quaternary carbon atom


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qua·ter·nar·y car·bon at·om

an atom of carbon to which four other carbon atoms are attached.
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The DEPT (Distortionless enhancement by polarization transfer) and 13 C NMR spectra indicated the presence of only one quaternary carbon atom resonating at IC 139.2 ppm, a number of signals due to methylene functions including two signals appeared at IH/IC2.93 (t, J= 7.2 Hz)/43.5 and at IH/IC3.68 (m) and 3.53 (dd, 14.0, 7.2 Hz)/66.6, and no signal due to methyl function was observed.
The DEPT and 13 C NMR spectra indicated the presence of only one quaternary carbon atom resonating at IC 139.2 ppm, a number of signals due to methylene functions including a signal appeared atIH/IC 2.90 (t, J= 7.2 Hz)/41.6 and no signal due to methyl function was observed.
The spectra revealed the presence of six methyl, nine methylene, ten methine and four quaternary carbon atoms.
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