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812684-99-4

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812684-99-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 812684-99-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,1,2,6,8 and 4 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 812684-99:
(8*8)+(7*1)+(6*2)+(5*6)+(4*8)+(3*4)+(2*9)+(1*9)=184
184 % 10 = 4
So 812684-99-4 is a valid CAS Registry Number.

812684-99-4Downstream Products

812684-99-4Relevant articles and documents

Lithiation of 2-aryl-2-(chloroaryl)-1,3-dioxolanes and its application in the synthesis of new ortho-functionalized benzophenone derivatives

Lukacs, Gyula,Porcs-Makkay, Marta,Simig, Gyula

, p. 4130 - 4140 (2007/10/03)

2-Aryl-2-(chloroaryl)-1,3-dioxolanes 4 were lithiated ortho to the ketal group of the chloroaryl ring by treatment with butyllithium in THF between -78 and 0°C. The site selectivity of some of the deprotonation reactions was rationalized by the long-range effect of the 4-chloro substituent. The lithio species thus generated were treated with various electrophiles to give ortho-functionalized benzophenone derivatives. Intramolecular competition between the aryl rings was observed in the lithiation of 2-(4-chlorophenyl)-2- (4-fluorophenyl)-1,3-dioxolane (4s). Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.

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