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The branching in 2-ethyl-1-butanol makes it harder to crystallize due to packing disruption, which results in a very low freezing point. Esters of 2-ethyl-1-butanol are similarly effected and it therefore finds application as a feedstock in the production of plasticizers and lubricants, where its presence helps reduce viscosity and lower freezing points.
For spectra recorded in the Nicolet spectrometer, the data were stored at intervals of 0.5 cm −1 in the 4,000 – 2,000 cm −1 region and of 0.25 cm −1 in the 2,000 – 400 cm −1 region and the spectral resolution was 0.25 cm −1. For spectra recorded in the JASCO spectrometer, the resolution as well as the intervals was 0.5 cm −1.
SDBS includes 14700 1 H NMR spectra and 13000 13 C NMR spectra as well as FT-IR, Raman, ESR, and MS data. The data are stored and displayed as an image of the processed data. Annotation is achieved by a list of the chemical shifts correlated to letters which are also used to label a molecular line drawing.
tert-Amyl alcohol (TAA) or 2-methylbutan-2-ol (2M2B), is a branched pentanol. Historically, TAA has been used as an anesthetic [ 3 ] and more recently as a recreational drug . [ 4 ] TAA is mostly a positive allosteric modulator for GABA A receptors in the same way as ethanol . [ 5 ]
1 H NMR spectrum predicted for 1,4-dimethylbenzene. Under ideal conditions, the ratio of integrated signal of protons A and B is related to the structure of this molecule. The integrated intensities of NMR signals are, ideally, proportional to the ratio of the nuclei within the molecule. [4]
Mosher's acid contains a -CF 3 group, so if the adduct has no other fluorine atoms, the 19 F NMR of a racemic mixture shows just two peaks, one for each stereoisomer. As with NMR spectroscopy in general, good resolution requires a high signal-to-noise ratio , clear separation between peaks for each stereoisomer, and narrow line width for each peak.
1-pentanol or normal amyl alcohol primary Pentan-1-ol: 138.5 2-methyl-1-butanol or active amyl alcohol primary 2-Methylbutan-1-ol: 128.7 3-methyl-1-butanol or isoamyl alcohol or isopentyl alcohol primary 3-Methylbutan-1-ol: 131.2 2,2-dimethyl-1-propanol or neopentyl alcohol primary 2,2-Dimethylpropan-1-ol: 113.1 2-pentanol or sec-amyl alcohol
32.2 kJ/mol Std entropy change of vaporization, Δ vap S o: 91.6 J/(mol·K) Solid properties Std enthalpy change of formation, Δ f H o solid? kJ/mol Standard molar entropy, S o solid? J/(mol K) Heat capacity, c p? J/(mol K) Liquid properties Std enthalpy change of formation, Δ f H o liquid –273.3 kJ/mol Standard molar entropy, S o liquid ...