{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

D l nomenclature eg d sugars l amino acids older

Info icon This preview shows pages 6–10. Sign up to view the full content.

View Full Document Right Arrow Icon
D, L nomenclature (e.g., D-sugars, L-amino acids ) – older nomenclature derived from D(R)- and L(S)-glyceraldehyde.
Image of page 6

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7 or racemic mixture Specific Rotation ! ! l x c t " = [ α ] = specific rotation t = temperature (ºC) (usually 25ºC) λ = wavelength of light (sodium D line, D = 589 nm) α = observed optical rotation (degrees) l = length of container in dm (usually 1 dm = 10 cm) c = concentration (g/mL)
Image of page 7
8 If an optically pure molecule has A specific rotation of +10 ° , its mirror image has a specific rotation of -10 ° . Optical activity is shown by samples of pure chiral compounds or by mixtures where one enantiomer is in excess
Image of page 8

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
9 A single enantiomer is optically pure A racemic mixture is a 50:50 mixture of enantiomers (optically active molecules but in equal amounts) Enantiomeric excess (ee) is defined by: enantiomer pure of rotation specific rotation specific observed ee = Or ee = % of one enantiomer - % of the other enantiomer That is, an ee of 50 means that there is 75% of one enantiomer and 25% of the other. Molecular Recognition: Three Points of Contact Required
Image of page 9
10 (+) carvone is found in caraway seeds and (-) is found in spearmint oil. (+) limonene is in citrus fruits and (-) is in pine trees O Carvone Limonene
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern