H-膦酸二苯酯在无水反应条件下发生碱促进的歧化成亚磷酸三苯酯和H-膦酸苯酯。根据31 P NMR数据,提出了这种转化的最可能机理。为了证实这些发现并更深入地了解芳基H-膦酸酯的化学性质,我们还进行了一些有关用各种缩合剂活化苯基和二苯基H-膦酸酯的研究。我们发现,膦酸的芳基对烷基酯通常在活化过程中遵循不同的反应途径,这很可能可以追溯到磷中心的较高亲电性和芳基H-膦酸酯衍生物中PH键的较高反应性。
[EN] METAL-FREE DIRECT ARYLATION OF DIALKYL PHOSPHONATES FOR THE SYNTHESIS OF MIXED ALKYL ARYL PHOSPHONATES<br/>[FR] ARYLATION DIRECTE SANS MÉTAL DE PHOSPHONATES DE DIALKYLE POUR LA SYNTHÈSE DE PHOSPHONATES D'ARYLE ALKYLE MIXTES
申请人:THE BOARD OF REGENTS OF THE NEVADA SYSTEM OF HIGHER EDUCATION ON BEHALF OF THE UNIV OF NEVADA LAS VE
公开号:WO2019028391A1
公开(公告)日:2019-02-07
Provided herein are phosphates, thiophosphates, phosphonates, and phosphinates, methods of making same, and methods of using these compounds and methods for the generation of pharmaceutically relevant phosphate, phosphonate, and phosphinate analogs. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
A kinetic study of competing fragmentation and hydrolyses of phenyl hydrogen α-hydroxyiminobenzylphosphonate—a case of acid mediated inhibition of acid catalysis
metaphosphate intermediate. 2) Compound (E)-2 was found to undergo hydrolytic cleavage of the oxime group giving NH2OH and hydrogen phenyl benzoylphosphonate (4), which was found to hydrolyze to phenol and benzoylphosphonic acid (5). The latter reacted with the NH2OH liberated in the previous step to give α-hydroxyiminobenzylphosphonic acid ((E)-3), which fragmented to benzonitrile and phosphoric acid. The
The substituent effect on the geometrical selectivity in the Horner–Wadsworth–Emmons (HWE) reaction was studied employing several mixed phosphonoacetates. Their reactions with aromaticaldehydes showed a gradual change in Z-selectivity according to the electron-withdrawing ability of the phosphonate substituents, and there was a good correlation between the observed selectivities and 31P chemical shifts
作者:I.Darren Grice、Peta J. Harvey、Ian D. Jenkins、Michael J. Gallagher、Millagahamada G. Ranasinghe
DOI:10.1016/0040-4039(95)02282-1
日期:1996.2
Treatment of a dialkyl phosphite with triphenylphosphine and diisopropyl azodicarboxylate in toluene, followed by addition of an alcohol, results in the formation of the corresponding trialkyl phosphite. Similarly, dialkyl phosphonites can be synthesised from monoalkyl phosphites (alkyl phosphinates).
Selective Hydrogenation Catalyst and Methods of Making and Using Same
申请人:Cheung Tin-Tack Peter
公开号:US20100228065A1
公开(公告)日:2010-09-09
A composition comprising a supported hydrogenation catalyst comprising palladium and an organophosphorous compound, the supported hydrogenation catalyst being capable of selectively hydrogenating highly unsaturated hydrocarbons to unsaturated hydrocarbons. A method of making a selective hydrogenation catalyst comprising contacting a support with a palladium-containing compound to form a palladium supported composition, contacting the palladium supported composition with an organophosphorus compound to form a catalyst precursor, and reducing the catalyst precursor to form the catalyst. A method of selectively hydrogenating highly unsaturated hydrocarbons to an unsaturated hydrocarbon enriched composition comprising contacting a supported catalyst comprising palladium and an organophosphorous compound with a feed comprising highly unsaturated hydrocarbon under conditions suitable for hydrogenating at least a portion of the highly unsaturated hydrocarbon feed to form the unsaturated hydrocarbon enriched composition.