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81638-04-2

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81638-04-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81638-04-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,3 and 8 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 81638-04:
(7*8)+(6*1)+(5*6)+(4*3)+(3*8)+(2*0)+(1*4)=132
132 % 10 = 2
So 81638-04-2 is a valid CAS Registry Number.

81638-04-2Upstream product

81638-04-2Relevant articles and documents

ORGANISCHE PHOTOCHEMIE XLIII. Diphenylphosphinigsaeure, Hetero- und Carbocyclen aus ortho-?-funktionalisierten Aroyl-Diphenylphosphinen durch UV-Bestrahlung in Loesung

Dankowski, Manfred,Praefcke, Klaus

, p. 131 - 140 (2007/10/02)

New aroyl diphenyl phosphines (1f-i) substituted with ?-functions in ortho-positions of the aroyl part have been synthesized and photolyzed in benzene.In two cases (1h and i) 1.2- and 1.4-addition products of photochemically formed diphenylphosphinous acid (3) with acetone or phenanthrene quinone (8) are isolated in 59percent yields.Moreover, in neighboring-group participations aroyl radicals formed by competing α-cleavages of 1g-i yield 5- and 6-membered hetero- and carbocycles: xanthone (6), 3,3'-dimethoxy 3,3'-diphthalidyl (7), or the phenanthrene derivative 9, respectively.

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