Friday, November 16, 2007
DEPT and DEPTQ
Many of you run both standard 13C and 13C DEPT-135 spectra of your compounds. This may take a considerable period of time (and cost a considerable amount of money) if your sample is dilute. You can run a single DEPTQ-135 spectrum of your compound and get the same amount of information. This may save a great deal of spectrometer time. A DEPTQ-135 spectrum is the same as a DEPT-135 spectrum except the quaternary carbons are present and 180 degrees out of phase with respect to the CH and CH3 carbons. Note also that the commonly used deuterated solvents will show up in a DEPTQ spectrum and can be used for chemical shift referencing. Below is the standard 13C spectrum, the DEPT-135 spectrum and the DEPTQ-135 spectrum of ethylbenzene.