Using the cyclohexane with the C's numbered as shown, draw a chair form that fits each description. 4 6 a. The ring has an axial CH3 group at C1 and an equatorial OH on C2. b. The ring has an equatorial CH3 group on C6 and an axial OH group on C4. c. The ring has equatorial OH groups on C1, C2, and C5.

Study Guide Questions Q7. Identify each Fischer projection as the D- or L-isomer H H - OH H-OH H-OH H-OH CH2OH HO- H HO CH₂OH C=0 - H OH -H CH₂OH

9. For the following compound: CI a) Is the alkene an E or Z stereoisomer? b) Provide the IUPAC name (including its E or Z designation) c) Why can't E and Z isomers easily interconvert?

just problem 5.26 please

5) For the molecule shown below, draw the indicated stereoisomers in the boxes. a) Draw a meso stereoisomer b) Draw a chiral stereoisomer H₂N Bri Br NH2 c) Circle the chiral centers in the original molecule

2. H,N но PE PC In order to synthesize PC from PE, PE is reacted with three S-adenosylmethionine (SAM) molecules, producing three S-adenosylhomoserines (SAH). Draw the chemical reactions leading from PE to PC, including the important intermediates. Use the arrow formalism. Feel free to abbreviate certain groups with R to avoid excessive drawing, but make sure to draw the full substrates and products with all atoms at least once. H2N H2N N- он он N' NH2 NH2 KH Нон он OH OH S-adenosylmethioning S-adenosylhomoserine