Chemistry is traditionally divided into organic and inorganic chemistry. SDS of cas: 453-20-3, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 453-20-3
The pure rotational spectra of succinic, itaconic, and methylsuccinic anhydrides were collected in the region of 7?18 GHz using Fourier transform microwave spectroscopy. Each molecule shows varying degrees of puckering, demonstrating the effects of substitution on torsional and bond angle strain. The spectra of all three molecules exhibit perturbations consistent with internal motion; succinic and itaconic anhydride display pseudorotational motion (DeltaE = 0.1 cm?1 and 0.2 cm?1, respectively), while methylsuccinic anhydride shows two uncoupled vibrations (DeltaE01 = 0.4 cm?1 and DeltaE02 = 1.2 cm?1). Analyses of similar five-membered rings demonstrate the relationship between the planarity of the ring and the barrier to pseudorotation.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem