21. Which of the following could result from the dehydration of an aldol? (A) 4-methyl-3-penten-2-one (B) 4-methyl-4-penten-2-one (C) 4-methyl-5-hexen-2-one (D) 4-methyl-4-hexen-2-one (E) 3-methyl-4-penten-2-one

4. trans-1-tert-Butyl-4-isopropylcyclohexane has two conformers. Using the following data to calculate the strain in this two conformers, by how much kJ/mol that one is favored than the other?If, H-C-C-H eclipsed interaction strain: 4 kJ/mol;CH3-C-C-H eclipsed interaction strain: 6 kJ/molCH3-C-C-CH3 eclipsed interaction strain: 11 kJ/mol;CH3-C-C-CH3 gauche interaction strain: 3.8 kJ/mol Each one strain (S) of 1, 3-X-H diaxial interaction in monosubstitutedcyclohexane (kJ/mol): (A) 9.2 (B) 22.8 (C) 32 (D) 16 (E) 11.4

21. Which of the following could result from the dehydration of an aldol?
(A) 4-methyl-3-penten-2-one
(B) 4-methyl-4-penten-2-one
(C) 4-methyl-5-hexen-2-one
(D) 4-methyl-4-hexen-2-one
(E) 3-methyl-4-penten-2-one

相關試題

相關試卷