Synthesis of Biaryls by Intramolecular Radical Transfer in Phosphinates
摘要:
Phosphinates 20a-35a give biaryls 20b-35b on heating with stannanes in the presence of AIBN. The process involves a radical ipso substitution on the migrating aryl ring.
Hydrogen/Halogen Exchange of Phosphines for the Rapid Formation of Cyclopolyphosphines
作者:Adam N. Barrett、Callum R. Woof、Christopher A. Goult、Danila Gasperini、Mary F. Mahon、Ruth L. Webster
DOI:10.1021/acs.inorgchem.1c02734
日期:2021.11.1
The hydrogen/halogen exchange of phosphines has been exploited to establish a truly useable substrate scope and straightforward methodology for the formation of cyclopolyphosphines. Starting from a single dichlorophosphine, a sacrificial proton “donor phosphine” makes the rapid, mild synthesis of cyclopolyphosphines possible: reactions are complete within 10 min at room temperature. Novel (aryl)cyclopentaphosphines
phosphites 2–4 are readily available from Cl2PR and (R,R)- or (S,S)-α,α,α′,α′-tetraaryl-1,3-dioxolane-4,5-dimethanols (= TADDOLs 1, which, in turn, are only two steps away from tartrate); the X-ray crystal structure of one representative, the phenyl phosphonite 2b, was determined. Five previously described and six new ones of the chiral P derivatives were tested as ligands for RhI- and PdO-catalyzed reactions
METHOD FOR PRODUCING ORGANIC PHOSPHOROUS COMPOUNDS CONTAINING HALOGENE
申请人:Baumann Robert
公开号:US20090281356A1
公开(公告)日:2009-11-12
Method of producing compounds of the general formula
XPR
2
(OR
1
) I a
where X is chlorine, bromine or iodine and R
1
is an organic radical, by reacting compounds of the general formula
X
2
PR
2
II,
in which X has the meaning given above and R
2
is an organic radical, with compounds of the general formula
R
1
OH III,
in which R
1
has the meaning given above, to give a mixture IV, in that
a) the postreaction is carried out at a temperature of from 50 to 240° C. and a pressure of from 0.001 to 0.9 bar,
b) from the mixture IV the compounds I a are separated off from the compounds
PR
2
(OR
1
)
2
I b
and, if appropriate, the compounds II and
c) compounds I b and, if appropriate, unreacted compounds II are returned to the synthesis stage.
The invention relates to a process for synthesizing tertiary phosphines by reacting halophosphines with organomagnesium compounds in the presence of copper compounds and optionally of salts.
Convenient and Scalable Synthesis of Aryldichlorophosphines and Primary Arylphosphines via Perthiophosphonic Anhydrides
作者:Petr Kilian、Daniel Picthall、Brian A. Surgenor
DOI:10.1055/a-1994-2301
日期:2023.3
scalable synthetic route to both primary arylphosphines ArPH2 and aryldichlorophosphines ArPCl2 is reported. The C–P bond formation was performed in a highly regiospecific manner through electrophilicsubstitution of selected aromatic hydrocarbons (ArH) with phosphorus pentasulfide. The resultant perthiophosphonic anhydrides Ar2P2S4 were then reacted with LiAlH4 to give primary phosphines ArPH2. Subsequent
报道了伯芳基膦 ArPH 2和芳基二氯膦ArPCl 2的可扩展合成路线。通过用五硫化二磷对选定的芳烃 (ArH) 进行亲电取代,以高度区域特异性的方式形成 C-P 键。然后将所得的过硫代膦酸酐Ar 2 P 2 S 4与LiAlH 4反应以得到伯膦ArPH 2。随后 ArPH 2与光气溶液反应生成二氯膦 ArPCl 2. 每个反应步骤都需要最少的纯化,并使用市售且经济的前体。反应的范围显示包括烷氧基和苯氧基取代的苯以及萘和芴作为起始原料。