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187874-87-9

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187874-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187874-87-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,8,7 and 4 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 187874-87:
(8*1)+(7*8)+(6*7)+(5*8)+(4*7)+(3*4)+(2*8)+(1*7)=209
209 % 10 = 9
So 187874-87-9 is a valid CAS Registry Number.

187874-87-9Downstream Products

187874-87-9Relevant articles and documents

Synthesis, reactions and theoretical studied of triazolotriazolopyrazinium-3-aminides

Crabb, Derek L.,Main, David A.,Morley, John O.,Preston, Peter N.,Wright, Stanley H. B.

, p. 49 - 58 (2007/10/03)

Triazolopyrimidinium-3-aminides 5a-h have been synthesised by treatment pyridin-6-yl thiosemicarbazide derivatives 7f-n with dicyclohexylcarbodiimide (DCC).The above aminides 5a-h were slowly hydrolysed in water but very rapidly hydrolysed in 5 M aqueous hydrochloric acid to give substituted 1,2,4-triazole derivatives (e.g. 5a,d,g -> 8e,a,f, respectively); related nucleophilic ring-opening reactions occurred when the aminides (cf. 5a-h) were treated with (separately) methanol and ethanol (e.g. 5d->8c and 8d, respectively).A series of analogous triazolopyrazinium-3-aminides 6a-e was prepared following the procedures described above.The pyrazinium aminides 6 are stable in aq. 2 M HCl, and a stable hydrochloride salt 13 was formed from one such substrate 6a.

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