B. The specific rotation of a pure substance is -5.90°. What is the percentage of this isomer in a mixture with an observed specific rotation of -2.95°?
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- For the following molecules: a. How many stereogenic centers are present? b. How many stereoisomers are possible for these molecules?If the sample of the pure R enantiomer of a molecule has a specific rotation of -40 degrees and your mixture of that molecule has an 82% ee S, what is the observed specific rotation of your sample?After an attempt to resolve a racemate into its enantiomers, the observed rotation is +22.4 degrees per g/L. If the known specific rotation is +24.2 degrees per g/L,, what is the % enantiomeric excess of the compound?
- The specific rotation of (R)carvone is -61o. A chemist prepared a mixture of (R)-carvone and (S)-carvone, and the mixture had an observed rotation of -47o. What is the % enantiomeric excess (ee) of the mixture?Trabectedin, shown in a ball-and-stick model on the cover of this text, is an anticancer drug sold under the trade name Yondelis. a. Locate the stereogenic centers in trabectedin. b.What is the maximum number of stereoisomers possible for trabectedin? c.Draw the enantiomer. d.Draw a diastereomer. e.If the specific rotation of trabectedin is +41.5, what is the [α] of a solution that contains 75% trabectedin and 25% of its enantiomer?f . What is the ee of a solution with [α] = +10.5?The [α] of pure quinine, an antimalarial drug, is −165. a.Calculate the ee of a solution with the following [α] values: −50, −83, and −120. b. For each ee, calculate the percent of each enantiomer present. c.What is [α] for the enantiomer of quinine? d. If a solution contains 80% quinine and 20% of its enantiomer, what is the ee of the solution? e. What is [α] for the solution described in part (d)?
- Suppose a solution of a compound gave a rotation of +160o. How could this rotation be distinguihed from one of -200oand from one of +520o?2. A mixture of two enantiomers has as observed rotation of -18°. The specific rotation of the (-)enantiomers is -27°. Find the % of the two enantiomers in the solution.R S rotation for stereoisomers
- Stereochemistry in biological molecules is often denoted by the D‑ and L‑ convention, instead of the ?‑ and ?‑ configurations determined by the Cahn–Ingold–Prelog methodology. Naturally occurring α‑amino acids are typically in the L‑configuration. The Fischer projection of L‑alanine is shown. L‑alanine Identify which structures are equivalent to the L‑configuration.Determine the configuration of each stereogenic center in the compound below. Highlight the carbon in red if the configuration is R, and in blue if the configuration is S.How to identify a polar group and which one is stronger how to calcute the Specific rotation and how to convert something to the pathlength