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crimsonpetal

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About crimsonpetal

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    chemistry
  1. This reactions is one of variations of Claisen Rearrangement, called Eschenmoser–Claisen rearrangement. The Eschenmoser–Claisen rearrangement proceeds from an allylic alcohol to a γ,δ-unsaturated amide, and was developed by Albert Eschenmoser in 1964 You can see the mechanism at http://en.wikipedia.org/wiki/Claisen_rearrangement
  2. okay, I find the explanation finally. Since magnesium halides are moderate Lewis acids,their presence in solution may influence the outcome of certain chemical reactions. Magnesium bromide rearranges the epoxide to cyclopentanecarbaldehyde, which then adds the Grignard reagent in the expected manner like your drawing. dialkylmagnesium reagents and organolithium reagents simply adds to the epoxide by opening the strained ring, they are more selective. For the mechanism of the rearrangement, I am not sure, I think it may like the pinacco rearrangement.
  3. VŒš Microsoft Word •¶žƒ.dochello, today I went over a ppt about organometallic compounds and I found I can't figure out why this equation could happen, can someone help me ?
  4. It's all related to solubility, and remember the impurities are little compared to the main product. The insoluble impurity can removed by filtration. The When you recrystallize, you heat the solvent to increase solubility and use the minimum hot solvent to dissolve your product, after cooling you get your product, the soluble impurity is so little that it can solube in the minimum solvent after cooling.
  5. how can two polymer (the main composition of super glue and cotton) so ready to react ? Or because other minors?
  6. May be it is a highly symmetrical structure, with one quaternary carbon at the center and four branches each have 8 -CH2 and 1 -COOH. Just guess~~
  7. I recommend this site, http://www.orgsyn.org/ , when you want to find reliable method to synthesis some substance.
  8. does anyone has the experience of handling isonitrile, will this kind of compound stable under column chromatography and roatary evaporation conditions?
  9. Thanks, my boss recently received an email to invite him to write articles for COC, and my boss want to give the work to me, so.
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