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500055-91-4

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500055-91-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 500055-91-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,0,0,0,5 and 5 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 500055-91:
(8*5)+(7*0)+(6*0)+(5*0)+(4*5)+(3*5)+(2*9)+(1*1)=94
94 % 10 = 4
So 500055-91-4 is a valid CAS Registry Number.

500055-91-4Relevant articles and documents

Facile regiocontrolled three-step synthesis of poly-substituted furans, pyrroles, and thiophenes: Consecutive michael addition of methyl cyanoacetate to α,β-enone, CuI-mediated aerobic oxidation, and acid-catalyzed paal-knorr synthesis

Kim, Se Hee,Lim, Jin Woo,Lim, Cheol Hee,Kim, Jae Nyoung

scheme or table, p. 620 - 624 (2012/05/05)

An efficient synthesis of poly-substituted furans, pyrroles, and thiophenes was carried out in a regiocontrolled manner via a three-step process; (i) conjugate addition of methyl cyanoacetate derivatives to α,β-enones, (ii) CuI-mediated aerobic oxidation,

Etude de la reaction de Michael en presence de divers agents complexants des cations alcalins en milieu aprotique ou dans les conditions de transfert de phase

Cossentini, Moncef,Strzalko, Tekla,Seyden-Penne, Jaqueline

, p. 531 - 534 (2007/10/02)

Michael addition of methyl cyanoacetate to benzylideneacetophenone 5a or benzylideneacetone 5b, in THF, under LiOt-Bu or KF catalysis takes place only in the presence of complexing agents for the cation.With LiO.t.Bu, HMPA, diHMPA, NIPA or 12-crown-4 show

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