865-33-8Relevant articles and documents
Evaluating Electron Transfer Reactivity of Rare-Earth Metal(II) Complexes Using EPR Spectroscopy
Moehring, Samuel A.,Evans, William J.
, p. 1187 - 1194 (2020)
To evaluate the relative reducing capacities of rare-earth metal complexes of Sc(II), Y(II), and complexes of the lanthanide metals in their +2 oxidation state, a series of reactions of trivalent LnIIIA3 compounds with divalent [Ln′IIA′3]1- complexes has been examined, where Ln = Sc, Y, or a lanthanide and A is C5H4SiMe3 (Cp′), C5H3(SiMe3)2 (Cp″), C5Me4H (Cptet), N(SiMe3)2 (NR2), 2,6-tBu2-C6H3O (OAr), or 2,6-tBu2-4-Me-C6H2O (OAr′). The specific combinations were chosen to allow evaluation by EPR spectroscopy of the Ln(II) complex. The [LnIICp′3]1- complexes of Y(II), La(II), and Lu(II) have similar reducing abilities in that they all reduce LnIIICp′3 complexes of the other metals in this group. However, these Y(II), La(II), and Lu(II) complexes all are stronger reductants than [GdIICp′3]1-, which cannot reduce LnIIICp′3 complexes of Y, La, and Lu. These results do not apply to all ligand sets, since [GdII(NR2)3]1- can reduce YIII(NR2)3 to [YII(NR2)3]1-. The amide and aryloxide complexes of Y and Sc are similar in that [YII(NR2)3]1- reduces ScIII(NR2)3 and [YII(OAr′)3]1- reduces ScIII(OAr′)3. Both [YII(NR2)3]1- and [YII(OAr′)3]1- reduce YIIICp′3. [LaIICptet3]1- has reductive capacity similar to that of [LaIICp′3]1-, and both are stronger reductants than [LaIICp″3]1-. None of the LnIII2 complexes of Sm, Tm, Dy, and Nd can reduce LnIIIA3 complexes of Y and La to [LnIIA3]1-. In the same-metal-different-ligands reactions, multiple EPR signals are found, suggesting that ligand exchange occurs alongside the electron transfer reactivity.
METHOD FOR PRODUCING POLYALKYLENE GLYCOL DERIVATIVE HAVING AMINO GROUP AT END
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Paragraph 0162-0164; 0232, (2016/07/05)
A method simply produces a narrowly distributed and high-purity polyalkylene glycol derivative having an amino group at an end without using a heavy metal catalyst. A method for producing a polyalkylene glycol derivative having an amino group at the end by reacting a compound represented by the general formula (V) with an alkylene oxide, then reacting a reaction product with an electrophile represented by the general formula (I), and deprotecting the obtained product without using a heavy metal: [in-line-formulae]RA3O(RA4O)k-1RA4O?M+??(V)[/in-line-formulae]wherein RA3 represents a linear; branched, or cyclic hydrocarbon group having 1 to 20 carbon atoms; RA4 represents an alkylene group having 2 to 8 carbon atoms; k represents an integer of 2 to 5; and M represents an alkali metal; wherein RA1a and RA1b each independently represent a protective group of the amino group, or one of RA1a and RA1b represents H and the other represents a protective group of the amino group, or RA1a and RA1b bind to each other to form a cyclic protective group, and the protective group is deprotectable without using a heavy metal; RA2 represents a linear, branched, or cyclic hydrocarbon group having 1 to 6 carbon atoms; and X represents a leaving group.
Process for preparation of dicarboxylic acid monoesters
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, (2008/06/13)
A process for producing a dicarboxylic acid monoester which comprises subjecting a dicarboxylic acid monoester or an alkali metal salt of a dicarboxylic acid monoester and a metal alkoxide to transesterification in the presence of an organic solvent, or a process for producing a dicarboxylic acid monoester which comprises subjecting a dicarboxylic acid monoester or an alkali metal salt of a dicarboxylic acid monoester and an alcohol to transesterification in the presence of a metal alkoxide.
