a. Rank the indicated protons in increasing order of chemical shift. Fill in the boxes with the correspondants letters to the indicated hydrogens. b. Explain your choice of chemical shifts order for protons He and Ha. H₂ Ha Ha H₂ 8H < SH < SH < SH H₂ < SH

Explain the relative chemical shifts of the benzene ring protons in Figure

Total number of stereoisomers possible for the following compounds is HINT: a. 4 How many possible stereoisomers? How do we know how many stereoisomers are possible for a given structure? There is actually a straightforward way to figure this out. All we need to do is count the number of chiral centers and stereogenic alkene groups, the use this following rule: number of stereoisomeric forms = 2" ... where n = the number of chiral centers plus the number of stereogenic alkene groups b. 2 Consider for example a molecule with two chiral centers and one stereogenic alkene. By the rule stated above, we know right away that there must be eight possible stereoisomers. terminal alkene OH stereogenic alkene C. 8 OH d. 3 OH chiral center HO OH 3 2 = 8 T nonstereogenic alkenes (cannot be labelled E or Z) ←

A 300-MHz spectrometer records a proton that absorbs at a frequency 2130 Hz downfiled from TMS.

Predict the chemical shift of the following compounds?   find out different types of protons and give their  approximate chemical shift values based on their shielding and de shielding.

3. Homework Help

3. Protons A-E are identified on the spectrum below and correspond to the five unique protons in the molecule shown. (a) Place all the protons on the molecule and categorize them into Ha, Hb, etc. (b) Fill in the table for this molecule (see answer sheet). Br E D C 3 PPM -N B A