Timeline for Is specific rotation defined for mixtures of enantiomers or meso compounds?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Dec 18, 2019 at 8:36 | answer | added | Jan | timeline score: 3 | |
| Dec 18, 2019 at 4:24 | comment | added | ACR | My apologies, but I don't trust Wikipedia as a scientist especially when there is no authentic reference in that section. As you know it is open to editing by everyone. A polarimeter cannot measure above 180, if I remember correctly, but molar optical rotation can be large, but that is a calculated number. An interesting question is how to observe a >360 degree rotation experimentally? | |
| Dec 18, 2019 at 3:28 | comment | added | user55119 | @M.Farooq: Read this: Large and small rotations. en.wikipedia.org/wiki/Specific_rotation | |
| Dec 18, 2019 at 3:15 | comment | added | ACR | @user55119, My gut feeling that 360 degree is theoretically impossible. | |
| Dec 18, 2019 at 3:06 | comment | added | user55119 | @M. Farooq: In part it is a philosophical issue. Observed rotation depends on concentration. I was not referring to specific rotation. | |
| Dec 18, 2019 at 1:27 | comment | added | ACR | @user55119, Is there any real example of 360 degree rotation due to a mixture? Never heard of it. | |
| Dec 17, 2019 at 22:52 | comment | added | user55119 | An observed rotation of zero degrees does not necessarily mean a racemate, meso or achiral compound. If zero is obtained, the sample should be diluted and the rotation repeated to assure that the original reading was not a multiple of 360 (0) degrees. | |
| Dec 17, 2019 at 21:28 | comment | added | Tyberius♦ | If you knew for certain that you only had a mixture of two enantiomers in a solution, but didn't know the relative concentrations, you could use OR to determine them. The specific rotation for a meso compound would be zero, so it does have meaning, at least in the sense that it tells you the compound is not optically active. | |
| Dec 17, 2019 at 21:18 | comment | added | S R Maiti | It would help if you could please put references when you answer, because my confusion is about the definition itself. | |
| Dec 17, 2019 at 21:16 | history | asked | S R Maiti | CC BY-SA 4.0 |