ETHER versus CYCLOPROPANE

Cyclopropane Anæsthesia

TLHIS paper is based on my experience of one thousand cases of cyclopropane anaesthesia personally conducted by me since October, 1938, both in hospital and in private. But before discussing these it might be convenient for me to mention here something about the drug itself. HISTORY. Cyclopropane was first isolated in Germany in 1882 by Freund, who also demonstrated its chemical structure, C 3H...

Cyclopropane Anesthesia

Biosynthesis of Cyclopropane Compounds

Oleic acid was converted to dihydrosterculic acid (9,10methyleneoctadecanoic acid) by Lactobacillus arabinosus cells. This was established by the mass spectra of branched chain esters formed by reductive opening of the cyclopropane ring of the corresponding cyclopropane fatty esters. The mass spectra allowed unambiguous assignment of the ring location to position 9,10. Oleic acid-9,10-d2 was co...

Biosynthesis of Cyclopropane Compounds

Several natural and synthetic phospholipids can serve as substrates for the cyclopropane synthetase enzyme of Closfridium bufyricum. The conditions for optimum substrate effectiveness vary with the substrate; e.g. an anionic surfaceactive agent is necessary with phosphatidylethanolamine, while divalent cations stimulate the rate of reaction with anionic phospholipids. These variable conditions ...

Hyperconjugation in diethyl ether cation versus diethyl sulfide cation.

Ionization of a molecule can greatly alter its electronic structure as well as its geometric structure. In this collaborative experimental and theoretical study, we examined variance in hyperconjugation upon ionization of diethyl ether (DEE) and diethyl sulfide (DES). We obtained the experimental gas phase vibrational spectra of DEE, DES, DEE(+), DES(+), DEE(+)-Ar, and DES(+)-Ar in the wavenumb...