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186521-87-9

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186521-87-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 186521-87-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,5,2 and 1 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 186521-87:
(8*1)+(7*8)+(6*6)+(5*5)+(4*2)+(3*1)+(2*8)+(1*7)=159
159 % 10 = 9
So 186521-87-9 is a valid CAS Registry Number.

186521-87-9Relevant articles and documents

Synthesis of sibutramine, a novel cyclobutylalkylamine useful in the treatment of obesity, and its major human metabolites

Jeffery, James E.,Kerrigan, Frank,Miller, Thomas K.,Smith, Graham J.,Tometzki, Gerald B.

, p. 2583 - 2589 (1996)

Synthetic routes to N-{1-[1-(4-chlorophenyl)cyclobutyl]-3-methylbutyl}-N,N-dimethylamine (sibutramine) 1 and its demethylated and hydroxylated human metabolites N-{1-[1-(4-chlorophenyl)cyclobutyl]-3-methyibutyl}-N-methylamine2, 1-[1-(4-chiorophenyl)cyclobutyl]-3-methylbutylamine 3, 4-amino-4-[1-(4-chlorophenyl)cyclobutyl]-2-methylbutan-1-ol 4 and c-3-(1-amino-3-methylbutyl)-3-(4-chlorophenyl)cyclobutan-r-1-ol 5a are described. Key steps are tandem Grignard-reduction reactions on 1-(4-chlorophenyl)cyclobutanecarbonitrile 7 and its 3-(tetrahydropyran-2-yloxy)-substituted analogue 14 and a convenient one-pot conversion of 4-chlorophenylacetonitrile 6 into the 3-hydroxycyclobutanecarbonitrile 13.

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