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121073-36-7

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121073-36-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 121073-36-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,0,7 and 3 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 121073-36:
(8*1)+(7*2)+(6*1)+(5*0)+(4*7)+(3*3)+(2*3)+(1*6)=77
77 % 10 = 7
So 121073-36-7 is a valid CAS Registry Number.

121073-36-7Relevant articles and documents

Resolution of Binaphthols and Spirobiindanols Using Cholesterol Esterase

Kazlauskas, Romas J.

, p. 4953 - 4959 (2007/10/02)

Cholesterol esterase (EC 3.1.1.13) catalyzes the hydrolysis of steroid, binaphthol, and spirobiindanol esters.The hydrolysis of binaphthol and spirobiindanol esters is enantiospecific and can be used to resolve these materials.Simple, synthetic-scale (200 g) procedures are detailed for the resolution of -2,2'-diol (1) and 2,2',3,3'-tetrahydro-3,3,3',3'-tetramethyl-1,1'-spirobi-6,6'-diol (6).Resolution of 1 involved hydrolysis of the dipentanoate ester catalyzed by crude, inexpensive enzyme (bovine pancreas acetone powder) and yielded each enantiomer in > 60percent of theoretical yield with >/= 99percent enantiomeric purity.Similar resolution of 6 by hydrolysis of the dihexanoate ester yielded each enantiomer in > 50percent of theoretical yield with > 95percent enentiomeric purity.These resolution involve two enzymic reactions: hydrolysis of the diester to the monoester followed by hydrolysis of the monoester to the diol.A theoretical analysis of such two-step resolutions suggests that two-step resolutions can yield products with higher enantiomeric purity than can single-step resolutions.

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