In one application t-Bu-P4 is employed in a nucleophilic addition converting the pivaldehyde to the alcohol:
2.
Pivaldehyde is an example of an aldehyde with a sterically bulky R group, the " tertiary "-butyl group ( with 3 methyl groups, at lower left in the image ), attached to the carbonyl, > C = O . By definition, the other " group ", R', is a hydrogen ( H ) atom, shown here pointing directly upward.
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