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129939-42-0

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129939-42-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 129939-42-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,9,3 and 9 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 129939-42:
(8*1)+(7*2)+(6*9)+(5*9)+(4*3)+(3*9)+(2*4)+(1*2)=170
170 % 10 = 0
So 129939-42-0 is a valid CAS Registry Number.

129939-42-0Relevant articles and documents

Synthesis of all four homochiral stereoisomers of methyl 3-phenyl-1H-aziridine-2-carboxylate

Thijs, Lambertus,Orskamp Jos,Adriaan,Marielle,Eenstra, Rolf W.,Legters, Johan,Zwanenburg, Binne

, p. 2611 - 2622 (2007/10/02)

Sodium -E3-phenylglycidate (±)-2E was prepared using the Darzens' procedure. Classical resolution with 1-phenylethylamine afforded optically pure salts (+)-(2S,3R)-2E and (-)-(2R,3S)-2E. Alternatively, (±)-2E was converted into (±)-2Z by ring opening of ethyl ester (±)1E with hydrogen bromide, followed by recyclization and saponification. Classical resolution of (±)-2Z with ephedrine afforded optically pure salts (+)-(2S,3S)-2Z and (-)-(2R,3R)-2Z Treatment of the four sodium salts with sodium azide followed by esterification gave hydroxy azido esters 3, which were finally converted into the four homochiral stereoisomers of methyl 3-phenyl-1H-aziridine-2-carboxylate 5 in a reaction with triphenylphosphine and subsequent heating of the initially formed oxazaphospholidines 4.

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