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251998-93-3

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251998-93-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 251998-93-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,1,9,9 and 8 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 251998-93:
(8*2)+(7*5)+(6*1)+(5*9)+(4*9)+(3*8)+(2*9)+(1*3)=183
183 % 10 = 3
So 251998-93-3 is a valid CAS Registry Number.

251998-93-3Downstream Products

251998-93-3Relevant articles and documents

Total synthesis of a nonclassical bioactive acetogenin, (+)-muconin

Yang, Wen-Qian,Kitahara, Takeshi

, p. 1451 - 1461 (2007/10/03)

A convergent total synthesis of the tetrahydropyran-bearing acetogenin (+)-muconin 1 is described. All five chiral building blocks 7, 9, 17, 21, and 29 were prepared from D-glutamic acid, respectively. Four out of them were used to furnish the alkyne 16 and the iodoalkyne 33, respectively, and palladium(0)-mediated cross-coupling of alkynes 16 and 33, followed by hydrogenation, afforded 36. Simultaneous deprotection of the MOM and TBS groups in 36 with BF3·Et2O in the presence of Me2S provided (+)-muconin 1. (C) 2000 Elsevier Science Ltd.

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