Alumina-accelerated methanolysis and hydrolysis of acyl and phosphoryl fluorides

We have discovered that Woelm chromatographic γ-alumina substantially accelerates hydrolysis (and methanolysis) of acyl and phosphoryl fluorides. Compared to the corresponding $\text{homogeneous}$ reactions, these $\text{heterogeneous}$ alumina-promoted reactions occur about 250–350 times faster for acyl fluorides and about 1800–3000 times faster for phosphoryl fluorides.     

Large perturbative corrections to the Drell-Yan process in QCD

The total cross section $\text{d}\text{σ}\text{d}\text{Q}{}^2$ for the production of a muon pair of invariant mass Q²via the Drell-Yan mechanism and the Feynman x_F differential cross section $\text{d}{}^2\text{σ}\text{d}\text{Q}{}^2\text{d}\text{x}{}_{\mathrm{<mtext>F</mtext>}}$ are calculated in QCD retaining all terms up to order α_s(Q². The calculations are performed using dimensional regularisation of the intermediary infrared and collinear singularities, but we present our results in a form independent of such details. The corrections to both these cross sections coming from radiative corrections to the lowest-order $\text{q}\text{q}$ annihilation diagram are found to be large at present values of Q² and S when the cross section is expressed in terms of parton densities derived from leptonproduction, for all Drell-Yan processes of practical interest. Numerical calculations are presented which show, for any reasonable parametrisation of the parton densities, that the neglect of higher-order terms in α_s(Q²) is not justifiable. The quark-gluon diagrams on the other hand give small corrections in this order and are only important for PP scattering.     

Supersymmetry and non-compact groups in supergravity

We study the interplay of supersymmetry and certain non-compact invariance groups in extended supergravity theories (ESGTs). We use the N = 4 ESGT to demonstrate that these symmetries do not commute and exhibit the infinite-dimensional superinvariance algebra generated by them in the global limit. Using this result, we look for unitary representations of the full algebra. We discuss the implications of our results in the context of attempts to derive a relativistic effective gauge theory of elementary particles interpreted as bound states of the N = 8 ESGT.     

Probing the transverse momentum structure of QCD jets

Large logarithms are resummed to give QCD predictions for the differing transverse momentum structure of quark and gluon jets.     

The peterson reaction,part 1, the effect of reaction conditions and steric crowding

The diastereoisomeric ratio of stilbenes formed in the Peterson reaction of Ph$\text{C}$HSiR₃ with PhCHO is shown to be insensitive to medium effects and temperature, but varies significantly as the bulk of SiR₃ increases.     

A total synthesis of leukotriene F4 (LTF4)

The synthesis of LTF₄ via the reaction of (±)-leukotriene A₄(LTA₄), methyl ester $\text{1}$ with the protected gluramylcysteine $\text{2}$ is reported.     

Direct coupling of glucose oxidase to platinum and possible use forin vivo glucose determination

Glucose oxidase was attached to platinum-platinum oxide screens via alkylamine silaneglutaraldehyde coupling. The amount of immobilized enzyme was equivalent to 0.0031 µg of soluble glucose oxidase per cm² of screen surface. The platinum-silane-glutaraldehydeenzyme screens were tested potentiometrically in buffered glucose solutions, with respect to a Ag/AgCl reference electrode. The results were expressed as the difference in potential for the enzyme screens placed in buffer containing glucose and placed in plain buffer. This difference in potential was related linearily to the logarithm of the glucose concentration over the range 5–150 mg glucose/100 ml. The source of the potential may be due to the decomposition of hydrogen peroxide produced by the glucose oxidase catalyzed oxidation of glucose. The approach is being studied for possible development of an implantable sensor for continuousin vivo monitoring of glucose levels.