68. Which of the following compounds can adopt a chair conformation in which there are no axial meth
71. Which of the following series of synthetic steps could be used to carry out the transformation s
65. What is the relative reactivity of 2° vs 1° hydrogens in the free radical bromination of n-butan
66. Which sequence of reagents works best to convert 1-methyl-1-vinylcyclohexane toE-1-methyl-1-(pro
72. What is the name of the following reaction? (A) Mixed Aldol condensation (B) Mixed Claisen conde
67. How many of these reagents cause only syn additions to alkenes?HBr H2, Pd BH3 H2O2 CH3CO3H Br2 H
68. The HOMO of (2E,4Z,6E)-octatriene undergo thermal cyclization using which process and which prod
49. Which of the following synthetic procedures would be employed most effectively to transform etha
69. Assuming kinetic conditions, provide a structure for the major product of the reaction below. In