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108545-81-9

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108545-81-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 108545-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,8,5,4 and 5 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 108545-81:
(8*1)+(7*0)+(6*8)+(5*5)+(4*4)+(3*5)+(2*8)+(1*1)=129
129 % 10 = 9
So 108545-81-9 is a valid CAS Registry Number.

108545-81-9Downstream Products

108545-81-9Relevant articles and documents

Metacyclophanes and Related Compounds. Part 16. Preparation of 8-Fluoro-t-butylmetacyclophanes and their Treatment with Aluminium Chloride-Nitromethane in Benzene

Yamato, Takehiko,Arimura, Takashi,Tashiro, Masashi

, p. 1 - 8 (2007/10/02)

The preparation of 8-fluoro-t-butylmetacyclophanes (5) are described.Dithiametacyclophane (3) and metacyclophane bis(sulphones) (4) were obtained as a mixture of transoid and cisoid conformers, but metacyclophanes (5) were exclusively obtained as the transoid conformer after pyrolysis of the sulphones (4).AlCl3-MeNO2-Catalyzed trans-t-butylation of 8-fluoro-16-methyl-5,13-di-t-butylmetacyclophane (5a) in benzene under a variety of conditions faild to give 8-fluoro-16-methylmetacyclophane (32) but, instead, the tetrahydropyrenes (33) and/or (34) were obtained depending upon the conditions used.Internally substituted metacyclophanes were isomerized to the strainless metacyclophanes and these were then oxidized to the tetrahydropyrene (33).

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