Hydro-de-halogenation

Cagnoli R, Ghelfi F, Pagnoni UM, Parsons AF, Schenetti L. Hydro-de-halogenation and consecutive deprotection of chlorinated Al-amido-pyrrolidin-2-ones with Raney-Ni an effective approach to gahapentin. Tetrahedron 2003 59 (50) 9951 9960. 

Hydro-de-diazoniation seems to be an unnecessary reaction from the synthetic standpoint, as arenediazonium salts are obtained from the respective amines, reagents that are normally synthesized from the hydrocarbon. Some aromatic compounds, however, cannot be synthesized by straightforward electrophilic aromatic substitution examples of these are the 1,3,5-trichloro- and -tribromobenzenes (see below). These simple benzene derivatives are synthesized from aniline via halogenation, diazotization and hydro-de-diazoniation. Furthermore hydro-de-diazoniation is useful for the introduction of a hydrogen isotope in specific positions. 

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