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21538-58-9

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21538-58-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21538-58-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,3 and 8 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21538-58:
(7*2)+(6*1)+(5*5)+(4*3)+(3*8)+(2*5)+(1*8)=99
99 % 10 = 9
So 21538-58-9 is a valid CAS Registry Number.

21538-58-9Relevant articles and documents

Preparation of Blatter Radicals via Aza-Wittig Chemistry: The Reaction of N-Aryliminophosphoranes with 1-(Het)aroyl-2-aryldiazenes

Savva, Anastasia C.,Mirallai, Styliana I.,Zissimou, Georgia A.,Berezin, Andrey A.,Demetriades, Marina,Kourtellaris, Andreas,Constantinides, Christos P.,Nicolaides, Constantinos,Trypiniotis, Theodossis,Koutentis, Panayiotis A.

, p. 7564 - 7575 (2017/07/26)

Reacting N-aryliminophosphoranes with 1-(het)aroyl-2-aryldiazenes in preheated diphenyl ether at ca. 150-250 °C for 5-25 min affords in most cases the 1,3-diaryl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yls (aka Blatter radicals) in moderate to good yields. Al

Catalytic oxidation of N -phenylamidrazones to 1,3-Diphenyl-1,4-dihydro-1, 2,4-benzotriazin-4-yls: An improved synthesis of blatters radical

Koutentis, Panayiotis A.,Lo Re, Daniele

experimental part, p. 2075 - 2079 (2010/08/13)

Blatters radical, 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (1a, R =H), and several of its C-7 substituted analogues (R =CF3, Cl, Br, I, Me, OMe) were prepared in good-to-excellent yields through catalytic oxidation of the corresponding

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