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137138-18-2

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137138-18-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137138-18-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,1,3 and 8 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 137138-18:
(8*1)+(7*3)+(6*7)+(5*1)+(4*3)+(3*8)+(2*1)+(1*8)=122
122 % 10 = 2
So 137138-18-2 is a valid CAS Registry Number.

137138-18-2Relevant articles and documents

Enantioselective biotransformation of a new theophylline derivative

Harsche,Oelschlaeger,Engel

, p. 593 - 595 (2007/10/02)

Reductive amination of 4 with (RS)-2 is an improved method to obtain 7-((RS)2-((RS)-1-Methyl-2-phenyl-ethylamino)propyl)-theophylline (3) (ratio of diastereomers 1:1) compared with SN-displacement of proxyphyllintosylate with (RS)-2 (ratio of diastereomers 9:1). Due to steric hindrance 3 is no noteworthy prodrug for the intermediate formation of (RS)-2 in rats. The enantioselectivity of 2 after a single oral dose of 3 is determined in 24-h urine by HPLC on a Cyclobond-column using the isoindole derivatives, formed from o-phthalaldehyde, thioglycolic acid, and 2. The R(-)-amphetamine isomer is formed to a lesser amount (34.8%, range 32-37%) than the S(+)-isomer (65.2%, range 63-68%).

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