38424-10-1

Upstream product

• 29559-27-1 1-methyl-4-(nitromethyl)benzene 
• 589-18-4 4-Methylbenzyl alcohol 
• 106-42-3 para-xylene 
• 4413-31-4 Methylchlor 
• 4528-66-9 bis(4-methylphenyl)-acetaldehyde 
• 2032-35-1 Bromoacetaldehyde diethyl acetal 
• 4294-57-9 para-methylphenylmagnesium bromide 
• 4702-76-5 4,4'-dimethylbenzaldazine 
• 6749-78-6 4-methylphenylmagnesium iodide 
• 621-62-5 chloroacetaldehyde diethyl acetal 
• 20710-51-4 4,4'-Dimethyl-bis-thiobenzoyldisulfid 
• 23304-24-7 p-tolyldiazomethane 
• 63385-22-8 p-methyldithiobenzoic acid ethyl ester 
• 51419-59-1 4-methylbenzylsulfonyl chloride 

Downstream Products

• 23843-15-4 4,4'-trans-(4-Isopropyl-styryl)-trans-stilben 
• 101111-08-4 4-methyl 4'-bromomethyl stilbene 
• 60682-97-5 4,4'-bis(bromomethyl)stilbene 
• 38424-23-6 meso-p,p'-dimethylstilbene dibromide 
• 99-94-5 p-Toluic acid 
• 18869-29-9 (E)-4,4'-dimethylstilbene 
• 1576-67-6 3,6-dimethylphenanthrene 
• 3719-84-4 2,3-bis(4-methylphenyl)quinoxaline 
• 162407-11-6 2,3-di-p-tolyl-1,4-diazaspiro[4.5]deca-1,3-diene 
• 3457-48-5 1,2-di(4-methylphenyl)-1,2-ethanedione 
• 538-39-6 1,2-di-p-tolylethane 
• 120336-96-1 N-<(4-Methylphenyl)sulfonyl>-4-methylbenzenecarboxamide 
• 75159-10-3 N-(4-methylbenzylidene)-p-toluenesulfonamide 
• 104-87-0 4-methyl-benzaldehyde 

Relevant academic research and scientific papers

STEREOCHEMISTRY OF THE COPPER PERCHLORATE OR BROMIDE-CATALYZED DECOMPOSITION OF ARYLDIAZOMETHANES TO STILBENES

Several phenyldiazomethanes easily decompose to cis- and trans-stilbenes when treated with catalytic amounts of copper perchlorate or copper bromide at 20 deg C.The preferential formation of cis isomer is particularly noteworthy.The stereochemistry and the mechanism of these reactions will be discussed.

The Radical Anions of Paracyclophane-1,9-diene and Some of its Derivatives. An Unexpected Conformational Interconversion

The radical anions of paracyclophane-1,9-diene (2) and its 1,10,12,13,15,16-hexadeuterio derivative 2-D6, as well as those of 4,5,7,8-tetramethylparacyclophane-1,9-diene (3) and its 12,13,15,16-tetradeuterio derivative 3D4, have been studied by

Synthesis, crystal structure, and catalytic activity of bridged-bis(N-heterocyclic carbene) palladium(II) complexes in selective Mizoroki-Heck cross-coupling reactions

A series of three 1,3-propanediyl bridged bis(N-heterocyclic carbene)palladium(II) complexes (Pd-BNH1, Pd-BNH2, and Pd-BNH3), with + I effect order of the N-substituents of the ligand (isopropyl > benzyl > methoxyphenyl), was the subject of a spectroscopic, structural, computational and catalytic investigation. The bis(NHC)PdBr2 complexes were evaluated in Mizoroki-Heck coupling reactions of aryl bromides with styrene or acrylate derivatives and showed high catalytic efficiency to produce diarylethenes and cinnamic acid derivatives. The X-ray structure of the most active palladium complex Pd-BNH3 shows that the Pd(II) center is bonded to the two carbon atoms of the bis(N-heterocyclic carbene) and two bromide ligands in cis position, resulting in a distorted square planar geometry. The NMR data of Pd-BNH3 are consistent with a single chair-boat rigid conformer in solution with no dynamic behavior of the 8-membered ring palladacycle in the temperature range 25–120 °C. The catalytic activities of three Pd-bridged bis(NHC) complexes in the Mizoroki-Heck cross-coupling reactions were not found to have a direct correlation with +I effect order of the N-substituents of the ligand. However, a direct correlation was found between the DFT calculated absolute softness of the three complexes with their respective catalytic activity. The highest calculated softness, in the case of Pd-BNH3, is expected to favor the coordination steps of both the soft aryl bromides and alkenes in the Heck catalytic cycle.

Palladium nanoparticlesin situsynthesized onCyclea barbatapectin as a heterogeneous catalyst for Heck coupling in water, the reduction of nitrophenols and alkynes

This study develops an effective method for thein situsynthesis of palladium nanoparticles (PdNPs) usingCyclea barbatapectin as a green reducing and stabilizing reagent. The PdNP@pectin nanocomposite was well characterized by analysis techniques such as UV-vis, FTIR, EDX, XRD, SEM, HR-TEM and STEM-mapping. Crystalline PdNPs were found to be distributed in the size range of 1-25 nm with the highest frequency of 6-12 nm. PdNP@pectin exhibited excellent recyclable catalysis activity for the Heck coupling reaction in water medium. The kinetics and recyclability of nanoparticles were investigated for the catalytic reduction ofo-,m- andp-nitrophenol. The result showed a good catalysis efficiency with five successful recycles without compromising much. In particular, the nanocomposite was used as a catalyst for the conversion of alkynes intocis-alkenes with KOH/DMF as a hydrogenation source. The reaction was also utilized effectively for the synthesis of sex pheromones, includingPlutella xylostella((Z)-11-hexadecen-1-yl acetate) andCylas formicarius((Z)-3-dodecen-1-yl(E)-2-butenoate) with the total yields of 70% and 68%, respectively. Therefore, PdNPs supported onC. barbatapectin are promising catalysis materials for application in various fields.

Porous organic polymer supported rhodium as a heterogeneous catalyst for hydroformylation of alkynes to α,β-unsaturated aldehydes

A new porous organic polymer supported rhodium catalyst (Rh/POL-BINAPa&PPh3) has been developed for the hydroformylation of various alkynes to afford the corresponding α,β-unsaturated aldehydes with high chem- and stereoselectivity, excellent catalytic activity and good reusability (10 cycles). The heterogeneous catalyst exhibited more catalytic activity than the comparable homogeneous Rh/BINAPa/PPh3 system.

Synthesis of [7]Helicene Enantiomers and Exploratory Study of Their Conversion into Helically Chiral Iodoarenes and Iodanes

The facile and convenient preparation of both enantiomers of a [7]helicene scaffold from inexpensive (l)-(+)-tartaric acid and 4-methylstyrene is described. These helical structures were transformed into bis-iodinated ether derivatives in order to explore their potential as precursors of novel chiral organoiodane reagents or as iodoarene pre-catalysts. Promising results were obtained in hydroxylative phenol dearomatization/[4+2] cycloaddition cascade and dearomative spirolactonization reactions with encouraging enantiomeric excesses.

Synthesis and Catalytic Applications of [N,N]-Pyrrole Ligands for the Regioselective Synthesis of Styrene Derivatives

We report the synthesis of two [N,N]-donor ligands (5 a–b) containing a 2-chalcogenazoline as the structural motif. These compounds were synthesized from a common intermediate Fischer type aminocarbene complex (3). The palladium-complexes of these [N,N]-donor ligands were successfully used as catalytic precursors in the Mizoroki-Heck coupling reaction between aryl halides and methyl acrylate, styrene and ethylene. For methyl acrylates, high yields with TOF values between 0.6 and 5.5×105 h?1 were obtained. In the case of ethylene, we reached high regioselectivities to obtain a diversity of styrene derivatives under soft pressure conditions, with good values of TON and TOF. (Figure presented.).

Metal-catalyzed formal amidation of alkenes under CO-free condition

An effective procedure for synthesis of amides from alkenes and [Formula presented] via Pd and Fe catalysts under mild conditions is described. A series of benzamides containing various functional groups can be obtained in reasonable yield and the possible reaction pathway is proposed in this Letter.

Immobilized Pd on (S)-methyl histidinate-modified multi-walled carbon nanotubes: A powerful and recyclable catalyst for Mizoroki-Heck and Suzuki-Miyaura C-C cross-coupling reactions in green solvents and under mild conditions

A stable and powerful heterogeneous palladium catalyst was synthesized using immobilized palladium on (S)-methyl histidinate bonded onto the surface of multi-walled carbon nanotubes. The catalyst was characterized using a combination of Fourier transform infrared and X-ray photoelectron spectroscopies, transmission electron microscopy, X-ray powder diffraction and inductively coupled plasma, thermogravimetric and elemental analyses. This new air- and moisture-stable phosphine-free palladium catalyst was found to be highly active and reusable in Mizoroki-Heck and Suzuki-Miyaura cross-coupling reactions in poly(ethylene glycol) and aqueous ethanol as green solvents using an extremely small amount of palladium under mild conditions.

Regioselective aerobic oxidative Heck reactions with electronically unbiased alkenes: Efficient access to α-alkyl vinylarenes

Branched-selective oxidative Heck coupling reactions have been developed between arylboronic acids and electronically unbiased terminal alkenes. The reactions exhibit high catalyst-controlled regioselectivity favoring the less common branched isomer. The reactions employ a catalyst composed of Pd(TFA)2/dmphen (TFA = trifluoroacetate, dmphen = 2,9-dimethyl-1,10-phenanthroline) and proceed efficiently at 45-60 °C under 1 atm of O2 without requiring other additives. A broad array of functional groups, including aryl halide, allyl silane and carboxylic acids are tolerated.