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99902-26-8

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99902-26-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99902-26-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,9,0 and 2 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 99902-26:
(7*9)+(6*9)+(5*9)+(4*0)+(3*2)+(2*2)+(1*6)=178
178 % 10 = 8
So 99902-26-8 is a valid CAS Registry Number.

99902-26-8Relevant articles and documents

A highly stereoselective synthesis of the 1β-methylcarbapenem key intermediate from (R)-3-hydroxybutyric acid

Kobayashi, Yuko,Ito, Yoshio,Terashima, Shiro

, p. 55 - 66 (2007/10/02)

(3R,4R)-4-Acetoxy-3-[(R)-1-(formyloxy)ethyl]-2-azetidinone 6 could be prepared highly stereoselectivity from (R)-3-hydroxybutyric acid by employing the [2+2]-cycloaddition reaction of chlorosulfonyl isocyanate with the 2H,4H-1,3-dioxin derivative and the Baeyer-Villiger reaction accompanying novel cleavage of the acetal moiety. The Reformatsky reaction of 6 with sterically crowded 3-(2-bromopropionyl)-2-oxazolidone derivatives readily afforded the title key intermediate after sequential chemical manipulations.

ELECTROPHILIC AMINATION: ENANTIOSELECTIVE SYNTHESES OF D-ALLOTHREONINE AND L-THREONINE

Genet, J. P.,Juge, S.,Mallart, S.

, p. 6765 - 6768 (2007/10/02)

Starting from inexpensive polyhydroxybutanoate (PHB), D-allothreonine 1 and L-threonine 2 were synthetized by a sequence involving a diastereoselective electrophilic amination.When (R) 3-hydroxybutanoic acid was protected as dioxanone 9 very good yield (>95percent) and high diastereomeric excess (>99percent) were obtained in the amination step.

Optisch aktive Alkohole aus 1,3-Dioxan-4-onen; eine praktikable Variante der asymmetrischen Synthese unter nucleophiler Substitution an Acetalzentren

Seebach, Dieter,Imwinkelried, Rene,Stucky, Gerhard

, p. 182 - 183 (2007/10/02)

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