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Potassium forms a blue solution in tetrahydrofoliate which is used for the ? -monoalkylation of -lactones in the presence of 18-crown-6. It is used for generation of potassium ethoxide in solution, for use in the Birch reduction of an aromatic ring, for preparation of potassium amide,
Georgios Sakellariou.; Apostolos Avgeropoulos.; Nikos Hadjichristidis.; Jimmy W. Maysa.; Durairaj Baskarana. Functionalized organic nanoparticles from core-crosslinked poly(4-vinylbenzocyclobutene-b-butadiene) diblock copolymer micelles. Polymer. 2009, 50 (26), 6202-6211.
Colloidal potassium can be obtained by sonication in toluene or xylene under argon at 10 o : Tetrahedron Lett., 25, 753 (1984).
In the presence of 18-crown-6, potassium forms a blue solution in THF, which has been used, e.g. for the ɑ -monoalkylation of -lactones: J. Org. Chem., 52, 4601 (1987); the cleavage of ß -lactones: J. Chem. Soc., Chem. Commun., 1261 (1988); and of aryl ethers and esters: J. Org. Chem., 53, 5230 (1988).
For generation of potassium ethoxide in solution, see: Org. Synth. Coll ., 7, 149 (1990).
For use in the Birch reduction of an aromatic ring, see: Org. Synth. Coll., 9, 698 (1998); reviews of the Birch reduction: Tetrahedron, 45, 1579 (1989); Org. React., 42, 1 (1992).
For preparation of potassium amide, see: Org. Synth. Coll., 8, 173 (1993).
Dichiarazioni di rischio (UE): H260-H314-H318
In contact with water releases flammable gases which may ignite spontaneously. Causes severe skin burns and eye damage. Causes serious eye damage.
Dichiarazioni precauzionali: P223-P231+P232-P303+P361+P353-P305+P351+P338-P405-P501a
Keep away from any possible contact with water, because of violent reaction and possible flash fire. Handle under inert gas. Protect from moisture. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.