SOLN 1
1. formation of vicinal diol by OsO4 is not regioselective
2. Hydrogenation of alkene using Pd/H2 catalyst
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2. Write two reactions of alkene two reactions of alkene which are regioselective reactions. (apt 2pb=...
Chap 8 - Addition Reactions to Alkenes A reaction is regioselective when two or more constitutional isomers might be expected to reasonably form as products, but one of them predominates. tert-butyl chloride 100 iso-butyl chloride There are degrees of regioselectivity ranging from no regioselectivity to completely regioselective. The top example is a completely regioselective reaction. (reason: 3° carbocation vs 1° carbocation). The greater the differences in the AG" value between two different carbocation pathways, the more regioselective the reaction will...
1. Predict the products of the following reactions. CH3 TsCl Pyridine NaCN CH3 PBr3 Pyridine NaCN (1) BH3:THF (2) H2O2,OH H2SO4(cat.) H2O (1) Hg(OAc)2 (2) NaBH/OH 2. Write the mechanism of the following reactions он но он Ph BF3 Ph
Predict the products, if any, of the following reactions. COOH (1) LiAlH (2) H2O* (b) CH B (1) NaCN (2) 40*, heat (1) SOCI2 (a) oct-4-ino KMnO4 H20 (warm , conc.) (2) AICI COOH Ph 10 O Na,Cr,O, H,SO4 BH CH,OHN_C6:0, 14,50. CHCH.–CH-COOH BH, CH,OH (1) CH,CH, -CH-COOH CH,OH KMnO4, H2O (warm, conc.) KMnO,H,O (hot , conc.)
X y Draw the two alkene products of this dehydrohalogenation and circle the one major. Draw the two alkene products of this dehydrohalogenation and circle the one that is major. 35. When trans-1-bromo-2-methyl cyclohexane is dehydrohalogenated, it forms only one alkene. Draw its structure. 36. CH3 CH НО* - CH2=C + CH3 -C-OH H2O CH3 CHз Write a 3-step mechanism for this dehydration.
Which of the following is true of the mechanism of
BH3 addition to an alkene?
Select one:
a. BH3 adds to alkene by formation of a
strained 3-membered ring intermediate.
b. B-H adds to C=C in a concerted, SYN
addition.
c. B-H adds to C=C in a step-wise, SYN
addition.
d. B-H attaches to alkene with ANTI
stereochemistry.
What is the organic product formed in the following sequence of reactions? CH2 (1) HgOAcz + H2O V (2) NaBH4 2) NAB...
Question 19 Identify the correct reactant necessary for the reaction shown below. Question 20 Which of the reactions shown below would be regioselective? (choose all correct answers) H-CI Bry, H,O Bra 1. BH3, H2O, THE 2. H2O2, OH, H2O
Which of the following addition reactions are stereospecific? (a) Cl2 addition to a disubstituted alkene (b) HBr addition to a trisubstituted alkene (c) Radical addition of Cl2 to CH4 (d) Oxidation of a trisubstituted alkenes by using O3, Zn and H2O (e) Two of the above
1. Classify the following reactions as: (Addition,
Substitution and Elimination)
2. For the following alkene: (1) Give the main product and
side products in each of the chemical reactions illustrated. Do not
forget to indicate the stereochemistry of the products when
relevant.
Brz CCl4. calor 2 H2 Pt HO- A A + HBO Br d. n coon Sola coal COCI (1) BH2-THF (2) HOM/HO- HBO H2O H2SO4 Cl2 H2O Brz CCl4
2. Predict the product(s) using the same alkene reactant for the following reactions: H,O, hv H5OH,O 1, HE. THI -H0 2. NaBH,/NaOH 1. B H/THF 2. H.O./NaOH KMnO /H,0 cold 1. Oso 2. NaHSO 1. KMnO/OH heat 2. H,0 1. O,/CH,CI, 2. Zn/H,0 1.0, 2. H,O/OH
Given the standard enthalpy changes for the following two reactions: (1) 2Pb(s) + O2(g) 2PbO(5) AH° = -434.6 kJ (2) Pb(s) + Cl2(g) →PbCl(s) AH° = -359.4 kJ what is the standard enthalpy change for the reaction: (3) 2 5C12(3) + O2(g)—2PbO(s) + 2Cl2(9) AH° = ?