(a)
Interpretation:
The
Concept introduction:
Asymmetric catalytic hydrogenation is a reaction in which the alkene substrate is reduced to a saturated compound by addition of two atoms of hydrogen. When chiral catalyst is used a enantioselective product is obtained. This technique uses a chiral catalyst so that the amino acids can be prepared with high enantiomeric excess.
The final step after hydrogenation is the hydrolysis of the protected group of
To find: the alkene taken for the synthesis of L-alanine using asymmetric catalytic hydrogenation.
(b)
Interpretation:
The alkenes required for the synthesis of given set of amino acids by asymmetric catalytic hydrogenation need to be identified.
Concept introduction:
Asymmetric catalytic hydrogenation is a reaction in which the alkene substrate is reduced to a saturated compound by addition of two atoms of hydrogen. When chiral catalyst is used a enantioselective product is obtained. This technique uses a chiral catalyst so that the amino acids can be prepared with high enantiomeric excess.
The final step after hydrogenation is the hydrolysis of the protected group of amine. The general scheme can be shown as,
To find: the alkene taken for the synthesis of L-alanine using asymmetric catalytic hydrogenation.
(c)
Interpretation:
The alkenes required for the synthesis of given set of amino acids by asymmetric catalytic hydrogenation need to be identified.
Concept introduction:
Asymmetric catalytic hydrogenation is a reaction in which the alkene substrate is reduced to a saturated compound by addition of two atoms of hydrogen. When chiral catalyst is used a enantioselective product is obtained. This technique uses a chiral catalyst so that the amino acids can be prepared with high enantiomeric excess.
The final step after hydrogenation is the hydrolysis of the protected group of amine. The general scheme can be shown as,
To find: the alkene taken for the synthesis of L-tyrosine using asymmetric catalytic hydrogenation.
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Chapter 25 Solutions
ORGANIC CHEM PRINT STUDY GDE & SSM
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- Use the reaction coordinate diagram to answer the below questions. Type your answers into the answer box for each question. (Watch your spelling) Energy A B C D Reaction coordinate E A) Is the reaction step going from D to F endothermic or exothermic? A F G B) Does point D represent a reactant, product, intermediate or transition state? A/ C) Which step (step 1 or step 2) is the rate determining step? Aarrow_forward1. Using radii from Resource section 1 (p.901) and Born-Lande equation, calculate the lattice energy for PbS, which crystallizes in the NaCl structure. Then, use the Born-Haber cycle to obtain the value of lattice energy for PbS. You will need the following data following data: AH Pb(g) = 196 kJ/mol; AHƒ PbS = −98 kJ/mol; electron affinities for S(g)→S¯(g) is -201 kJ/mol; S¯(g) (g) is 640kJ/mol. Ionization energies for Pb are listed in Resource section 2, p.903. Remember that enthalpies of formation are calculated beginning with the elements in their standard states (S8 for sulfur). The formation of S2, AHF: S2 (g) = 535 kJ/mol. Compare the two values, and explain the difference. (8 points)arrow_forwardIn the answer box, type the number of maximum stereoisomers possible for the following compound. A H H COH OH = H C Br H.C OH CHarrow_forward
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