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191873-51-5

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191873-51-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 191873-51-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,8,7 and 3 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 191873-51:
(8*1)+(7*9)+(6*1)+(5*8)+(4*7)+(3*3)+(2*5)+(1*1)=165
165 % 10 = 5
So 191873-51-5 is a valid CAS Registry Number.

191873-51-5Relevant articles and documents

Synthesis of morphine fragments spiro[benzofuran-3(2H),4'-piperidine] and octahydro-1H-benzofuro[3,2-e]isoquinoline by intramolecular heck reaction

Cheng, Chen-Yu,Liou, Jing-Ping,Lee, Mei-Jing

, p. 4571 - 4574 (1997)

As a better alternative to radical cyclization, 5-(2-bromo-6-methoxyphenoxy)-2-methyl-1 ,2,3,4,5,6,7,8-octahydroisoquinoline (2) and its 1-oxo analog 3 underwent Pd-catalyzed intramolecular cyclization to give the tetracyclic (ACNO) morphine fragments 5 and 6 respectively. 4-[(2'-Iodo-6'-methoxyphenoxy)methyl]-1-ethoxycarbonyl-1,2,5,6, -tetrahydropyridine (11) reacted similarly to provide the tricyclic ANO fragment 12 in 70% yield and 45% e.e. when a Pd-(S)-BINAP complex was used as the catalyst.

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