Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH₃OCHD₂)

Gas-phase formation of doubly-deuterated species

We present the first results from a time-dependent chemical model to include a gas-phase reaction scheme for producing doubly-deuterated species. Under normal conditions the formation of these species is inefficient. However, when the effects of the freeze out of gas phase species onto grains is included in the chemistry we find that the fractionation of both singly and doubly deuterated specie...

The Rotational-torsional Spectrum of Methyl Formate:precise Measurements on and In- Terpretation of Millimetric Wave Transitions

Ab Initio Study of the Rotational-torsional Spectrum of Methyl Formate

The molecular structure of methyl formate is determined from ab initio calculations. The molecule presents two conformers (cis and trans) with a 5.3 kcal mol 1 difference in energy. In the most stable cis conformer, the carbonyl group eclipses the methyl group. The internal rotation barriers are V3(cis) 1⁄4 368 cm 1 and V3(trans) 1⁄4 26 cm 1 for the methyl group and V CO 1⁄4 4826 cm 1 for the C...

A short synthesis of (±)-cherylline dimethyl ether

A synthesis of ±-cherylline dimethyl ether is reported. The key steps involved are Michael-type addition, radical azidonation of an aldehyde, Curtius rearrangement, and reduction of an isocyanate intermediate followed by Pictet-Spengler cyclization.

Rotational spectrum of tryptophan.

The rotational spectrum of the natural amino acid tryptophan has been observed for the first time using a combination of laser ablation, molecular beams, and Fourier transform microwave spectroscopy. Independent analysis of the rotational spectra of individual conformers has conducted to a definitive identification of two different conformers of tryptophan, with one of the observed conformers n...