257-13-6 Usage
Synthesis Reference(s)
Journal of the American Chemical Society, 89, p. 5931, 1967 DOI: 10.1021/ja00999a033Journal of Heterocyclic Chemistry, 4, p. 209, 1967 DOI: 10.1002/jhet.5570040208
Check Digit Verification of cas no
The CAS Registry Mumber 257-13-6 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,5 and 7 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 257-13:
(5*2)+(4*5)+(3*7)+(2*1)+(1*3)=56
56 % 10 = 6
So 257-13-6 is a valid CAS Registry Number.
InChI:InChI=1/C14H10S/c1-3-7-13-11(5-1)9-10-12-6-2-4-8-14(12)15-13/h1-10H
257-13-6Relevant articles and documents
Facile synthesis of [1]benzothieno[3,2-b]benzothiophene from o-dihalostilbenes
Saito, Masahiko,Yamamoto, Tatsuya,Osaka, Itaru,Miyazaki, Eigo,Takimiya, Kazuo,Kuwabara, Hirokazu,Ikeda, Masaaki
scheme or table, p. 5277 - 5280 (2010/11/03)
A convenient one-pot synthesis of [1]benzothieno[3,2-b]benzothiophene from readily available o-dihalostilbenes using combined reagents of sodium sulfide nonahydrate (Na2S·9H2O) or sodium hydrosulfide hydrate (NaSH·nH2O) and sulfur is described along with plausible reaction paths in this intriguing reaction.
