Search

Your search keyword '"Egert E"' showing total 179 results
Start Over Author "Egert E"
179 results on '"Egert E"'

9. ChemInform Abstract: Synthesis of the Macrolide Antibiotic (-)-A26771B Using Photolactonization as a Key Reaction and Computer Simulation as an Effective Aid in Optimization.

Author

QUINKERT, G., primary, KUEBER, F., additional, KNAUF, W., additional, WACKER, M., additional, KOCH, U., additional, BECKER, H., additional, NESTLER, H. P., additional, DUERNER, G., additional, ZIMMERMANN, G., additional, BATS, J. W., additional, and EGERT, E., additional

Published
2010
Full Text
View/download PDF

18. The San Cristobal gold district, Antofagasta, Chile.

Author

Egert E., 1995 PACRIM Congress Auckland 19-Nov-9522-Nov-95, Kasaneva S., Egert E., 1995 PACRIM Congress Auckland 19-Nov-9522-Nov-95, and Kasaneva S.

Abstract

The gold district contains the San Cristobal gold mine which has initial reserves of 10 100 000 tonnes grading 1.34 g/tonne Au; Niugini Mining commenced a heap leach operation in December 1990. The main mineralisation occurs within a NW trending subvertical zone, containing rhyolite porphyry and minor breccia, within an Upper Cretaceous-Lower Tertiary magmatic arc. At the San Cristobal mine, most gold mineralisation occurs in subvertical quartz-pyrite veins which were emplaced in dilational sections of an imbricate fault system. The bulk gold resources comprise 4 ore shoots which formed where the vein system intersects the subvolcanic complex. Gold-bearing quartz-pyrite veins also occur at the Three Sisters and Sol prospects, W and S of the mine. Hydrothermal alteration is overprinted by a phyllic stage, associated with the emplacement of the veins. The deposit is classed as a porphyry-related, mesothermal quartz-vein system of the low sulphidation type., The gold district contains the San Cristobal gold mine which has initial reserves of 10 100 000 tonnes grading 1.34 g/tonne Au; Niugini Mining commenced a heap leach operation in December 1990. The main mineralisation occurs within a NW trending subvertical zone, containing rhyolite porphyry and minor breccia, within an Upper Cretaceous-Lower Tertiary magmatic arc. At the San Cristobal mine, most gold mineralisation occurs in subvertical quartz-pyrite veins which were emplaced in dilational sections of an imbricate fault system. The bulk gold resources comprise 4 ore shoots which formed where the vein system intersects the subvolcanic complex. Gold-bearing quartz-pyrite veins also occur at the Three Sisters and Sol prospects, W and S of the mine. Hydrothermal alteration is overprinted by a phyllic stage, associated with the emplacement of the veins. The deposit is classed as a porphyry-related, mesothermal quartz-vein system of the low sulphidation type.

Published
1995

37. Molecular Structure of p-Cyclohexylaniline. Comparison of Results Obtained by X-ray Diffraction with Gas Phase Laser Experiments and ab Initio Calculations

Author

Riehn, C., Degen, A., Weichert, A., Bolte, M., Egert, E., Brutschy, B., Tarakeshwar, P., and Kim, K. S.

Abstract

The results of a combined experimental and theoretical investigation of the molecular structure of p-cyclohexylaniline (pCHA) in the electronic ground and the first electronically excited state are reported. The experimental investigations are performed for the crystalline phase by X-ray diffraction for the first time and related to former gas phase results obtained by time-resolved rotational laser spectroscopy. The theoretical results, from new ab initio calculations at the MP2/6-31+G(d) and CIS/6-31+G(d) level of theory for the electronic ground and excited state, respectively, give an adequate description of the rotational constants as obtained by the gas phase experiments. Thus, a detailed comparison of the ab initio structure for the ground state with the X-ray structure is performed in order to ascertain differences in the molecular geometry between the gas and crystalline phase. In particular, the size of the aromatic and cyclohexyl ring, their mutual orientation, and the conformation of the NH2 group are affected. The latter can be ascribed to intermolecular hydrogen bonding forming chainlike structures in the crystalline phase. Moreover, the results of the ab initio calculations allow for a discussion of the structural changes of pCHA upon photoexcitation in the gas phase.

Published
2000

Catalog

Books, media, physical & digital resources
See catalog results