Phosphites Phosphites - Organophosphites, Phosphorous Acid, Phosphite Ester, Trimethorganophosphites, Phosphorous Acid, Phosphite Ester, Trimethylolpropane Phosphite, Disodium Hydrogen Phosphite Ylolpropane Phosphite, Disodium Hydrogen Phosphite (Paperback)

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Organophosphites, Phosphorous Acid, Phosphite Ester, Trimethylolpropane Phosphite, Disodium Hydrogen Phosphite, Monopotassium Phosphite. Excerpt: 73.6 C, 347 K, 164 F Phosphorous acid is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is as an intermediate in the preparation of other phosphorus compounds. H3PO3 is more clearly described with the structural formula HPO(OH)2. This species exists in equilibrium with a minor tautomer P(OH)3. IUPAC recommendations, 2005, are that the latter is called phosphorous acid, whereas the dihydroxy form is called phosphonic acid. Only the reduced phosphorus compounds are spelled with an "ous" ending. Other important oxyacids of phosphorus being phosphoric acid (H3PO4) and hypophosphorous acid (H3PO2). The reduced phosphorus acids are subject to similar tautomerism involving shifts of H between O and P. The P(OH)3 tautomer can been observed as a ligand bonded to molybdenum. In the solid state, HP(O)(OH)2 is tetrahedral with one shorter P=O bond of 148 pm and two longer P-O(H) bonds of 154 pm. Because the electronegativity of H and P are similar, the covalent P-H bond does not alter oxidation state of phosphorus, which is assigned the formal oxidation state P(II). HPO(OH)2 is the product of the hydrolysis of its acid anhydride: P4O6 + 6 H2O 4 HPO(OH)2(An analogous relationship connects H3PO4 and P4O10). On an industrial scale, the acid is prepared by hydrolysis of phosphorus trichloride with water or steam: PCl3 + 3 H2O HPO(OH)2 + 3 HClPotassium phosphite is also a convenient precursor to phosphorous acid: K2HPO3 + 2 HCl 2 KCl + H3PO3In practice aqueous potassium phosphite is treated wi... More: http://booksllc.net/?id=1966205