sing the IR with the sodium borohydride reaction, how can you tell f the startin
ID: 589890 • Letter: S
Question
sing the IR with the sodium borohydride reaction, how can you tell f the starting C-O has completely reacted to give an alcohol? What peak(s) would appear or disappear between the starting material and the product? b) Using the IR with the Wittig reaction, how can you tell if the starting C-O has completely reacted to give an alkene? What peakfs) would appear or disappear between the starting material and the product? c) Using the 'H NMR, how can you tellif you got a cis or a trans double bond in a particular Wittig reaction? You don't have to give specific numbers; you can speak in general terms.Explanation / Answer
A. Before the reaction with NaBH4 we will observe a peak at 1710 for C=O which disappear after the reaction and a peak appears at 3330 which is due to OH stretch
B. Before the reaction with Wittig reagent we will observe a peak at 1710 for carbonyl group which disappear after the reaction and we will observe new peaks at 3080 & 1610 for =CH & C=C.
C. For trans double bond coupling constant value is more than cis double bond.
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