An infrared investigation of Pyrrolidine-2-thione and -2-selenone
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Pyrrolidine-2-thione and -2-selenone together with their N-deutero and S- and Se-methiodide derivatives have been studied by i.r. spectroscopy over the range 4000-200 cm-1. C=S and C=Se contribute to the bands at around 1000 cm-1 and below 600 cm-1. In pyrrolidine-2-selenone, the band at 1005 cm-1 has been attributed to v(CSe). This value is the highest wave number for all similar pentaatomic rings, which we have previously investigated, and indicates a greater double-bond character in CSe. In the low-frequency region two bands at 497 and 334 cm-1 in pyrrolidine-2- thione and two others at 352 and 280 cm-1 in the selenium analogue are undoubtedly attributable to the C=S and C=Se modes respectively.
2015 ◽
Vol 71
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pp. o1086-o1087
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2012 ◽
Vol 68
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pp. o1812-o1812
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1955 ◽
Vol 23
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pp. 2068-2073
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1960 ◽
Vol 82
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pp. 5057-5063
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2015 ◽
Vol 71
(12)
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pp. o984-o985
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2015 ◽
Vol 71
(12)
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pp. o1045-o1046
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