Benzoic acid occurs naturally as do its esters in many plant and animal species. Appreciable amounts have been found in most berries (around %). Ripe fruits of several Vaccinium species (., cranberry , V. vitis macrocarpon ; bilberry , V. myrtillus ) contain as much as –% free benzoic acid. Benzoic acid is also formed in apples after infection with the fungus Nectria galligena . Among animals, benzoic acid has been identified primarily in omnivorous or phytophageous species, ., in viscera and muscles of the rock ptarmigan ( Lagopus muta ) as well as in gland secretions of male muskoxen ( Ovibos moschatus ) or Asian bull elephants ( Elephas maximus ). 
DIBAL is useful in organic synthesis for a variety of reductions, including converting carboxylic acids , their derivatives, and nitriles to aldehydes . DIBAL efficiently reduces α-β unsaturated esters to the corresponding allylic alcohol.  By contrast, LiAlH 4 reduces esters and acyl chlorides to primary alcohols , and nitriles to primary amines [use Feiser work-up procedure]. DIBAL reacts slowly with electron-poor compounds, and more quickly with electron-rich compounds. Thus, it is an electrophilic reducing agent whereas LiAlH 4 can be thought of as a nucleophilic reducing agent.