Push-pull butadienes: evidence for a possible C-H…S hydrogen bond in 4-(methylthio)-4-nitro-1-(pyrrolidin-1-yl)buta-1,3-diene

Abstract

X-Ray crystal structure of 4-(methylthio)-4-nitro-1-(pyrrolidin-1-yl)buta-1,3-diene (2b)+-indicates the presence of a C-H…S hydrogen bond. This might also explain the observed downfield shift of this proton in solution

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