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Search term:"palladium acetate"

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53 matches found for palladium acetate

Palladium(II) Acetate, Recrystallized

Aldrich ChemFiles 2010, 10.3, 6. Josephine Nakhla, Ph.D. Market Segment Manager Organometallics & Catalysis josephine.nakhla@sial.com It has been demonstrated that in some applications recrystallized palladium(II) acetate (Pd(OAc)2) performs better than typical grades. White and Overman have both in...

Supported/Encapsulated Palladium Catalysts

Aldrich ChemFiles 2007, 7.10, 23. Palladium has become one of the most commonly used metal for cross-coupling transformations. However, the use of homogeneous palladium presents several drawbacks that can be overcome by attaching the desired palladium complex to a functionalized polystyrene resin. A...

EnCat™ & Other Catalysts

Partnering with Reaxa, we offer a variety of transition metal-based encapsulated catalysts for applications in areas such as Suzuki, Stille, and Heck couplings, carbonylations, hydrogenation, hydrogenolysis, and dihydroxylation. Coupling Chemistry Pd(II) EnCat™ Pd(II) EnCat™ covers a versatile range...

White catalyst

Introduction Developed by Professor M. Christina White and co-workers at the University of Illinois–Urbana, the “White catalyst” (684821) has been shown to be an exceptional catalyst for the functionalization of allylic carbon centers. The bis-sulfoxide-Pd(II) catalyst participates in numerous react...

Pd EnCat™ Encapsulated Palladium Catalysts

• • Download PDF • Homogeneous palladium catalysts are widely utilized due to their versatility, reactivity and functional group tolerance. However, using homogeneous catalysts presents some problems including: • Probable palladium contamination of product necessitating additional clean up • Palladi...

Trost Ligands

• • Download PDF • Palladium-catalyzed asymmetric allylic alkylation (AAA) has proven to be an exceptionally powerful method for the efficient construction of stereogenic centers. In sharp contrast to many other catalytic methods, AAA has the ability to form multiple types of bonds (C–C, C–O, C–S, C...

Sonogashira Coupling Catalyzed by Palladium on Polymer Supports

• • Download PDF • Supported palladium catalysts are widely used in the Suzuki, Heck, and Sonogashira cross-coupling reactions. The advantages to using supported catalysts in organic synthesis include reagent stability, suitability for automation, ease of workup, recyclability, and lower Pd contamin...

PEPPSI™ Catalysts in Chemical Synthesis

PEPPSI™-IPr: An air- and water-stable catalysts for industrially useful intermolecular cross-coupling reactions, aminations, and intramolecular Heck transformations. Professor Mike Organ at York University, along with co-workers Dr. Chris O’Brien and Dr. Eric Kantchev, have developed an elegant pall...

DSM MonoPhos™ Family - Aldrich ChemFiles 2008, 8.2, 51.

Aldrich ChemFiles 2008, 8.2, 51. Feringa and co-workers have developed a diverse array of chiral, monodentate phosphoramidites based on the privileged BINOL platform.1 The MonoPhos™ family has exhibited high levels of enantiocontrol in synthetic transformations ranging from metal-catalyzed asymmetri...

An Improved Protocol for the Pd-Catalyzed r-Arylation of Aldehydes with Aryl Halides

A series of palladacyclic precatalysts that incorporate electron-rich di-tert-butylphosphino biaryl ligands is reported. These precatalysts are easily prepared, and their use provides a general means of employing bulky ligands in palladium-catalyzed cross-coupling reactions. The application of these...

Landis Ligands

Aldrich ChemFiles 2008, 8.2, 84. The interest in asymmetric reactions has been growing for the past 40 years. To address the challenges of synthesizing chiral building blocks with high yields and high selectivities, researchers developed a broad range of catalysts. Two of the essential components fo...

Asymmetric Allylic Alkylation - Advantages and Applications in Chemical Synthesis

. Introduction . Advantages . Representative Application . Pd-Catalyzed Asymmetric Allylic Alkylation: Carbon Nucleophiles . Pd-Catalyzed Asymmetric Allylic Alkylation: Oxygen Nucleophiles . Pd-Catalyzed Asymmetric Allylic Alkylation: Nitrogen Nucleophiles . Pd-Catalyzed Asymmetric Allylic Alkylatio...

TraceCERT® AAS, ICP and IC Standards

• TraceCERTシリーズの特徴 • AAS,ICP用単成分(1000mg/L) • ICP用高濃度単成分(10000mg/L) • ICP-MS用低濃度単成分(1mg/L) • ICP用 多元素混合標準液 • TraceCERTカスタム(特注) • イオンクロマトグラフィー カタログ発行しました! カタログ請求 ICH Q3D, USP <232>,Ph.Eur 5.20対応 医薬品中の元素不純物分析 詳細はこちら TraceCERT®とは? 無機物質のTraceCERTシリーズは、ISO 17025とISO Guide 34(ISO17034)のダブル認定のもと製造した認証標準物質(C...

Palladium-Catalyzed Reaction of Aryl Iodides with ortho- Bromoanilines and Norbornene/Norbornadiene: Unexpected Formation of Dibenzoazepine Derivatives-

The cross-coupling reaction of aryl bromides and iodides with aliphatic and aromatic thiols catalyzed by palladium complexes of the bisphosphine ligand CyPF-tBu (1) is reported. Reactions occur in excellent yields, broad scope, high tolerance of functional groups, and with turnover numbers that exce...

Mild Palladium-Catalyzed Cyanation of (Hetero)aryl Halides and Triflates in Aqueous Media-

The development of a novel Pd-catalyzed synthesis of (hetero)aromatic nitriles from the corresponding aryl chlorides and potassium hexacyanoferrate(II) is described. This novel protocol avoids the use of highly toxic alkali cyanides and proceeds in the presence of small amounts of palladium catalyst...

Purple Taiwan

Acetonitrile 貨號 品名 規格 151807-100G Acetonitrile-d3 100G 151807-10G-AMP Acetonitrile-d3 10G 151807-10G-GL Acetonitrile-d3 10G 151807-10X0.6ML Acetonitrile-d3 10X0.6ML 151807-10X0.75ML Acetonitrile-d3 10X0.75ML 151807-25G Acetonitrile-d3 25G 151807-50G Acetonitrile-d3 50G 151807-5G Acetonitrile-d3 5G 貨...

2021 默克化學年會 促銷優惠

我要登錄抽獎 溶劑 Solvents 買四送一 產品編號 產品名稱 包裝 1.00014.2511 Acetone EMSURE® ACS, ISO, Reag. Ph Eur (塑膠瓶) 2.5L 1.06009.2511 Methanol EMSURE® ACS, ISO, Reag. Ph Eur (塑膠瓶) 2.5L 1.09634.2511 2-Propanol EMSURE® ACS, ISO, Reag. Ph Eur (塑膠瓶) 2.5L 1.07021.2511 Acetone for analysis EMPARTA® ACS (塑膠瓶) 2.5L 1.07018.2511...

用于AAS和ICP的TraceCERT® 认证参考物质解决方案

TraceCERT® 认证参考物质(CRM)在经认证的实验中开发,符合ISO 17025(检测和校准实验室能力的一般要求)以及ISO Guide 34(参考物质生产者的一般要求)标准。 TraceCERT 产品特点 AAS和ICP单元素认证标准品 ICP多元素标准品 SP及EP混合物符合ICH Q3D U 定制化标准品解决方案 文献 认证参考物质的历史及生产/认证信息 TraceCERT®产品具有以下特点: • 起始原料的纯度最高 • 卓越的(瑞士计量学) 准确度水平,非常低的不确定性和批次特异值 • 可追溯至少两个独立的参考机构 (即NIST, BAM 或 SI unit kg) • 全面的...

Cross-Coupling Highly Selective Palladium-Catalyzed Secondary Alkylzinc Reagents with Heteroaryl Halides

The highly selective palladium-catalyzed Negishi coupling of secondary alkylzinc reagents with heteroaryl halides is described. The development of atseries of biarylphosphine ligands has led to the identification of an improved catalyst for the coupling of electron-deficient heterocyclic substrates....

Application Data for Palladium Catalysts

We offer a range of polymer-supported palladium catalysts for Suzuki and Heck reactions. Just like the traditional palladium catalysts that are used in solution phase, these polymer-supported catalysts produce pure compounds with high yields. Unlike the traditional catalysts, there is no need to add...

Heck Reaction

The Heck reaction is the palladium catalyzed cross-coupling reaction between alkenes, and aryl or vinyl halides (or triflates) to afford substituted alkenes.1,2 It is a useful carbon–carbon bond forming reaction with synthetic importance. The reaction proceeds in the presence of base and it is highl...

Asymmetric Allylic Alkylation in Chemical Synthesis

Introduction Advantages Pd-Catalyzed Asymmetric Allylic Alkylation: • Carbon Nucleophiles • Oxygen Nucleophiles • Nitrogen Nucleophiles • Sulfur Nucleophiles Asymmetric Allylic Alkylation: • Molybdenum-catalyzed Reactions Product Information Introduction Palladium-catalyzed asymmetric allylic alkyla...

PEPPSI™ Catalysts

Related Information • PEPPSI™-IPent for Demanding Cross-Coupling Reactions • Chemical Synthesis Technology Spotlights • Professor Product Portal • Chemical Synthesis • Catalysis and Inorganic Chemistry • ChemFiles 6.3 : PEPPSI™ Catalyst • PEPPSI™ Activation Guide PEPPSI™-IPr: An air- and water-stabl...

A-Phos Palladium Complexes for Efficient Suzuki Coupling

Introduction The Suzuki-Miyaura cross-coupling reaction of heteroaryl halides is of particular interest to the pharmaceutical industry since many biologically active compounds are accessed through this methodology. Currently, a need exists for efficient coupling of boronic acids with five-membered h...

Cross Coupling Reactions of Chiral Secondary Organoboronic Esters With Retention of Configuration-

We describe a systematic study of the scope and relationship between ligand structure and activity for a highly efficient and selective class of catalysts containing sterically hindered chelating alkylphosphines for the amination of heteroaryl and aryl chlorides, bromides, and iodides. In the presen...

Mild and General Conditions for Negishi Cross-Coupling Enabled by the Use of Palladacycle Precatalysts

A wide range of biaryls were synthesized by palladium-catalyzed Negishi cross-couplings at ambient temperature or with low catalyst loading. This protocol features the use of a recently reported aminobiphenyl palladacycle precatalyst to generate the catalytically active XPhos-�Pd(0) species. Signifi...

Landis Ligands in Chemical Synthesis

Diazaphospholane Ligands for Catalytic Asymmetric Transformations Introduction The interest in asymmetric reactions has been growing for the past 40 years. To address the challenges of synthesizing chiral building blocks with high yields and high selectivities, researchers developed a broad range of...

Highly Selective Palladium-Catalyzed Cross-Coupling of Secondary Alkylzinc Reagents with Heteroaryl Halides | Materials & Procedure

The highly selective palladium-catalyzed Negishi coupling of secondary alkylzinc reagents with heteroaryl halides is described. The development of atseries of biarylphosphine ligands has led to the identification of an improved catalyst for the coupling of electron-deficient heterocyclic substrates....

Synthesis and Application of Palladium Precatalysts that Accommodate Extremely Bulky Di-tert-butylphosphino Biaryl Ligands

An umpolung approach to the synthesis of diaryl ketones has been developed based on in situ generation of acyl anion equivalents and their catalytic arylation. This method entails the base-promoted, palladium-catalyzed direct C-H arylation of 2-aryl-1,3-dithianes with aryl bromides. Use of MN-(SiMe3...

Nanoparticulate Rh and Pd Catalysts

The mild hydrogenation of a variety of arenes—such as benzene, mono- and disubstituted benzenes, naphthalene, and quinoline— has been achieved by using rhodium nanoparticles entrapped in a highly porous and fibrous boehmite (Al(O)OH) matrix (Table 1).1 The Rh/boehmite system has performed very favor...