#"Diacid halide + hydride transfer reagent "rarr" Dialdehyde"#
#Li^+[HAl(OBu^t)_3]^-# is a hydride transfer reagent that delivers 1 hydride instead of the 4 that lithium aluminum hydride (#LiAlH_4#) delivers. it will react with acid halides to give the formyl species, the aldehyde:
#"Diacid halide + hydride transfer reagent"##rarr##"Dialdehyde + lithium chloride"#