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485 matches found for BAR

Palladium-Catalyzed Amination of Unprotected Five-Membered Heterocyclic Bromides

An efficient method for the palladium-catalyzed amination of unprotected bromoimidazoles and bromopyrazoles is presented. The transformation is facilitated by the use of our newly developed Pd precatalyst based on the bulky biarylphosphine ligand tBuBrettPhos (L4). The mild reaction conditions emplo...

BIOshell™ A160 Peptide CN, 5 μm HPLC Columns - BIOshell™ HPLC Columns

BIOshell A160 Peptide CN columns packed with 5 m particles, 160 Å pores, provide similar resolution in shorter time than 3 m porous columns, and higher resolution than 5 m porous columns.BIOshell A160 Peptide CN columns can be operated long term at pressures up to 600 bar (60 MPa or 8500 psi), tempe...

A Mild and Efficient Palladium-Catalyzed Cyanation of Aryl Chlorides with K4[Fe(CN)6]

The cross-coupling reactions of allylboronic acid pinacol ester derivatives with aryl and heteroaryl halides occurred with high selectivity (>97%) at the ?-carbon of the allylboron reagent in the presence of Pd-PEPPSI-IPent precatalyst and 5 M KOH in refluxing THF. In the case of trisubstituted ally...

Asymmetric Palladium-Catalyzed Intramolecular a-Arylation of Aldehydes-

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...

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Hydrogenation - Labware

Thalesnanos award winning H-Cube is a hydrogenation reactor that is able to generate its own hydrogen at high pressures using only water with no gas cylinders or compressors. Without requiring special laboratories, the H-Cube is able to give you the ability to perform even the most difficult hydroge...

Amide Coupling Kit

Product No. 802387 Compound Catalog No. Equivalents MW Density Amount mmol Kit Components COMU 712191 1.12 428.27 240 mg 0.56 2,6-Lutidine 336106 3.26 107.15 0.92 0.19 mL 1.63 TPGS-750-M 733857 1.002 1.0 mL User Supplied Amine [RNH2] 1.0 0.5 Carboxylic acid [RCOOH] 1.1 0.55 Please consult the Safety...

Protocol KitAlysis™ High-Throughput Miyaura Borylation Reaction Screening Kit

2 bases (KOAc, DIEA) 6 degassed solvents (toluene, DMA, THF, n-butanol, MeOH, MeCN) 6 pre-weighed catalysts (x4) Materials Required - Set up: • 1 mylar bag from the KitAlysis™ High-Throughput Miyaura Borylation Reaction Screening Kit and you will use the following components - 6 x 4 pre-weighed cata...

Palladium-Catalyzed N-Arylation of 2-Aminothiazoles

The chemoselective and complementary Pd- and Cu-catalyzed N-arylation of 2-aminobenzimidazoles is described. Selective N-arylation of the amino group was achieved with a Pd-catalyzed method, while selective N-arylation of azole nitrogen was achieved with a Cu-catalyzed procedure An oven-dried vial w...

Medium (5,6,7) Ring-Closing Metathesis Procedure

6 pre-weighed catalysts (x4) 4 degassed solvents: Chlorobenzene (ClPh), Toluene (PhMe), Isopropyl Acetate (i-PrOAc), and Methyl-THF (Me-THF) 1 (optional) acid additive (degassed neat TFA) • 1 mylar (foil) bag from the KitAlysis Grubbs Metathesis Reaction Screening Kit and you will use the following ...

Pressure Conversion

Use this pressure conversion table chart to convert pressure units. To use the chart, find the unit of pressure you want to convert in the left hand column and multiply it by the value in the corresponding pressure unit column. The handy pressure converter table is used for converting pressure units...

Typical Procedures for Polymerizing via ATRP

The following two procedures describe two ATRP polymerization reactions as performed by Prof. Dave Hadddleton′s research group at the University of Warwick. The polymerization is carried out under oxygen free conditions. First the transition metal salt is deoxygenated and then the solution, followed...

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Aalborg Digital Mass Flowmeters - Mass Measurement

These easy to use instruments can be used to measure gas flow rates for common GC gases. The 1/4” NPT fittings on both the inlet and outlet allows installation in-line to provide continuous measurements. These units can also be used as hand-held units by attaching a short length of flexible tubing t...

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...

BRAND micro tubes - BRAND Tubes

Micro tubes from BRAND have these quality features:Uniform lid thickness ensures trouble-free piercing.Consistent wall thickness.Tight fitting attached lid provides leak-free seal, yet reopens easily.High clarity.Autoclavable at 121 °C (2 bar), acc. DIN EN 285.Micro tubes with screw caps are ideal f...

A Bulky Biaryl Phosphine Ligand Allows for Palladium-Catalyzed Amidation of Five-Membered Heterocycles as Electrophiles

The palladium-catalyzed cascade reaction of 2-chloroaryl sulfonates with arylamine and amide nucleophiles provides direct access to�N-arylbenzimidazoles. This strategy selectively produces the heterocycles based on chemoselective oxidative addition. 2-Chloroaryl triflates (Tf) produce one regioisome...

Buchwald Hartwig Amination Kit

Product No. 802298 Compound Catalog No. Equivalents MW Density Amount mmol Kit Components [(π-allyl)PdCl]2 222380 0.016 365.89 3.2 mg 0.008 cBRIDP 693383 0.07 352.49 12.4 mg 0.035 Potassium t-butoxide 156671 1.64 112.21 92 mg 0.82 TPGS-750-M 733857 1.002 1.0 mL User Supplied Aryl bromide [ArBr] 1.0 ...

Negishi Kit

Product No. 802344 Compound Catalog No. Equivalents MW Density Amount mmol Kit Components PdCl2(Amphos)2 678740 0.01 708.07 3.6 mg 0.005 Zn dust 209988 3.0 65.39 100 mg 1.50 TMEDA T22500 2.0 116.20 0.775 0.15 mL 1.00 TPGS-750-M 733857 1.002 1.5 mL User Supplied Aryl bromide [ArBr] 1.0 0.50 Alkyl bro...

Protocol KitAlysis™ High-Throughput Base Reaction Screening Kit

7 pre-weighed bases 4 base solutions (DBU (neat), Et3N (neat), LiHMDS (1.0 M in THF), and NaOtBu (2.0 M in THF)) 4 solvents (MeOH, Toluene, DMF, and THF) Materials Required - Set up: • 1 mylar bag from the KitAlysis™ High-Throughput Base Screening Kit and you will use the following components - 7 x ...

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....

Step-by-Step Guide for KitAlysis™ High-Throughput Photocatalysis Reaction Screening Kit

24 pre-weighed catalysts 4 degassed solvents (DCM, DCE, DMF, MeCN) Note: While the above scheme depicts a generic decarboxylative coupling reaction, High-Throughput Photocatalysis Screening Kit can be used for any photocatalytic transformation Materials Required - Set up: • 1 mylar bag from the KitA...

Suzuki Kit

Product No. 802271 Compound Catalog No. Equivalents MW Density Amount mmol Kit Components Pd(dtbpf)Cl2 701602 0.026 651.75 9 mg 0.013 Triethylamine T0886 3.3 101.19 0.726 0.23 mL 1.65 TPGS-750-M 733857 1.002 1.0 mL User Supplied Aryl bromide [ArBr] 1.0 0.5 Arylboronic acid [ArB(OH)2] 1.0-2.0 0.5-1.0...

Development of Pd/C-Catalyzed Cyanation of Aryl Halides

An orthogonal set of catalyst systems has been developed for the Suzuki?Miyaura coupling of 3,3-disubstituted and 3-monosubstituted allylboronates with (hetero)aryl halides. These methods allow for the highly selective preparation of either the ?- or the ?-isomeric coupling product. Procedure 1: A s...

Mild and general palladium-catalyzed synthesis of methyl aryl ethers enabled by the use of a palladacycle precatalyst

A general method for the Pd-catalyzed coupling of methanol with (hetero)aryl halides is described. The reactions proceed under mild conditions with a wide range of aryl and heteroaryl halides to give methyl aryl ethers in high yield. An oven-dried 20 mL resealable screw-cap test tube?(A) equipped wi...

Suzuki-Miyaura Cross-Coupling of Potassium Trifluoro(N-methylheteroaryl)borates with Aryl and Heteroaryl Halides

A new bulky biarylphosphine ligand (L8) has been developed that allows the Pd-catalyzed C-O cross-coupling of a wide range of aryl halides and phenols under milder conditions than previously possible. A direct correlation between the size of the ligand substituents in the 2�, 4�, and 6� positions of...

Pressure-Temperature Nomograph

Slider A is currently locked as the pivot. Slider B is currently locked as the pivot. Slider C is currently locked as the pivot. A C K F Ra Re Observed Boiling Point at Pressure "P" (mmHg) B C K F Ra Re Boiling Point Corrected at 1 atm (760 mmHg) C mmHG kPa bar atm psi Pressure "P" (mmHg) 1 atm = 76...

Selective Monoarylation of Acetate Esters and Aryl Methyl Ketones Using Aryl Chlorides

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...

Efficient Pd-Catalyzed Amination Reactions for Heterocycle Functionalization

The Pd-catalyzed amination of unprotected benzo-fused heterocycles is reported, which allows for greater flexibility and efficiency in the modification of this important class of molecules. The generality of these simple and efficient procedures is demonstrated through the synthesis of a wide variet...

Labels and Markers - Labware

For any simple labeling task, there are plain paper labels and indelible markers. However, laboratory sample labeling presents many challenges such as solvent compatibility or the ability to remain in place during freezing and cryostorage. Systems designed specifically for laboratory research labe...

Coupler Configuration

Pure-Pac II® Assembly and Components /catalog/product/aldrich/Z560723 /catalog/product/aldrich/Z565547 /catalog/product/supelco/22700U /catalog/product/aldrich/Z685658 /catalog/product/aldrich/Z280240 /catalog/product/aldrich/Z562408 /catalog/product/aldrich/Z562300 /catalog/product/aldrich/Z562319 ...

Universal Protease Activity Assay: Casein as a Substrate

A. Abstract Proteases break peptide bonds. It is often necessary to measure and/or compare the activity of proteases. This non-specific protease activity assay may be used as a standardized procedure to determine the activity of proteases for quality control purposes. In this assay, casein acts as a...