The structure of regalamine
SummaryOn the basis of UV, IR, NMR, and mass spectra and chemical transformations the structure of 11,12-dihydroxy-2-methoxy-1,12-epoxyhexahydrohomoproaporphine has been proposed for regalamine.
Alkaloids from croton species. VI. Mass spectrometric studies of the crotonosine alkaloids.
The mass spectra of crotonosine and some related compounds are reported and the composition of the major fragments determined by high-resolution mass measurements. Modes of fragmentation are discussed. In addition the mass spectra of the model compound tetrahydroisoquinoline and its N-methyl and N-acetyl derivatives are reported and discussed.
Carbon Dioxide Elimination from Circle Systems
Ten various circle systems were studied in model experiments. All the experiments were performed using a Waters cannister containing 675–685 g of Durasorbr̀. 300 ml of carbon dioxide were supplied to the system per min. The efficacy of these systems was expressed as the time taken to demonstrate a concentration of 0.6% carbon dioxide in the gas mixture supplied to the patient connection during each respiratory cycle. The carbon dioxide elimination was studied at a gas flow of 2, 4 and 6 1 per min. All the systems showed an effective carbon dioxide elimination for 6 h or more at a flow of 2 1. An increasing efficacy was found with increasing flow, but to a varying extent.