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128787-41-7

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128787-41-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128787-41-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,7,8 and 7 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 128787-41:
(8*1)+(7*2)+(6*8)+(5*7)+(4*8)+(3*7)+(2*4)+(1*1)=167
167 % 10 = 7
So 128787-41-7 is a valid CAS Registry Number.

128787-41-7Relevant articles and documents

Synthesis of 2-fluoro-3-phenylthio-1,3-butadiene and 2-trifluoromethyl-3- phenylthio1,3-butadiene and their reactivities toward various dienophiles

Paul, Kamaldeep,Hwang, Ji Hye,Choi, Ji Hoon,Jeong, In Howa

supporting information; experimental part, p. 4728 - 4731 (2009/12/07)

A general approach for the synthesis of novel 2-fluoro-3-phenylthio-1,3- butadiene (8) and 2-trlfluoromethyl-3-phenylthlo-1,3-butadiene (9) from monobromoalkene and dibromoalkenes has been developed. Subsequent Dlels-Alder reactions of these dienes with s

ELECTROPHILIC ADDITION OF 4'-NITROBENZENESULPHENANILIDE TO ALKYNES, EFFECTS OF ARYL AND ALKYL SUBSTITUENTS AT RING CARBONS OF INTERMEDIATE THIIRENIUM IONS

Benati, Luisa,Montevecchi, Pier Carlo,Spagnolo, Piero

, p. 609 - 616 (2007/10/02)

The BF3-promoted addition of 4'-nitrobenzenesulphenanilide, NBSA, to a number of aryl- and alkyl-acetylenes has been investigated in dichloromethane, p-xylene and/or benzene.Diphenylacetylene, 1a, 1-phenylbutyne, 1b, and 1-phenylpropyne, 1c, generally lead to 1,2-bis(phenylthio)alkenes 4a-c, and N-(4-nitrophenyl)-S-phenyl-S-(2-phenylthiovinyl)sulphimides, 6a-c, in fair to good yields with trans stereospecificity.Phenylacetylene, 1d, similarly gives the corresponding bis(phenylthio)adduct 4d and sulphimide 6d in dichloromethane, but in the aromatic solvents these products are essentially suppressed in favour of 1-aryl-1-phenyl-2-(phenylthio)ethylenes 7d.On the other hand, alkyl- and, particularly, dialkyl-substituted acetylenes preferentially afford β-fluorovinyl sulphides, 5, with trans stereospecifity.These findings are interpreted in terms of a different reactivity towards nucleophilic attack of the intermediate aryl- and alkyl-trihirenium ions which would result from electrophilic sulphenylation of the corresponding alkynes.Steric effects of the substituents are believed to play a major role in determining the different reactivity observed.

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