8. In real life, NMR samples often contain impurities, so extra signals will appear on your spectrum that are not related to your product. The document "Common NMR impurities" lists some common...

Extracted text: 8. In real life, NMR samples often contain impurities, so extra signals will appear on your spectrum that are not related to your product. The document "Common NMR impurities" lists some common impurities and their NMR data. Here are some instructions for reading this document: o Use Table 1 on page 2 of the document, focusing on the column for CDCI3. (This is the NMR solvent we are using.) o The impurities are listed in the first column. o The "mult" column tells you the multiplicities those signals should have. • s = singlet, d = doublet, t = triplet, q = quartet, etc. o The numbers in the table are the chemical shifts that certain impurities appear at. o For example, if diethyl ether is present in your sample, you should see two signals: a triplet at 1.21 ppm and a quartet at 3.48 ppm.


Extracted text: Complete this table for some of the possible impurities that could appear in NMR spectrum experiment. Chemical shifts (ppm) and multiplicities of impurity peaks Identity of impurity 1.56, singlet acetone 3.21, singlet; 1.19 singlet 2.45, quartet; 2.14, singlet; 1.06, triplet Note: tert-butyl methyl ether and butanone are two solvents we will use in this experiment that are not included in the "Common NMR impurities" document. The spectrum of each is shown below. Determine which 'H NMR spectrum is of tert-butyl methyl ether and which is of butanone, then fill in the last two rows in the table above. 11 10 6. 4 10 7 5 4 3 ppm ppm HOP-3-535 HP-00-105