The chemistry of Dodonaea SPP—IV : Diterpene and flavonoid components of D. attenuata

Further details are given for the assignment of absolute stereochemistry to the acetoxyhydroxy-acid (1) from D. attenuata and the lactone (6) from the var. linearis. The latter also provided a diene-acid shown to have structure 28. Reductive cyclisation of the tosylate of the latter gives a cyclopropane derivative (31). A flavone from the var. linearis is shown to be 5,7-dihydroxy-3,4′,6-trimethoxyflavone (32).     

Continuous dependence on geometry for the backward heat equation

In this paper we are concerned with the development of criteria for stabilizing inherently unstable initial-boundary value problems under small errors in the geometry of the underlying domain. We consider in particular the initial-boundary-value problem for the backward heat equation assuming that some error has been made in characterizing the geometry of the domain under consideration. It is shown that solutions which belong to an appropriately defined constraint set depend continuously in L₂ on errors in the geometry.     

(II) Infrared and X-ray photoelectron spectroscopy of some transition metal dithiocarbamates and xanthates

Measurements are presented for the binding energy variations of (a) (Ni, Cu) 2p_{$\text{3}\text{2}$}, S 2p and N 1s core levels in a series of Ni and Cu disubstituted dithiocarbamates and (b) (Ni, Cu) 2p_{$\text{3}\text{2}$}, and S 2p core levels in a series of Ni xanthates. These shifts, which are observed to be negative and quite large for the S 2p levels, are then correlated with the infrared absorption frequency variations for the associated intramolecular stretching vibrations of the same series. The results are interpreted in terms of a model based on atomic charges and their potential effects on both variations. The functional relationships between the binding energy and infrared frequency variations are shown to be in good agreement with the experimental results.     

Electrodynamics of rotating superconducting interferometers

Some aspects of the theory of superconductors in noninertial frames are clarified. Interference effects, such as that observed by Zimmerman and Mercereau on rotation of a SQUID, would be destroyed if the apparatus were shielded by a superconducting shell.