Сообщение
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Bibliographic Information
Cyclic phosphates with substitution or with conjoined or fused rings. Glonek, Thomas; Van Wazer, John R.; Kleps, Robert A.; Myers, Terrell C. Res. Resour. Cent., Univ. Illinois, Chicago, IL, USA. Inorganic Chemistry (1974), 13(10), 2337-45. CODEN: INOCAJ ISSN: 0020-1669. Journal written in English. CAN 81:130229 AN 1974:530229 CAPLUS
Abstract
Conditions are reported for optimization of yields of the 9 detectable products from H3PO4 by carbodiimide-mediated condensations. From the NMR patterns and their mathematical simulation, the following mol. ions or mols. are indicated to be the reaction products from these condensations: the bicyclic rings I and II; oxo-bridged monoanhydrides formed from 2 trimetaphosphate rings, 2 tetrametaphosphate rings, and 1 triand 1 tetrametaphosphate ring; N-P bond-contg. mono-, di-, and trianhydrides of trimetaphosphate with urea derivs.; and monoanhydrides from R2P(O.fwdharw.(OH) and trimetaphosphate, where R = N[CH(CH3)2] [C(O)NHCH(CH3)2] for condensation with diisopropylcarbodiimide and is the analogous urea deriv. for other carbodiimides. Hydrolysis of the condensation product mixts. gave the compds. RPo2-)-O-P(O2-)-O-P(O2-)R, RP(O2-)-O-P(O2-)-O-P(O32-), and RP(O2-)-O-P (O32-) in addn. to some of the usual inorg. chain and ring phosphates. The products obtained by condensation of the tri-and tetrametaphosphoric acids are also discussed.
Bibliographic Information
Carbodiimide-mediated esterifications and condensations of phosphoric acids dissolved in various alcohols. Glonek, Thomas; Van Wazer, John R.; Myers, Terrell C. Res. Resour. Cent., Univ. Illinois, Chicago, IL, USA. Phosphorus and Sulfur and the Related Elements (1977), 3(2), 137-50. CODEN: PREEDF ISSN: 0308-664X. Journal written in English. CAN 88:145408 AN 1978:145408 CAPLUS
Abstract
Carbodiimide-mediated phosphorylations carried out with ortho-, pyro-, trimeta-, tetrameta-, and long-chain polyphosphoric acids dissolved in various alcs., with and without an excess of Bu3N, at 27 consist of complicated reaction sequences involving various phosphoric acids, then esters, and complexes formed between the carbodiimide and these acids or esters. In the case of the condensation of orthophosphoric acid, the process of stepwise esterification competes with the process of condensation to form condensed phosphoric acids and their esters. In general, esterification as opposed to condensation is promoted by increased acidity, smaller size, and increased concn. of the alc., as well as by increased concn. of dissociable protons in the soln. 31P chem.-shift data are given for ortho, chain, and ring phosphoric acids and their esters dissolved in the corresponding alc. Typical kinetic curves and the distribution of products obtained upon the cessation of condensation are also presented.