This refers to aldehydes with substituents attached to both alpha (α) carbon atoms, which are the carbon atoms directly attached to the carbonyl group. The presence of these substituents can significantly affect the reactivity of the aldehyde.
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(R)-1-(1-nitro-4-phenylbutan-2-yl)cyclopentanecarbaldehyde
(R)-2,2-dimethyl-4-nitro-3-(3-nitrophenyl)butanal
