Question

15) What synthetic goal is achieved by subjecting an alkene to BH3-THF, followed by oxidative working using H2O2 and NaOH? A) Markovnikov addition of water where relative stereochemistry is preserved B) Markovnikov addition of water where relative stereochemistry is scrambled (or destroyed) C) Anti-Markovnikov addition of water where relative stereochemistry is preserved D) Anti-Markovnikov addition of water where relative stereochemistry is scrambled (or destroyed) 16) Which of the following reaction occur by anti-addition to an alkene? A) Br2 B) BH3-THF, then H2O2, NaOH C) CH3CO3H D) O3, then (CH3)2S 17) Treatment of cyclopentene with CH3CO3H acid _? A) Results in oxidative cleavage of the ring to produce an acyclic compound B) Yields a meso epoxide C) Yields an equimolar mixture of enantiomeric epoxides D) Give the same product as treatment with cyclopentene with HBr