5 jul. 1- Dados os compostos de Grignard abaixo, forneça a nomenclatura de cada um deles: a) H3C — CH2— CH2— CH2— MgCl Cloreto de butil-. Keywords: allylic oxidation, selenium dioxide, homoallylic alcohols, Grignard adsorvido em SiO2, propicia uma rota conveniente para tais compostos. O primeiro estudo sistemático sobre os compostos organoestânicos (OTs, .. tetrassubstituído via reação de “Grignard” (brometo ou cloreto de etil, butil ou.
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To a stirred solution of 14 3. Kascheres on occasion of his 60 th birthday. The organic layer was then dried over MgSO 4filtered and the solvent was removed under reduced pressure.
C -geranyl and C -farnesyl griggnard have been prepared by reaction of geranyl or farnesyl bromide with the sodium salt of the phenol. Economic Entomology79 To improve the low yield that was obtained for the oxidation of 8we investigated a new route to reach 9. The same procedure as employed for the oxidation of 1 was used, starting with 7 3.
To a two-necked mL round bottom flask with 2-iodophenyl tetrahydropyranyl ether 6 3. The ether phase was washed with water grinard mLthen with brine 2×30 mLdried over MgSO 4filtered and the solvent was removed under reduced pressure by rotatory evaporation. Alkylation of sodium salts, however, invariably leads to complex mixtures containing both ring and oxygen substituted products. Geraniol girgnard purchased from Aldrich Chem.
Acta, Then a solution of 2 E – 3,7-dimethyl-2,6-octadienyl grignxrd H pyranyl ether 12 The solvent was removed under vacuum and the residue was diluted in ether 50 mL and water 30 mLthen extracted with ether 2×30 mLdried over MgSO 4 and filtered, and then the solvent was removed under reduced pressure. The mixture was treated drop wise with cold metanol 1 mL and extracted with hexane. Further studies on phenolic oxidation of these synthetic intermediates to achieve the synthesis of cyclic isoprenoids will be reported in due course.
February 4, Published on the web: The Sharpless conditions for oxidation of geranyl acetate employs 0. The mixture was stirred for 48 h. A wide variety of phenolic natural products contain isoprenoid residues.
To a solution of 10 3. Services on Demand Journal. The reaction was cooled, a saturated solution of NH 4 Cl was added, the solutions was extracted with ether 3×50 mL grrignard, dried over MgSO 4filtered and the solvent was removed under reduced pressure by rotatory evaporation.
Em Organotin Compounds ; Sawyer, A. How to cite this article. Geranyl bromide 4 was necessary in the next steps and its preparation although it is commercially available was achieved after some attempts in order to optimize the conditions for getting high yield.
Then BuLi in hexane 2. After stirring for 15 min at room temperature, cold pentane 25 mL was added, and the organic layer was washed with cold water, extracted with pentane 2×25 mL and then washed with brine.
Conclusion In brief, we optimized a selective oxidation of allylic methyl groups in geraniol derivatives over a solid support to the corresponding trans- ab -unsaturated alcohols and aldehydes, using selenium dioxide and t -butylhydroperoxide adsorbed on silica gel as oxidants. To a solution of 2-iodophenol 2. However, “nontarget” organisms may be exposed, resulting in the poisoning of biological system, originating mutations and sentencing species to extinction.
After allowing the reaction mixture to reach ambient temperature, CuI was added followed by the addition of allylic alcohol 2.
In ed, we optimized a selective oxidation of allylic methyl groups in geraniol derivatives over a solid support to the corresponding trans- ab -unsaturated alcohols and aldehydes, using selenium dioxide and t -butylhydroperoxide adsorbed on silica gel as oxidants. The extracts were washed with a saturated aqueous solution of FeSO 4.
After the temperature grignafd room temperature, CuI 1. Environmental contamination for organotin compounds. Also, we developed an efficient synthesis of 2-geranylphenol derivatives via a Cu I -mediated Grignard coupling of 2-lithiophenols and geranyl substrates. Some OTs are used as pesticides in crops, or as biocides in antifouling paints, applied in the ship hulls to avoid attachment and growth of tube worms, mussels and barnacles.
The organic layer was washed with two portions of brine then dried with anhydrous MgSO 4. The extracts were dried over MgSO 4filtered and the solvent was removed under reduced pressure by rotatory evaporation. The same procedure as employed for allylic oxidation of 1 was used ; compound 13 3.
Results and Discussion The Sharpless conditions for oxidation of geranyl acetate employs 0.
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Services on Demand Journal. This result was still not satisfactory so we tried a different approach. Fall30 ,