Question

Previous bonus - Next bonus
Cram’s rule describes the conditions in which this property can be “induced” in additions. For 10 points each:
[10m] Name this property of reactions which preferentially form one of the R or S isomers. The degree of this property is often measured as a quantity abbreviated “ee” (“E-E”), and it results in a nonzero optical activity.
ANSWER: stereoselective [or enantioselective; or asymmetric; or word forms; accept stereospecific; prompt on chiral or selective]
[10h] In Cram’s original experiment, 1,2-diphenyl-1-propanone (“one two die-FEEN-ul one PRO-puh-known”) reacted with this compound, which produced the erythro isomer. This very powerful reducing agent named for two metals is stronger than sodium borohydride.
ANSWER: lithium aluminum hydride [or LAH; or LiAlH4]
[10e] Conversely, when Cram used a benzene substituted with this element to produce the same product, it favored the threo isomer. This halogen is uniquely a reddish-brown liquid at room temperature.
ANSWER: bromine [or Br]
<Chemistry>

Back to bonuses

Summary

Data

Notre DameWashU D001010
UIUC BPurdue A001010
Indiana BPurdue D0000
SIUE AUChicago B0101020
UChicago DUIUC D0101020
UIUC AIndiana A001010
UChicago AUIUC C001010
WashU BUChicago C10101030
Northwestern AWashU C10101030