Alkane C-H Deformation Vibrations

The CHi symmetric deformation band is of medium intensity in infrared spectra and weak in Raman, unless directly adjacent to an unsaturated group, a carbonyl group or an aromatic. 

The CH2 wagging, rocking and twisting vibrations which occur in the region 1430-715 cm are usually of weak intensity in infrared spectra and of 

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Alkane Group Residues C-H Group Alkane C-H Deformation Vibrations... 

Table 2.2 Alkane C-H deformation vibrations for alkane functional groups as part of a residual saturated hydrocarbon portion of molecule (attached to a carbon atom)...

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