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20495-33-4

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20495-33-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20495-33-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,9 and 5 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 20495-33:
(7*2)+(6*0)+(5*4)+(4*9)+(3*5)+(2*3)+(1*3)=94
94 % 10 = 4
So 20495-33-4 is a valid CAS Registry Number.

20495-33-4Relevant articles and documents

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Ivanov,B.E.,Krokhina,S.S.

, (1971)

-

A new way for potential aminophosphonic acids precursors

Cristau, Henri-Jean,Lambert, Jean-Marc,Sarris, Anne,Pirat, Jean-Luc

, p. 125 (2007/10/03)

New five membered-ring 3,3-dihydro-1,4,2-oxazaphospholenes 1, potential precursors of aminophosphonic acids, have been synthesized and characterized by 1H, 13C and 31P NMR.

CONVERSION OF AMINO ACIDS AND DIPEPTIDES INTO THEIR PHOSPHONIC ANALOGS; Aminoalkylphosphonic acids and peptides II.

Oesapay, George,Szilagyi, Ildiko,Seres, Jenoe

, p. 2977 - 2984 (2007/10/02)

Acylamino carboxylic acids were degradated by the Hunsdiecker-reaction; the bromo-derivatives were reacted with NaPO(OC2H5)2.Aminophosphonic acids were obtained by acidic hydrolysis, and half-blocked derivatives by the selective removal of masking substituents.Two phosphonopeptides were also prepared by this route.

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