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147220-37-9

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147220-37-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 147220-37-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,7,2,2 and 0 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 147220-37:
(8*1)+(7*4)+(6*7)+(5*2)+(4*2)+(3*0)+(2*3)+(1*7)=109
109 % 10 = 9
So 147220-37-9 is a valid CAS Registry Number.

147220-37-9Downstream Products

147220-37-9Relevant articles and documents

Kinetic resolution of acyclic 1,2-diols using a sequential lipase- catalyzed transesterification in organic solvents

Theil,Weidner,Ballschuh,Kunath,Schick

, p. 388 - 393 (2007/10/02)

A method for the kinetic resolution of 3-(aryloxy)-1,2-propanediols rac- 1a-n without additional protection-deprotection steps using a lipase- catalyzed sequential transesterification with lipase amano PS has been developed. In the first step of this one-pot procedure the racemic 1,2-diols are acylated regioselectively at the primary hydroxy group without enantioselection. The subsequent acylation at the secondary hydroxy group of the formed primary monoacetate is responsible for high enantioselection. The enantioselectivity of this transformation depends significantly on the substitution pattern of the aryl ring and the organic solvent used. 3- (Aryloxy)-1,2-propanediols with substituents in the para-position show a much higher enantioselectivity than the corresponding derivatives with ortho- substituents. Among other substrates, the pharmaceuticals Mephenesin, Guaifenesin, and Chlorphenesin have been resolved. The replacement of the aryloxy by an alkyl substituent causes a dramatic decrease of enantioselectivity.

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