The gamma-effects are useful in cases of geometric isomerism and are typically upfield, while further substituent effects are generally negligible.  
The gamma-effects are useful in cases of geometric isomerism and are typically upfield, while further substituent effects are generally negligible.  Proton-decoupling shows no splitting at all, while proton-coupling allows one to determine the number of attached hydrogens.  Deltas beyond 200 generally indicate aldehydes and ketones, as the chemical shifts are much greater than a similiar technique.  FTP, name this spectroscopic technique often used as in conjunction with proton magnetic resonance.
The gamma-effects are useful in cases of geometric isomerism and are typically upfield, while further substituent effects are generally negligible.  
CMR spectroscopy or Carbon NMR or Carbon-13 Nuclear Magnetic Resonance spectroscopy