Guided course 02:15Recognizing chiral molecules with zero chiral centers.Johnny Betancourt2109views14rank1comments
Guided course 01:22Determining if substituted biphenyls are chiral or not.Johnny Betancourt1182views6rank3comments
Guided course 00:29Is the following substituted biphenyl chiral?Johnny Betancourt1170views7rank1comments
Guided course 00:45Is the following substituted biphenyl chiral?Johnny Betancourt992views9rank4comments
Textbook QuestionThe original definition of meso is 'an achiral compound that has chiral diastereomers.' Our working definition of meso is 'an achiral compound that has chiral centers (usually asymmetric carbon atoms).' The working definition is much easier to apply, because we don't have to envision all possible chiral diastereomers of the compound. Still, the working definition is not quite as complete as the original definition. 1. Show how cis-cyclooctene is defined as a meso compound under the original definition, but not under our working definition. [Review FIGURE 5-19 ]918views
Textbook QuestionDraw three-dimensional representations of the following compounds.Which have asymmetric carbon atoms? Which have no asymmetric carbons but are chiral anyway?Use your models for parts (a) through (d) and any others that seem unclear.g. <IMAGE>314views
Textbook Question(••••) A compound with two chiral centers that is meso will always have opposite absolute configurations at the two chiral centers. That is, a meso compound will never be (R,R) or (S,S); instead, it will be (R,S). Explain why this must be true.452views
Textbook QuestionWhich of the following compounds has a stereoisomer that is a meso compound? C 2,4-dimethylpentane D 1,3-dichlorocyclohexane617views
Textbook QuestionWhich of the following compounds has a stereoisomer that is a meso compound? A 2,4-dibromohexane B 2,4-dibromopentane560views
Textbook QuestionWhich of the following has an achiral stereoisomer? A 2,3-dichlorobutane B 2,3-dichloropentane628views1rank
Textbook QuestionWhich of the following compounds are chiral? Draw each compound in its most symmetric conformation, star (*) any asymmetric carbon atoms, and draw any mirror planes. Label any meso compounds. You may use Fischer projections if you prefer. c. (2R,3S)-2-bromo-3-chlorobutane d. (2R,3S)-2,3-dibromobutane930views
Textbook QuestionFor each structure,1. star (*) any asymmetric carbon atoms.2. label each asymmetric carbon as (R) or (S).3. draw any internal mirror planes of symmetry.4. label the structure as chiral or achiral.5. label any meso structures.e. <IMAGE>249views
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