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186135-56-8

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186135-56-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 186135-56-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,1,3 and 5 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 186135-56:
(8*1)+(7*8)+(6*6)+(5*1)+(4*3)+(3*5)+(2*5)+(1*6)=148
148 % 10 = 8
So 186135-56-8 is a valid CAS Registry Number.

186135-56-8Downstream Products

186135-56-8Relevant articles and documents

Domino syntheses of five-, six- and seven-membered O-, N- and S-heterocycles from α-, β- and γ-substituted carboxylic esters

Loeffler,Schobert

, p. 2799 - 2802 (2007/10/03)

By a one-pot procedure, tetronic acids, tetronates, coumarins, benzoxepinones and their N- and S-analogues are readily accessible from keteneylidene(triphenyl)phosphorane 2 and carboxylic esters bearing OH, NHR or SH groups in an α-, β- or γ-position by an addition/Wittig olefination/(Claisen rearrangement) sequence. This cascade can be controlled by temperature variation. Extension of this procedure by a further addition step yielding annulated bisheterocycles such as the furoquinolone 28 is possible in some cases.

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