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127811-20-5

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127811-20-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 127811-20-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,7,8,1 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 127811-20:
(8*1)+(7*2)+(6*7)+(5*8)+(4*1)+(3*1)+(2*2)+(1*0)=115
115 % 10 = 5
So 127811-20-5 is a valid CAS Registry Number.

127811-20-5Relevant articles and documents

Nitroaldol (Henry) reaction catalyzed by amberlyst A-21 as a far superior heterogeneous catalyst

Ballini, Roberto,Bosica, Giovanna,Forconi, Paola

, p. 1677 - 1684 (2007/10/03)

β-Nitroalcohols can be efficiently obtained with the help of Amberlyst A-21, as heterogeneous basic catalyst, with or without solvent. This method is far superior to the heterogeneous catalysts previously reported for the nitroaldol (Henry) reaction, in f

Stereochemical control in microbial reduction. 12. (S)-4-nitro-2-butanol as a source to synthesize natural products

Nakamura,Kitayama,Inoue,Ohno

, p. 91 - 96 (2007/10/02)

(S)-(+)-4-Nitro-2-butanol (1) obtained by the stereoselective reduction of 4-nitro-2-butanone by bakers' yeast was employed for the syntheses of natural products. A precursor of (+)-brefeldin A is synthesized starting from this chiral building block by 10 steps short-cut procedure compared with the shortest method so far reported. (S)-(+)-Sulcatol is obtained in much better enantiomeric purity than those reported. The reactivity of 1 in base-catalyzed condensations with Michael acceptors or aldehydes is largely affected by a base employed as the catalyst.

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