Protonation and alkylation of organophosphorus compounds with trifluoromethanesulfonic acid derivatives
作者:L. L. Tolstikova、A. V. Bel’skikh、B. A. Shainyan
DOI:10.1134/s1070363211030054
日期:2011.3
Protonation (alkylation) of triphenylphosphine, triethylphosphite, triphenylphosphine oxide, triethylphosphate, hexamethylphosporamide, and dimethylphosphite with trifluoromethanesulfonicacid, its bisimide, and methyl ester was studied and the corresponding 1H, 13C, 19F, 31P NMR spectra were analyzed.
Heating of dialkylacylphosphonates with sulphonic acids under anhydrous conditions leads to the formation of alkylsulphonates an alkylcarboxylates. 31P N.m.r. spectroscopy revealed that the reaction of equimolar amounts of dimethyl benzoylphosphonate (1) and toluene-p-sulphonic acid at room temperature gives dimethyl phosphonate (6) in 50% yield. It is proposed that the by-product of this reaction
在无水条件下将二烷基酰基膦酸酯与磺酸一起加热导致形成烷基磺酸酯和烷基羧酸酯。31 P Nmr光谱显示,等摩尔量的苯甲酰基膦酸二甲酯(1)与甲苯-对-磺酸在室温下反应,生成膦酸二甲酯(6),产率为50%。建议该反应的副产物苯甲酸甲苯-对-磺酸酐(8)与过量的甲苯-对-磺酸酐反应,得到甲苯-对-磺酸酐(9)。)和苯甲酸。已显示这两种化合物与膦酸二甲酯一起加热分别产生甲苯-对-磺酸甲酯和苯甲酸甲酯。这些反应的假定副产物是亚磷酸(HPO 2)。通过对二甲基苯甲酰基膦酸酯及其质子化产物进行的MNDO / H方法进行的量子力学计算表明,二甲基苯甲酰基膦酸酯的质子化的首选位置是P O氧,在该位置的质子化之后是C–P键断裂,零活化能,生成亚磷酸二甲酯和苯甲酰阳离子。
Reconsideration of the Base-Free Batch-Wise Esterification of Phosphorus Trichloride with Alcohols
作者:H. Fakhraian、A. Mirzaei
DOI:10.1021/op049958v
日期:2004.5.1
Batch-wise esterification of phosphorus trichloride with different alcohols in the absence of base and cleavage of the reaction products by the HCl released in course of the reaction were reinvestigated. The role of the kind of alcohol, mixing order of reagents, temperature, time of reaction, and excursion of gaseous HCl in the proportional composition of the reaction products were studied. Considering
The formation of dimethyl amino(pyrene-1-yl)methylphosphonates in the Kabachnik-Fields reaction with dibenzyl phosphite, pyrene-1-carboxaldehyde and a non-aromatic amine in methanol
作者:Jarosław Lewkowski、Maria Rodriguez Moya
DOI:10.1080/10426507.2017.1308932
日期:2017.6.3
GRAPHICAL ABSTRACT ABSTRACT The Kabachnik-Fields reaction of pyrene-1-carboxaldehyde with dibenzyl phosphite and aliphatic amines in methanol led to the formation of dimethyl amino(pyren-1-yl)methyl-phosphonates, in some cases accompanied by dimethyl hydroxy(pyren-1-yl)methyl-phosphonate. These results are exclusive for the above compounds, in all other studied cases (aromatic aldehydes, aromatic amines)
A novel and convenient method for synthesizing unsymmetrical N-benzyloxycarbonyl-protected 1-amino-1-arylalkylphosphonate mixed diesters
作者:Jiaxi Xu、Nanyan Fu
DOI:10.1039/b008340m
日期:——
Unsymmetrical N-benzyloxycarbonyl-protected 1-amino-1-arylalkylphosphonate mixed diesters were synthesized using a one-pot reaction involving benzyl carbamate, aromatic aldehydes and alkoxydichlorophosphine, followed by treatment with alcohols in the presence of triethylamine. The reactions were followed by 31P NMR and a mechanism is proposed.