Download e-book for kindle: Carbohydrates (Best Synthetic Methods) by Helen Osborn

By Helen Osborn

ISBN-10: 0123120853

ISBN-13: 9780123120854

There's a titanic and infrequently bewildering array of artificial tools and reagents to be had to natural chemists this day. The top man made tools sequence permits the practicing artificial chemist to choose from the entire choices and examine their genuine merits and obstacles.

each one bankruptcy during this booklet information a specific topic linked to carbohydrate synthesis. a quick evaluation of the topic zone is equipped, however the emphasis in all situations is on describing effective functional how you can impression the variations defined.

to ensure that the jobs of carbohydrates to be completely analysed and assessed, glycobiologists require entry to outlined objective carbohydrates in beneficial amounts. therefore carbohydrates and glycoconjugates are actually well-known as very important pursuits for overall synthesis programmes and it truly is necessary to improve effective regio- and stereoselective tools for the synthesis of carbohydrates. while carbohydrates can occasionally be remoted from usual resources, man made options frequently provide the good thing about permitting entry to greater amounts of fabric in addition to access to analogues of the usual carbohydrates. * the most recent quantity within the lengthy status top man made equipment sequence * transparent bankruptcy by means of bankruptcy breakdown of carbohydrate synthesis issues with examples of fine useful equipment for universal carbohydrate syntheses.

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Extra resources for Carbohydrates (Best Synthetic Methods)

Sample text

The silver(I) oxide aids dissociation of bromide, enhancing the reactivity of the alkylating agent. Materials. 5 g, 114 mmol) irritant Methanol (10 ml) highly flammable, toxic Celitew harmful by inhalation, possible irreversible effects Hexane (chromatography solvent) highly flammable, harmful Diethyl ether (chromatography solvent) extremely flammable, harmful Equipment. Round bottomed flask (250 ml) with rubber septum and magnetic stirrer bar Source of inert gas Syringes (50 and 20 ml) Magnetic stirrer Cold water bath Column chromatography equipment Procedure.

Alkylation under strongly basic conditions (anionic benzylation). The use of a dipolar aprotic solvent (DMF) enhances the nucleophilicity of the alkoxide by solvating the metal counter-ion. Materials. 0 mmol, 60% dispersion in oil) irritant, harmful, reacts violently with water liberating hydrogen highly flammable, toxic Methanol (10 ml) 34 2. SELECTIVE HYDROXYL PROTECTION AND DEPROTECTION Diethyl ether (100 þ 100 ml) extremely flammable, harmful Distilled water (150 ml) no risk Magnesium sulfate (drying agent) irritant, harmful by inhalation Hexane (chromatography solvent) highly flammable, harmful Ethyl acetate (chromatography solvent) highly flammable, irritant Equipment.

NaOMe, MeOH, rt, 24 h. Notes. Classical Zemple´n acetate deprotection; under these conditions all acetate groups and most other esters are cleaved. 58 2. SELECTIVE HYDROXYL PROTECTION AND DEPROTECTION Materials. 5 M) highly flammable, reacts violently with water, corrosive Amberlite IR 120 (Hþ) resin irritant Equipment. Round bottomed flask (50 ml) with rubber septum and magnetic stirrer bar Source of inert gas Syringes (10 ml, 20 ml and 200 ml) Magnetic stirrer Procedure. 80 mmol) in anhydrous dichloromethane (10 ml) and methanol (20 ml) at room temperature for 20 min.

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Carbohydrates (Best Synthetic Methods) by Helen Osborn

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