AbstractWhen a gaseous component is absorbed by a liquid under simultaneous
reaction with a component of the liquid, the overall rate of reaction proves to
be a dimensionless function of four limiting rates: the maximum rate of
diffusion of the gaseous component through the liquid film the maximum rate of
diffusion of the liquid‐component through the liquid film the limiting rate of
reaction withi... hiện toàn bộ
AbstractCyclometallated compounds, obtained by direct intramolecular C–H
activation of a ligand by transition metals, are fairly reactive [especially
those derived from palladium(II)] towards insertion of internal alkynes into
their metal‐carbon bond. This reaction leads to either new organometallic
compounds by inclusion of one to three alkynes into the M‐C bond, or organic
compounds which are ei... hiện toàn bộ
G. J. Hoijtink, E. de Boer, P. H. van der Meij, W. P. Weijland
AbstractPotentiometric titrations of solutions of various aromatic hydrocarbons
in 1,2‐dimethoxyethane and tetrahydrofuran with a solution of biphenylsodium
have shown chemical reduction to proceed in two stages: equation image The
reduction potentials of the aromatic hydrocarbons, calculated from the
potentiometric curve, are in good agreement with the half‐wave potentials
obtained from polarogra... hiện toàn bộ
AbstractGas hydrates of nitrogen and oxygen are described.P ‐ t relations of the
three‐phase equilibria in the system nitrogen ‐ water are given from ‐ 4 to 18°C
at pressures up to 1000atm. The dissociation pressure of oxygen hydrate is given
at 0°C.
C.B. Struijk, R. K. Beerthuis, H. J. J. Pabon, D. A. van Dorp
AbstractThe enzyme specificity in the biosynthesis of prostaglandins has been
investigated by incubation of a particulate fraction of sheep vesicular glands
with ω6 tri‐ and tetraenoic C18 ‐ C22 fatty acids and isomers of ω6
eicosatrienoic acid (20: 3 ω6). The chemical synthesis of the various substrate
fatty acids is described. The tetraenoic fatty acids were converted into a
series of prostaglan... hiện toàn bộ
AbstractThe preparation of Tamarindus‐amyloid from seeds of Tamarindus indica L.
is described in detail.The product was homogeneous under conditions of free
boundary electrophoresis and of sedimentation in the ultracentrifuge. A
tentative value for a molecular weight of 115,000 was found.Partial hydrolysis
of the polysaccharide with Myrotheciwn‐cellulase liberated a hepta‐, an octa‐
and a nona‐sac... hiện toàn bộ
AbstractThe heats of combustion, melting points, heats of fusion, boiling
points, refractive indices and in four cases the densities have been determined
on selected samples of the cyclanes with 4 to 9 C‐atoms; some hitherto unknown
transition points were discovered and the heats of transition measured. The
heats of vaporisation at 25° are estimated. Results of the measurements are
discussed.