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75849-14-8

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75849-14-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 75849-14-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,8,4 and 9 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 75849-14:
(7*7)+(6*5)+(5*8)+(4*4)+(3*9)+(2*1)+(1*4)=168
168 % 10 = 8
So 75849-14-8 is a valid CAS Registry Number.

75849-14-8Relevant articles and documents

Intramolecular Alkylation of Phenols. Part 5. A Regiospecific Anionic Ring Closure of Phenols via Quinone Methides

Murphy, William S.,Wattanasin, Sompong

, p. 1567 - 1577 (2007/10/02)

The bis-magnesium salts of the triols (6a) and (6h) cyclise when heated in benzene with high ortho-regiospecificity to the corresponding bis-phenols (7) and (8).The triols (6k) and (6o) under the same conditions cyclise with high para-regiospecificity to the corresponding bis-phenols (7) and (8).Both (6a) and (6h) cyclise via o-quinone methides, and (6k) and (6o) via p-quinone methides.Results from the use of, inter alia, 18-crown-6, indicate that the high ortho-regiospecificity of the cyclisation of (6a) and (6h) is due to intramolecular Mg(II) bridging of the intermediate o-quinone methides.The high para-regiospecificity of cyclisation of (6k) and (6o) is due to steric hindrance towards o-cyclisation of the intermediate p-quinone methides presented by the Mg(II) cation.The unexpected facility with which (6a) and (6k) undergo ring closure is discussed.

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