Potassium
DiHydrogen Phosphate###NaH2PO4.3H2O 0.230g
As per our interest to develop better protocols for the synthesis of biologically active heterocyclic molecules, we would like to report the synthesis of a series of new 3,4-dihydro-3-substituted-2H-naphtho[2,1-e][1,3] oxazine derivatives using 2 naphthol, formalin and various anilines as substrates in presence of Potassium
Dihydrogen Phosphate catalyst.
In 2002, radio hosts in Kansas City created panic among listeners by reporting that local tap water contained high levels of
dihydrogen monoxide.
1 Fears flow over
dihydrogen monoxide -- aka "water"
You might counter the "why not" with: Because those frozen potatoes have additives such as disodium
dihydrogen (sodium acid) pyrophosphate.
Cisa, made in European Union), Dichloromethane HPLC grade (M.W 84.93, Assay 99.8%, Koch-Light Ltd., England), Methanol HPLC/Spectro Grade (M.W 32.0, Assay 99.9%, MP Biomedicals, LLC, France), Acetonitrile HPLC/Spectro Grade (M.W 41.1, Assay 99.9%, MP Biomedicals, LLC, France), Potassium
dihydrogen phosphate (98100.5%, Riedel de haen, RdH Laborchemikalion GmbH & Co.), HPLC grade Water, Distilled water
Sodium
dihydrogen phosphate, hydrochloric acid, and sodium hydroxide were of analytical grade and obtained from Beijing Chemical Factory (Beijing, China); acetonitrile was HPLC-grade and obtained from Fisher (Leicestershire, UK).
Phosphate salts, such as ammonium
dihydrogen phosphate (N[H.sub.4][H.sub.2]P[O.sub.4]), potassium
dihydrogen phosphate (K[H.sub.2]P[O.sub.4]), and sodium
dihydrogen phosphate (Na[H.sub.2]P[O.sub.4]), were usually used to prepare MPC [10, 11].
Potassium
dihydrogen phosphate (K[H.sub.2]P[O.sub.4], [greater than or equal to]0.995 mass fraction) and potassium nitrate (KN[O.sub.3], [greater than or equal to]0.995 mass fraction) are from Tianjin Bodi Chemical Holding Co., Ltd., China.
Potassium
dihydrogen orthophosphate (KH2PO4) analytical, sodium hydroxide (NaOH) analytical, and methanol was purchased from Sigma-Aldrich (Germany).