR, di Reformatskii reaction wey convert α-halo-esters and aldehydes to β-hydroxy-esters, di Simmons–Smith reaction wey involve carbenoid (iodomethyl)zinc iodide wey react with alkene(or alkyne) and convert dem to cyclopropane, di Addition reaction of organozinc compounds to carbonyl compounds. Di Barbier reaction (1899) na di zinc equivalent of di magnesium Grignard reaction and e better pass di two. If water dey around di formation of organomagnesium halide go fail, but di Barbier reaction fit happen even if water dey. But di downside be say organozincs no too dey nucleophilic like Grignards, dem dey expensive and hard to handle. Di ones wey dey commercially available na dimethylzinc, diethylzinc and diphenylzinc. For one study, di active organozinc compound dey come from cheaper organobromine precursors: 