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57641-21-1

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57641-21-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57641-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,6,4 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 57641-21:
(7*5)+(6*7)+(5*6)+(4*4)+(3*1)+(2*2)+(1*1)=131
131 % 10 = 1
So 57641-21-1 is a valid CAS Registry Number.

57641-21-1Relevant articles and documents

An economical noncatalytic approach to the synthesis of congested diaryl ethers and aryl benzyl thioethers through C-C insertion

Farhanullah,Ji Ram, Vishnu

body text, p. 2265 - 2268 (2009/12/24)

An efficient one-pot synthesis of diaryl ethers and aryl benzyl thioethers has been delineated through base-induced ring transformation of 6-aryl-4-methylthio-2H-pyran-2-one-3-carbonitriles, methyl 6-aryl-4-methylthio- 2H-pyran-2-one-3-carboxylates and 6-aryl-4-(piperidin-1-yl)-2H-pyran-2-one-3- carbonitriles by either 1-phenoxypropan-2-one, 1,3-diphenoxypropan-2-one or 4-arylthiobutan-2-one, under very mild reaction conditions, in excellent yield. Georg Thieme Verlag Stuttgart.

CYSTEINE PROTEASE INHIBITORS EFFECTIVE FOR IN VIVO USE

-

, (2008/06/13)

A method of treating medical conditions with proteinase inhibitors of the formula: STR1 wherein B is H or an amino acid blocking group for the N-terminal amino acid nitrogen;R. sub.1 is an optionally protected α-amino acid side chain such that P. su

A novel reaction for the functionalization of epoxy resins: New regio- and chemoselective ring-opening of epoxides with aryl silyl ether catalyzed by cesium fluoride

Nambu,Endo

, p. 1723 - 1726 (2007/10/02)

By use of cesium fluoride as a catalyst, aryl or alkyl glycidyl ethers were ring-opened by aryl trimethylsilyl ether to produce O-protected aryloxyhydrins with a quantitative regioselectivity for the first time. Alkyl silyl ether was ineffective for this ring-opening.

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