Cas 205757-13-7,9-(tropylidenehydrazono)fluorene

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Check Digit Verification of cas no

The CAS Registry Mumber 205757-13-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,7,5 and 7 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 205757-13:
(8*2)+(7*0)+(6*5)+(5*7)+(4*5)+(3*7)+(2*1)+(1*3)=127
127 % 10 = 7
So 205757-13-7 is a valid CAS Registry Number.

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205757-13-7Relevant articles and documents

Synthesis and Properties of 9-(Tropylidenehydrazono)fluorene and Related Compounds

Minabe, Masahiro,Nozawa, Toshiya,Kurose, Tomoko,Kimura, Takao,Tsubota, Motohiro

, p. 693 - 697 (1998)

9-(Tropylidenehydrazono)fluorene (1) was obtained by a reaction between 9-fluorenone hydrazone and tropylium tetrafluoroborate. ccompanied by 9-fluorenone azine, 9-(benzylidenehydrazono)fluorene, and 9,9-ditropylfluorene. The amination of 1 occurred at the 2-position of the tropylidene moiety. The addition of tosyl isocyanate to 1 gave the [8 +2] cycloadduct at the 2,4,6-cydoheptatrien-1-imine structure.

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205757-13-7