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53857-09-3

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53857-09-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 53857-09-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,8,5 and 7 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 53857-09:
(7*5)+(6*3)+(5*8)+(4*5)+(3*7)+(2*0)+(1*9)=143
143 % 10 = 3
So 53857-09-3 is a valid CAS Registry Number.

53857-09-3Relevant articles and documents

Route to Highly Substituted Pyridines

Hilf, Justin A.,Holzwarth, Michael S.,Rychnovsky, Scott D.

, p. 10376 - 10382 (2016/11/17)

Pyridine rings are common structural motifs found in a number of biologically active compounds, including some top-selling pharmaceuticals. We have developed a new approach to access substituted pyridines. The method aims to provide a reliable synthesis of a diverse range of substituted pyridines through a three-step procedure. Readily available enones are first converted into 1,5-dicarbonyls through a two-step Hosomi-Sakurai allylation/oxidative cleavage sequence, which is followed by subsequent cyclization to the corresponding pyridine using hydroxylamine hydrochloride. A variety of substituted pyridines have been synthesized using this method.

Synthesis of N,N-Bis(nonaflyl) squaric acid diamide and its application to organic reactions

Cheon, Cheol Hong,Yamamoto, Hisashi

scheme or table, p. 539 - 540 (2010/08/07)

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Development of N,N-bis(perfluoroalkanesulfonyl)squaramides as new strong Br?nsted acids and their application to organic reactions

Cheon, Cheol Hong,Yamamoto, Hisashi

supporting information; experimental part, p. 4257 - 4264 (2010/07/06)

New strong Br?nsted acids derived from a squaric acid scaffold bearing different perfluoroalkanesulfonyl groups have been developed and applied to several organic reactions. These squaramides are bench-stable and exhibit much higher reactivities in several organic reactions than squaric acid itself. N,N-Bis(trifluoromethanesulfonyl)squaramide 2a was applied to the Mukaiyama aldol reaction and Mukaiyama Michael reaction. Mechanistic studies revealed that the Br?nsted acid might be the predominant catalyst through direct protonation of carbonyl compound by the acid itself rather than the silylated Br?nsted acid. The utility of this acid 2a was further extended to Hosomi-Sakurai allylation of aldehydes and a carbonyl-ene reaction. Furthermore, other squaramides 2b and c bearing longer perfluoroalkyl chains have been developed, which are also bench-stable and displayed similar reactivities with squaramide 2a in several organic reactions.

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