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51803-20-4

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51803-20-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51803-20-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,8,0 and 3 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 51803-20:
(7*5)+(6*1)+(5*8)+(4*0)+(3*3)+(2*2)+(1*0)=94
94 % 10 = 4
So 51803-20-4 is a valid CAS Registry Number.

51803-20-4Relevant articles and documents

Intramolecular imine cross-coupling in dibenzylidine sulfamides: Synthesis of unsymmetrical 1,2-diaryl ethanediamines

Pansare, Sunil V.,Malusare, Mahesh G.

, p. 2859 - 2862 (2007/10/03)

Intramolecular reductive cross-coupling of unsymmetrical dibenzylidene sulfamides generates the corresponding cyclic sulfamides in good yield. These intermediates are readily converted to the free, unsymmetrical 1,2-diaryl ethanediamines.

Reactions of Dibenzylidene Sulfamides with Amines

Knollmueller, Max,Kosma, Paul

, p. 489 - 500 (2007/10/02)

Addition of amines to dibenzylidene sulfamide 1 a yields the corresponding Schiff bases 3 a, b and monobenzylidene sulfamide 2.Reaction of several dibenzylidene sulfamides 1 with various lithium-amides gives N1-substituted N2-benzylsulfamoyl-benzamidines 7 a-k via an intramolecular hydride transfer reaction, whereas by treatment of 1 a with sodium amide 2-benzyl-3,5-diphenyl-3,4-dihydro-2H-1,2,4,6-thiatriazine-1,1-dioxide 8 is obtained, which on hydrolysis yields 9 and 11.Alkylation products are described , the isomeric products 12a/13a and 12b/13b are isolated, their structures are confirmed by synthesis, IR and NMR-spectra. - Keywords: Addition of amines to dibenzylidene sulfamide; Intramolecular hydride transfer; Sulfamoyl-benzamidines.

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