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67698-90-2

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67698-90-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 67698-90-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,6,9 and 8 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 67698-90:
(7*6)+(6*7)+(5*6)+(4*9)+(3*8)+(2*9)+(1*0)=192
192 % 10 = 2
So 67698-90-2 is a valid CAS Registry Number.

67698-90-2Relevant articles and documents

Substituted 5,6,11,12-tetradehydrodibenzo[ a, e ]cyclooctenes: Syntheses, properties, and DFT studies of substituted sondheimer-wong diynes

Xu, Feng,Peng, Lifen,Shinohara, Kenta,Morita, Takamoto,Yoshida, Suguru,Hosoya, Takamitsu,Orita, Akihiro,Otera, Junzo

, p. 11592 - 11608 (2014)

Highly strained cyclic acetylenes 5,6,11,12-tetradehydrodibenzo[a,e]cyclooctenes (Sondheimer-Wong diynes) having various substituents on their benzene rings were synthesized successfully by one-pot treatment of the corresponding formyl sulfones with diethyl chlorophosphate/lithium hexamethyldisilazide (LiHMDS) and then lithium diisopropylamide (LDA). When mixtures of two types of formyl sulfones bearing different substituents were subjected to this protocol, the unsymmetrically substituted Sondheimer-Wong diynes could be synthesized in a stepwise manner by isolation of the heterocoupled vinyl sulfone intermediates followed by their treatment with LDA. The UV-vis absorption spectra and cyclic voltammograms of the substituted Sondheimer-Wong diynes were recorded. The electronic effect of substituents on the diynes was investigated in their click reactions and nucleophilic and electrophilic additions.

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