Please answer all.
D. 1. Make a model of cis-1,3-dimethylcyclohexane Draw this structure in the chair form. 2. Flip to the other chair form. Draw this chair structure. 3. Is there any difference in the energies between the two conformations? Explain.
Draw the structure of the polysaccharide alpha-D-Glucopyranosyl- 1-> 3- beta-D-mannopyranosyl – 1->6 - alpha-D-fructopyranose in the chair and Haworth configuration, showing the appropriate glycosidic linkages. Does this polysaccharide have free anomeric hydroxyl groups? If so, circle them in the structure you have drawn.
6). Draw the zig-zag structure of C-2 epimer and C-3 epimer of D-glucose. Draw one possible chair conformer of C-2 epimer.
6). Draw the zig-zag structure of C-2 epimer and C-3 epimer of D-glucose. Draw one possible chair conformer of C-2 epimer.
Chair Forms of Substituted Cyclohexanes For each structure or name below, draw both chair forms of the compound and indicate which of the two is more stable. Consult the table of A values here. 16. 1-tert-butyl-1-methylcyclohexane Ph 19. 17. trans-1,3-dibromocyclohexane 18. Cl 20. OH
4. Construct a model of 1-chlorocyclohexane in the most stable chair conformation and draw the structure below: a. Is this molecule chiral? How did you arrive at your answer? 35
Draw the most stable isomer by Newman projection and chair
structure of the ring.
1. Draw (1S,3S)-3-aminocyclohexanecarbonitrile structure below: 2. Draw the two chair conformations of the above disubstituted cyclohexane compound, before and after ring-flip. 3. Draw the Newman projections of both chair conformations about the C1−C6 and C3−C4 bonds. 4. Which conformation is the least stable one? Briefly explain your answer with words AND by showing it on the appropriate Newman projection.
(a) Draw the structure of the two chair forms of methylcyclohexane. Draw in all bonds (even the C-H bonds). Be sure the axial and equatorial bonds are shown correctly. On the appropriate structure, indicate the 1,3-diaxial interactions involving the methyl group. (b) Which is more stable, trans-1,3-dimethylcyclohexane or cis-1,3-dimethylcyclohexane? Why?
(a) Draw the structure of the two chair forms of methylcyclohexane. Draw in all bonds (even the C-H bonds). Be sure the axial and equatorial bonds are shown correctly. On the appropriate structure, indicate the 1,3-diaxial interactions involving the methyl group. (b) Which is more stable, trans-1,3-dimethylcyclohexane or cis-1,3-dimethylcyclohexane? Why?
Draw the 3-D structures for the two compounds given below. For molecule A, draw the chair form, determine the number of chiral carbons and the absolute configuration for all of the chiral carbons. For molecule B, determine the number of stereoisomers, draw the 3-D structure of the 2S, 3R, 5S form of the molecule and give the correct name. Importantly, "place appropriate R or S symbols within the immediately proximity of the appropriate chiral carbon center and place your answers...