Tri(1-adamantyl)phosphine: Expanding the Boundary of Electron-Releasing Character Available to Organophosphorus Compounds
作者:Liye Chen、Peng Ren、Brad P. Carrow
DOI:10.1021/jacs.6b03215
日期:2016.5.25
We report here the remarkable properties of PAd3, a crystalline air-stable solid accessible through a scalable SN1 reaction. Spectroscopic data reveal that PAd3, benefiting from the polarizability inherent to large hydrocarbyl groups, exhibits unexpected electron releasing character that exceeds other alkylphosphines and falls within a range dominated by N-heterocyclic carbenes. Dramatic effects in
[EN] ALKOXYCARBONYLATION OF VYNIL ESTERS<br/>[FR] ALCOXYCARBONYLATION D'ESTERS VINYLIQUES
申请人:LUCITE INT UK LTD
公开号:WO2005118519A1
公开(公告)日:2005-12-15
A process for the alkoxycarbonylation of a vinyl ester comprising reacting a vinyl ester with carbon monoxide in the presence of an alkanol and a catalyst system. The catalyst system used in the said process is obtainable by combining: a) a metal of Group VIII B or a compound thereof, and b) a bidentate ligand of general formula (I) wherein, R is a covalent bridging group; R1 together with Q2 to which it is attached form an optionally substituted 2-Q2-tricyclo[3.3.1.1 3,7}]decyl group or derivative thereof(2-PA); R2 and R3 independently represent univalent radicals upto 20 atoms or jointly form a bivalent radical of up to 20 atoms; and Q1 and Q2 each independently represent phosphorous, arsenic or antimony. The process is carried out for the production of a 3-hydroxy propanoate ester or acid of formula (II) CH2 (OH)CH2 C(O) OR28. The process may also be carried out for the production of a lactate ester or acid of formula (III).
一种用于烯丙酸酯的烷氧羰基化的方法,包括在存在一种烷醇和一个催化剂体系的情况下,将烯丙酸酯与一氧化碳反应。所述方法中使用的催化剂体系可通过组合以下物质获得:a) VIII B族金属或其化合物,以及b) 一种一般式(I)的双齿配体,其中,R是一个共价桥接基团;R1与其连接的Q2共同形成一个可选择地取代的2-Q2-三环[3.3.1.1 3,7}]癸基团或其衍生物(2-PA);R2和R3独立地代表最多20个原子的一价基团,或共同形成最多20个原子的二价基团;Q1和Q2各自独立地代表磷、砷或锑。该方法用于生产式(II) CH2 (OH)CH2 C(O) OR28的3-羟基丙酸酯或酸。该方法也可用于生产式(III)的乳酸酯或酸。
PROCESS FOR PREPARING ARYL- AND HETEROARYLACETIC ACID DERIVATIVES
申请人:Himmler Thomas
公开号:US20140155632A1
公开(公告)日:2014-06-05
The invention relates to a process for preparing aryl- and heteroarylacetic acids and derivatives thereof by reaction of aryl or heteroaryl halides with malonic diesters in the presence of a palladium catalyst, of one or more bases and optionally of a phase transfer catalyst. This process enables the preparation of a multitude of functionalized aryl- and heteroarylacetic acids and derivatives thereof, especially also the preparation of arylacetic acids with sterically demanding substituents.
Production of novel phosphane ligands and use in catalytical reactions
申请人:——
公开号:US20040068131A1
公开(公告)日:2004-04-08
The invention relates to novel phosphane ligands of formula (Ia) and (Ib): (adamantyl)nP(alkyl)m(1a); (adamantyl)o(Alkyl)qP (alkylen′)P(adamantyl)r(alkyl)s (1b), wherein adamantyl represents an adamantyl radical (IIa, IIb) bonded to the phosphorous atom in position 1 or 2. The invention also relates to the production and use of the above-mentioned ligands in the presence of transitional metal compounds of the 8th. Subgroup of PSE for catalytic reactions, particularly for the refining of halogen aromatics for producing aryl olefins, dienes, diarylene, benzoic acid and acrylic acid derivatives, aryl alkanes and also amines.
di(1-adamantyl)phosphine followed by deprotonation of the resulting phosphonium halide is described. Compared to previous protocols for the synthesis of this class of compounds, the procedure does not require chlorination of the secondary phosphine by phosgene, or formation of sensitive lithium di(1-adamantyl)phosphide. Selected examples of the prepared phosphoniumsalts and phosphines are shown to be