Magnesium bromide Ether

Glycosyl sulfones, normally of low reactivity, have been reported as glycosyl donors, activated by magnesium bromide etherate.188... 

In the presence of magnesium bromide etherate, yields of the a-allylpyrrolidines could be considerably improved. If instead of the quinazolinone aziridine the phthalimido aziri-dine was selected, the reaction proceeded better in the absence of magnesium bromide. 

Cyclopentanecarboxaldehyde has been prepared by the procedure described above 2 3 by the reaction of aqueous nitric acid and mercuric nitrate with cyclohexene 6 by the action of magnesium bromide etherate 6 or thoria 7 on cyclohexene oxide by the dehydration of frarei-l, 2-cyclohexanediol over alumina mixed with glass helices 8 by the dehydration of divinyl glycol over alumina followed by reduction 9 by the reaction of cyclopentene with a solution of [HFe(CO)4] under a carbon monoxide atmosphere 10 and by the reaction of cyclopentadiene with dicobalt octacarbonyl under a hydrogen and carbon monoxide atmosphere.11... 

What is the purpose of the magnesium bromide etherate in step d ... 

Rationalise the stereochemistry of the nucleophilic attack on compound 4 in step e. What role does the magnesium bromide etherate play in the stereocontrol ... 

Magnesium bromide etherate Magnesium, dibromo(ethyl ether) (8) Magnesium, dibromo[1,1 -oxybis[ethane]]- (9) (29858-07-9)... 

Magnesium bromide etherate, 288 Magnesium hydride, 146 Magnesium iodide, 60 Maleic anhydride, 18 Malonic esters, 59 Manganese(ll) chloride, 288-289 Manganese dioxide, 132, 133, 151... 

Enholm [26] has reported the first examples of asymmetric radical cy-clizations on soluble polymer supports. The stereocontrol element employed consists of a (+)-isosorbide group attached by a 4-carbon chain to each subunit of a soluble succinimide-derived ROMP backbone. Treatment of the radical cychzation substrate 162 with tributyltin hydride in the presence of zinc chloride followed by hydrolysis of the resulting polymer-supported ester 163 gave the desired product 164 in 80% yield and > 90% ee (Scheme 38). The use of alternative Lewis acids, such as magnesium bromide etherate and ytterbiiun (III) triflate, resulted in lower enantioselectivities, 84% and 72% respectively. No such decrease in selectivity was observed in analogous reactions carried out off-support [27], suggesting that the polymer backbone is somehow responsible for this phenomenon. 

Isomerization Diisobutylaluminum hydride. Magnesium bromide etherate. Methylation Dimethylmagnesium. 

Isomerization, see also NaphthaIene-2,6-dicarboxylic acid, preparation Aldqximes — Amides Nickel acetate tetrahydrate. Dienes Phenylpotassium. Epoxides Lithium diethylamide. Magnesium bromide etherate. Nonconjuoateo enones p-Tolu iesulfonic acid. Olefins (cis-trans)-. Iodine. Selenium. Olefins (bond migration) N-Lithioethylenediamine. Lithium diethylamide. Potassium l-butoxide. Sodium tetrafluoroboric s d. Thioglycolic acid. Polyenes Sulfur dioxide. 

Magnesium bromide etherate, 2.58 g, 10 mmol Dichloro[1,3-bis(diphenylphosphino)propane] nickel(ll), 0.026 g, 0.05 mmol... 

A dry three-necked flask (250 ml) is equipped with a condenser, a septum cap, a solid sample addition tube, and a Teflon -coated magnetic stirrer. The addition tube is then charged with magnesium bromide etherate (2.58 g, 10 mmol). The condenser is then connected to the double manifold via a gas adapter and the flask is evacuated and then purged with argon. 

Unstable metalated thiazoles can be generated in situ from 2-lithiothiazole (219) by trans-metalation with an appropriate reagent. The cuprate is obtained by the use of a suspension of copper(I) bromide in THF <87JOM(332)95> the magnesium bromide and ethylaluminum chloride are obtained by the use of magnesium bromide etherate or diethylaluminum chloride, respectively... 

Magnesium bromide, anhydrous, MgBr2 [1,629, before Magnesium bromide etherate]. Mol. wt. 184.15. Supplier A. D. MacKay, Inc. 

Further oxidation of 1-thioglycosides leads to glycosyl sulfones. These have been reported to be activable by magnesium bromide etherate in the presence of sodium hydrogencarbonate.167... 

We could not accomplish this conversion with 3-bromothiophene. However, addition of magnesium bromide etherate to a solution of 3-lithiothiophene gives the 3-bromo-Grignard quantitatively [145] ... 

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