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180912-50-9

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180912-50-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 180912-50-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,0,9,1 and 2 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 180912-50:
(8*1)+(7*8)+(6*0)+(5*9)+(4*1)+(3*2)+(2*5)+(1*0)=129
129 % 10 = 9
So 180912-50-9 is a valid CAS Registry Number.

180912-50-9Relevant articles and documents

Synthesis of various model compounds for the central tricyclic ring system of popolophuanone E

Ueki, Yasuyuki,Itoh, Masanori,Katoh, Tadashi,Terashima, Shiro

, p. 5719 - 5722 (1996)

An efficient synthesis of various model compounds 4a-e for the tricyclic core of popolophuanone E (1), a novel marine natural product, was accomplished; the method features highly regioselective annulation of the phenols 5a-e with the 2,3-dichloro-1,4-benzoquinones 7, 7c-e. Preliminary studies definitely demonstrated the feasibility of our designed synthetic strategy for 1 (the phenolic subunit I + the quinone subunit II → 1).

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