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634598-39-3

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634598-39-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 634598-39-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,4,5,9 and 8 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 634598-39:
(8*6)+(7*3)+(6*4)+(5*5)+(4*9)+(3*8)+(2*3)+(1*9)=193
193 % 10 = 3
So 634598-39-3 is a valid CAS Registry Number.

634598-39-3Relevant articles and documents

Synthesis of Stereoisomeric Medium-Ring α,α′-Dihydroxy Cycloalkanones

Paquette, Leo A.,Hartung, Ryan E.,Hofferberth, John E.,Vilotijevic, Ivan,Yang, Jiong

, p. 2454 - 2460 (2007/10/03)

The stereochemical course of the epoxidation of the silyl enol ethers of 2-tert-butyldimethylsilyl-oxycycloheptanone and -cyclooctanone has been investigated and shown to proceed exclusively anti to the existing α-substituent. 2-(Benzyloxy)cyclooctanone b

Divergent regioselectivity in the base-promoted reactions of cyclic eight-membered α-ketols with activated halides

Paquette, Leo A.,Vilotijevic, Ivan,Hilmey, David,Yang, Jiong

, p. 463 - 466 (2007/10/03)

(Matrix presented) Deprotonation of 2-hydroxycyclooctanone followed by exposure to an allylic or benzylic halide proceeds very selectively to give the product of C-alkylation. The effect of Δ5,6-unsaturation is to promote instead the formation of the O-alkylated derivative. This crossover in kinetic preference is attributed to an inability of the olefinic system to attain a conformation conducive to proton abstraction at C-2.

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