Aliphatic Part Research Articles

Infra-red spectra of some organic sulphur-oxygen compounds

Infra-red spectra were obtained from anhydrous and hydrated sulphonic acids, as well as of the deuterated benzenesulphonic acid. Following assignments of bands characteristic of the sulphonic acid group are proposed: ν(OH) 2900 and 2350 cm 1, ν a (SO 2) 1350 cm 1, ν s (SO 2) 1160 cm 1, ν(SO) 900 cm 1, with very small deviations. The spectra of hydrated sulphonic acids are interpreted in terms of superposition of the spectra of the SO 3 group and the H 3O + ion. The positions of the ν a (SO 2) and the ν s (SO 2) bands in sulphonic acids and their derivatives are briefly discussed. The bands due to the stretching of the single S-O bonds in aliphatic sulphites were found to appear between 690 and 760 cm 1 whereas the analogous bands in the spectra of the corresponding sulphates were found at slightly higher frequencies, but were difficult to separate from the bands due to the aliphatic part of the molecule.

Chemical composition ofCalotropis gigantea

The ligroin extract of the flowers yielded waxy matter. One fraction of it consisted mainly of the esters of the resinols, α- and β-calotropeols and β-amyrin, with volatile as well as long chain fatty acids. There was also some sterol. The non-resinol aliphatic part contained mainly esters of wax acids and alcohols. The alcoholic extract of the wax-free flowers yielded only mineral matter—citrates, chlorides and tartrates of sodium and potassium.

Studies on sesamine II

AbstractThrough careful degradation of dibromosesamine it has been possible to divest the sesamine‐molecule of its aromatic portion and a compound has been isolated, although in a small yield, which can be considered as the double cyclic acetal of 3.4‐dihydroxyhexane‐ 1.6‐di‐al. As a result, the structural formula of sesamine formerly proposed, which was still somewhat ambiguous, especially as regards the aliphatic part of the molecule, now becomes more probable.