Lecture 13- end Ch.3

Lecture 13- end Ch.3 - CH310/318MSp.2011 Lecture13...

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Lecture 13 Polarimetry/ Optical Rotation Methods for Resolution End Ch. 3!! Begin Ch. 4: Acids and Bases : : : Announcements : : : Homework 3 up, due next Thursday Exam 1 regrade deadline: tuesday CH 310/318M – Sp.2011
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Last Time: V. Patman 2 Thurs 3.03.11 Meso:  an achiral compound with two or more chiral centers and an  internal mirror plane of symmetry.   Practice identifying meso compounds and determining relationships between  stereoisomers from different perspectives. Enantiomers have same chemical and physical properties  in the absence  of a chiral  environment. Diastereomers have different chemical and physical properties in achiral and chiral  environments. Polarimeter:  a device used to measure optical rotation of organic compounds CH 310/318M – Sp.2011
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Polarimetry Dextrarotatory:  Rotate plane polarized light to the right. (+) Levorotatory:  Rotates plane polarized light to the left. (-) Magnitude of rotation depends on temperature, [conc.], solvent, sample cell size   standardize. V. Patman 3 Thurs 3.03.11
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Polarimetry Racemic –  A 50:50 mixture of enantiomers. Is not optically active since the rotations  of the two enantiomers completely cancel  Optical purity:  A way of describing the composition of a mixture of enantiomers. Uses for Polarimetry:
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Lecture 13- end Ch.3 - CH310/318MSp.2011 Lecture13...

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