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278175-48-7

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278175-48-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 278175-48-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,8,1,7 and 5 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 278175-48:
(8*2)+(7*7)+(6*8)+(5*1)+(4*7)+(3*5)+(2*4)+(1*8)=177
177 % 10 = 7
So 278175-48-7 is a valid CAS Registry Number.

278175-48-7Relevant articles and documents

Palladium-Catalyzed Amination of Aryl Nonaflates

Anderson, Kevin W.,Mendez-Perez, Maria,Priego, Julian,Buchwald, Stephen L.

, p. 9563 - 9573 (2007/10/03)

The first detailed study of the palladium-catalyzed amination of aryl nonaflates is reported. Use of ligands 2-4 and 6 allows for the catalytic amination of electron-rich and -neutral aryl nonaflates with both primary and secondary amines. With use of Xantphos 5, the catalytic amination of a variety of functionalized aryl nonaflates resulted in excellent yields of anilines; even 2-carboxymethyl aryl nonaflate is effectively coupled with a primary alkylamine. Moderate yields were obtained when coupling halo-aryl nonaflates with a variety of amines, where in most cases the aryl nonaflate reacted in preference to the aryl halide. Overall, aryl nonaflates are an effective alternative to triflates in palladium-catalyzed C-N bond-forming processes due to their increased stability under the reaction conditions.

Regioselective synthesis of natural and unnatural (Z)-3-(1- alkylidene)phthalides and 3-substituted isocoumarins starting from methyl 2- hydroxybenzoates

Bellina, Fabio,Ciucci, Donatella,Vergamini, Piergiorgio,Rossi, Renzo

, p. 2533 - 2545 (2007/10/03)

(Z)-3-(1-Alkylidene)phthalides and 3-substituted isocoumarins, which include compounds bearing a substituent on their benzene ring, have been selectively and efficiently synthesized by a new protocol which involves: (i) the conversion of methyl 2-hydroxybenzoates into the corresponding nonaflates; (ii) Pd-catalyzed alkynylation reactions of these derivatives; (iii) the conversion of the so obtained methyl 2-(1-alkynyl)benzoates into the corresponding carboxylic acids followed by a transition metal-catalyzed heteroannulation reaction. This procedure has been used to prepare either natural products such as senkyunolide B, senkyunolide C, 3-propylisocoumarin and artemidin, or the MEM-ether of senkyunolide E. The regioselectivity of the transition metal-catalyzed cyclization reactions of 2-(1-alkynyl)benzoic acids has proven to be affected either by the catalyst used or the type of 1- alkynyl group present in these carboxylic acids. (C) 2000 Elsevier Science Ltd.

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