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The first catalytic asymmetric method to prepare enantioenriched N,S-acetals using chiral BINOL phosphoric acids is reported. The reaction combines N-acyl imines with thiols to generate products in excellent yield and enantioselectivity. The addition reaction could also be achieved with an exceptional substrate to catalyst (S/C) molar ratio. Electron-rich and electron-deficient aromatic N-acyl imines, as well as a broad range of aliphatic and aromatic thiols, showed excellent reactivity. 相似文献
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A new method to synthesize chiral α-amino phosphine oxides is reported. The reaction combines N-substituted imines and diphenylphosphine oxide and is catalyzed by a chiral magnesium phosphate salt. A wide variety of aliphatic and aromatic aldimines substituted by electron-neutral benzhydryl or dibenzocycloheptene groups were excellent substrates for the addition reaction. The dibenzocycloheptene protected imines afforded improved enantioselectivity in the resulting products. Substituted diphenylphosphine oxide nucleophiles also showed good reactivity. 相似文献
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Tonin C. Aluigi A. Bianchetto Songia M. D'Arrigo C. Mormino M. Vineis C. 《Journal of Thermal Analysis and Calorimetry》2004,77(3):987-996
In the wool textile industry, several processes serve to improve the commercial properties of the fibres such as fineness,
softness, length, strength and lustrous. For example, wool is chemically treated with reductive agents then stretched and
set. This leads to modifications of the original protein structure causing changes in thermal behaviour, dyeing, colouristic
and wet resistance properties. A multidisciplinary approach was used to investigate treated and untreated wools, with the
aim of exploiting the nature of the structural changes. SEM and TEM revealed changes on the cuticle and cortical cell morphology;
structure modification were studied by FT-IR and DSC.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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