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Proton magnetic resonance spectra of thenyl derivatives—II. Chloromethylthiophenes and some dithienylmethanes

✍ Scribed by Tyo Sone; Kensuke Takahashi

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
265 KB
Volume
3
Category
Article
ISSN
0749-1581

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✦ Synopsis

PMR spectra of thirty-eight chloromethylthiopliene and seven dithienylmethane derivatives were observed at 60 or 40 MHz. The cheniical shifts of methylene protons were 4-63 to 5.25 ppni for monosubstituted 2-chloromethylthiophenes and 4.37 to 4.56 ppm for inonosubstittited 3-chloromethylthiophenes, respectively, with reference to TMS. Those for 2,2'-dithienylmethanes, which have one substituent in each ring, were 4.12 to 4.34 ppm. These shifts are useful for detcrmination of the positions of the methylenc groups in the related compounds. The long-range coupling constants observed for methylene proton signals are also useful for the determination of the positions of substituents.

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