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13557-24-9

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13557-24-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 13557-24-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,5,5 and 7 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 13557-24:
(7*1)+(6*3)+(5*5)+(4*5)+(3*7)+(2*2)+(1*4)=99
99 % 10 = 9
So 13557-24-9 is a valid CAS Registry Number.

13557-24-9Relevant articles and documents

Preparation and reactions of functionalized magnesium carbenoids

Avolio, Salvatore,Malan, Christophe,Marek, Ilan,Knochel, Paul

, p. 1820 - 1822 (2007/10/03)

New functionalized magnesium carbenoids bearing an ester function have been prepared via an iodine-magnesium exchange reaction. These new carbenoids react with various electrophiles (60-88% yield). A substituted magnesium carbenoid has been prepared by su

Thioalkylation of Enolates, IV. α-Alkylidenecyclopentanones by α-Alkylidation of Methyl 2-Oxocyclopentanecarboxylate

Arnecke, Ralf,Groth, Ulrich,Koehler, Thomas

, p. 891 - 894 (2007/10/02)

An α-alkylidation of cyclopentanone was achieved in two reaction steps in an overall yield of 20 to 79percent via a zinc chloride-catalyzed thioalkylation of the zinc enolate of methyl 2-oxocyclopentanecarboxylate (3) and subsequent saponification/desulfurization of the β-(phenylthio) ketone intermediates 5.For the saponification/desulfurization step DABCO proved to be the reagent of choice and superior to the use of alkali or magnesium halides. - Key Words: Zinc enolates, thioalkylation of / Cyclopentanones, α-alkylidene

ZINC(II)-CHLORIDE INDUCED THIOALKYLATION OF ALUMINIUM ENOLATES; ENANTIOSELECTIVE SYNTHESIS OF ESTRADIOL-3-METHYL-17-tert-BUTYL DIETHER

Groth, Ulrich,Koehler, Thomas,Taapken, Thomas

, p. 7583 - 7592 (2007/10/02)

Zinc(II)-chloride induced thioalkylation of the aluminium enolate 6 generated by conjugate reduction of the enone 5 leads - directly or via its trimethylsilylenol ether 6 - to alkylated hydrindanones 10 which are important intermediates in the synthesis o

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