C-13 NMR Query in 2-Aminobutane: C3 Resonance

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In 2-aminobutane, the chemical shift of C3 is observed at a lower field (approximately 33 ppm) compared to C1 (around 23 ppm). This phenomenon raises questions about the underlying reasons for this shift. The discussion suggests that the inductive effect from the C4 carbon could increase electron density around C3, potentially shifting it upfield relative to C2. Additionally, the steric effects between the amine group and C4 may also play a role in influencing the chemical shifts. Overall, the interplay of inductive and steric effects is central to understanding the observed chemical shifts in this compound.
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In 2-aminobutane, C3 resonates at lower field (ca 33ppm) compared to C1 (ca 23ppm). Is there a simple rationale for this? The extra inductive effect from C4 should increase electron density around C3 and so shift it upfield compared to C2? Any thoughts/answers greatly appreciated.
 
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Steric effect between amine group and C4?
 

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