and R4 has the meaning defined above, in the presence of a base, preferably a base of an alkali metal, like sodium hydride, sodium or potassium alcoholate, like sodium or potassium methoxide or ethoxide, sodium or potassium hydroxide, or the like, in a solvent like diethyleneglycol dimethyl...
There are disclosed a blue light-emitting polymer and a light-emitting diode adopting the same. A conjugated polymer having phenylene residues substituted by a silicon-containing group in a main chain
Sulphur dioxide (SO2) This can be tested from an air sample by bubbling it through acidified potassium dichromate solution, and the colour of the solution will change from orange to dark green. (This is because sulphur dioxide is a reducing agent.) 3SO2 (aq) + Cr2O72- (aq) + 2H+(...
3.Potassium Metabisulfite - 150gr Solution 2 1.Water(cool) - 300ml。2Sodium Hydroxide- 100gr Solution 3 1.Water - 50ml 2.Potassium Bromide - 5,0gr。3Sodium Benzyl sulfonate - 0.2gr Preparation: Solution 2 is slowly added, in a thin stream to sol.1,while stirring continuously At .....
The obtained compound VII is then treated with benzylic bromides in the presence of potassium carbonate to afford compounds of type IV which are then dissolved in THF and treated with sodium hydride and an electrophile of formula V to give compounds of formula I. Alternatively, in accordance ...
The compounds also form metal salts, examples of which are the alkaline earth and alkali metal salts, e.g. the sodium and potassium salts. The salts are preparable by conventional techniques. For assessment of effects of the compounds on atrial refractoriness, guinea pig right hemiatria are ...
a white precipitate is formed, filter the solution. Add successively 0.1 mL of iodine and potassium iodide TS 3 and 0.1 mL of ammonia TS 2 to the solution. If no blue color is observed, heat carefully to boiling. In the presence of acetates, a dark color develops or a blue precipitate...
potassiumbromidedispersionoftheHNNNHNHNOH2NONHOO-HOO-CH3HCa2+6αsamplecorrespondstothatofaL-5-MTHF-Castandard(seeAppendix).CalciumDilute30gofaceticacid(glacial)to100mlwithwater.Dissolve5.3gofK<#004699'>4Fe(CN)6in100mlofwater.To5mloftheaceticacidsolution,add20mgofthesampleandthen0.5mlofthepotassium...
, the carboxyl group is preferably free or in the form of a metal salt thereof, which metal ion does not react adversely with the cell or enzyme. Preferably the metal ion is derived from a metal in Group IA of the Periodic Table of Elements and more preferably is sodium or potassium....
The obtained compound VII is then treated with benzylic bromides in the presence of potassium carbonate to afford compounds of type IV which are then dissolved in THF and treated with sodium hydride and an electrophile of formula V to give compounds of formula I. Alternatively, in accordance ...