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99998-90-0

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99998-90-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99998-90-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,9,9 and 8 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 99998-90:
(7*9)+(6*9)+(5*9)+(4*9)+(3*8)+(2*9)+(1*0)=240
240 % 10 = 0
So 99998-90-0 is a valid CAS Registry Number.

99998-90-0Relevant articles and documents

Charge-Transfer Complex Promoted Regiospecific C?N Bond Cleavage of Vicinal Tertiary Diamines

Fu, Ying,Xu, Qin-Shan,Shi, Chun-Zhao,Du, Zhengyin,Xiao, Caiqin

supporting information, p. 3502 - 3506 (2018/09/14)

A catalyst-free, charge-transfer complex promoted coupling of sulfonyl chlorides with vicinal tertiary diamines to generate sulfonamides is presented. Mechanistic studies showed that these reactions are proceeded via charge transfer of vicinal tertiary diamines to sulfonyl chlorides, forming the unstable sulfonyl quaternary ammonium like complexes which induced the regiospecific intramolecular C?N bond cleavage of vicinal tertiary diamines. (Figure presented.).

Condensation of Alkanediamines with Formaldehyde; Intramolecular Disproportionation of N-Hydroxymethyl Groups into N-Methyl and N-Formyl Groups

Dale, Johannes,Sigvartsen, Turid

, p. 1064 - 1070 (2007/10/02)

The condensation of α,ω-alkanediamines NH2(CN2)nNH2 with aqueous formaldehyde has been studied by NMR spectroscopy of isolated products and of product mixtures.The condensation was reversible and gave products of widely different types depending on alkane chain length: bicyclic oxadiaza compounds (n = 2, 3, 4), a tricyclic tetraaza compound (n = 2), a quinquecyclic octaaza compound (n = 3), two-dimensional polymers (n = 4, 5).A slow irreversible rearrangement gave in two cases (n = 3, 4), unicyclic 1-formyl-3-methyl-1,3-diaza compounds.The condensation of N,N'-dimethyl-α,ω-alkandediamines CH3NH(CH2)nNHCH3 with aqueous formaldehyde was also studied.The reversible formation of simple unicyclic diaza compounds was observed in all cases (n = 2, 3, 4), but in one case (n = 2) there was again a slow irreversible rearrangement to the N-formyl-N,N'N'-trimethyl derivative.The rearrangement reaction involves a hydride shift and is strictly intramolecular.The conditions for its occurrence can be understood on a conformational basis.

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