• The discovery of the first crown ether is described. Forty-seven other aromatic and saturated polyethers were synthesized and their properties determined. Many form stable crystalline complexes with alkali and alkaline earth salts. Some saturated crown ethers solubilize potassium hydroxide and permanganate in aromatic hydrocarbons, EThe SC!5 indicates that this paper has been cited in over 1,...

The performance of a fire resistant coating for tunnel passive fire protection under successive severe thermal loading is presented. The material falls under the class of potassium based geopolymers (K-geopolymer) and was prepared by mixing ferronickel (FeNi) slag, doped with pure alumina, with a highly alkaline potassium hydroxide aqueous phase. Its performance was assessed by subjecting a con...

The structures of nanocrystalline pristine, potassium hydroxide and sodium acetate intercalated new two-dimensional materials Ti3C2 MXenes were studied using the x-ray atomic pair distribution function technique. Pristine MXene has a hexagonal structure with a=b=3.0505(5)  Å, c=19.86(2)  Å (S.G. P63/mmc No. 194). Both hydroxyl and fluoride terminating species are present. The intercalation of K...

The title compound, C(22)H(22)N(2), was prepared by the reaction of 4-amino-toluene with sodium carbonate, sodium hydroxide and potassium permanganate. The mol-ecule is disposed about a crystallographic inversion centre with one half-mol-ecule comprising the asymmetric unit. The dihedral angle between the terminal and central benzene rings is 88.05 (1)°. The crystal packing is stabilized by van...

A solution of the compound in 5% methanolic potassium hydroxide remained colorless. Acknowledgment.-The authors are indebted to Mr. J. F. Alicino and his assistants for the microanalyses, and to Dr. Nettie Coy for the ultra-violet absorption data. Summary.-Diacetyl-7-ketojervine has been prepared by chromic acid oxidation of diacetyljervine. The ultra-violet absorption characteristics of this c...

Meta l impregnat ion , or "s ta in ing ," of tissue sections for electron microscopy has become the accepted practice in recent years. Salts of metals of h igh atomic weight such as u ran ium, chromium, thor ium, lead, or tungsten, among many tested, have been found suitable (6, 1). "Lead hydroxide ," as prepar ted by Watson (6), is now widely used, hu t this solution is extremely unstable in a...

Abstract The transesterification reaction of sunflower, mustard and linseed oil with ethyl alcohol was studied using potassium hydroxide as a catalyst. physicochemical properties low-temperature characteristics the feedstock obtained products were studied. most preferred for biodiesel fuel production had been determined.

A novel and non-ODS-based (ODS = ozone-depleting substance) preparation of 2-chloro-2,2-difluoroacetophenone (1) was achieved in high yield by using 2,2,2-trifluoroacetophenone as the starting material. Compound 1 was found to act as a good difluorocarbene reagent, which readily reacts with a variety of structurally diverse phenol derivatives 4 in the presence of potassium hydroxide or potassiu...

The Action of Liquid-Ammonia Solutions of Ammono Acids on Metallic Amides, Imides, and Nitrides. The acid amides and imides, and the metallic derivatives of the acid amides and imides are the acds, bases, and salts respectively of an ammonia system of acids, bases, and salts.1 Guided by the relationships implied in the above statement Franklin and Stafford were able to prepare potassium derivat...