Now showing items 101-110 of 426
Preparation of highly functionalized 3,4-disubstituted cyclobutene-1,2-diones using functionalized zinc-copper organometallics
(Elsevier, 1992)
The selective substitution reactions of the zinc-copper reagents with 3,4-dichlorocyclobutene-1,2-dione 2 allows to prepare a variety of new functionalized symmetrical and mixed 2,4-disubstituted cyclobutene-1,2-diones of ...
Surface complexation models: An evaluation of model parameter estimation using FITEQL and oxide mineral titration data
(Elsevier, 1991-03-15)
The ability of surface complexation models (SCMs) to fit sets of titration data as a function of changes in model parameters was evaluated using FITEQL and acid-base titration data of [alpha]-FeOOH, [alpha]-Al2O3, and TiO2. ...
Monte Carlo simulation of the adsorption of co on pt(111): thermodynamic considerations for the surface configuration of adsorbed species
(Elsevier, 1991-02-02)
We have developed a "two-site" lattice gas model which provides a theoretical framework for understanding adsorption equilibrium in systems for which the potential energy surface is inherently heterogeneous in terms of ...
GermylenÜbergangsmetallkomplexe als Hydrierkatalysatoren: Synthese eines Bis(amino)germans Diese Arbeit wurde von der University of Michigan gefÖrdert. Die Autoren danken der Firma Alfa-Aesar fÜr eine großzÜgige Spende an [K 2 PtCl 4 ]. J. E. B. dankt der National Science Foundation fÜr ein Graduiertenstipendium.
(WILEY-VCH Verlag GmbH, 1997-03-03)
No Abstract.
Synthesis and characterization of cage and bicyclic silsesquioxanes via dehydration of silanols
(John Wiley & Sons, Ltd., 1999-04)
Synthesis of cage and ladder silsesquioxanes by the dehydration of silanols using dicyclohexylcarbodiimide (DCC) is described. The reaction of 1,3-dicyclohexyldisiloxane-1,1,3,3-tetraol with DCC gave octa(cyclohexylsilsesquioxane) ...
cis-2-Tri-n-butylstannylvinyl cuprates: a new synthon for the cis-1,2-ethene dianion
(Elsevier, 1992-01-01)
Conjugate additions of lower order and higher order cyano cuprates containing the cis-2-tri-n-butylstannylvinyl group to cycloalkenones have been studied. The higher order cuprates were more reactive towards hindered enones ...
Conformational studies of human islet amyloid peptide using molecular dynamics and simulated annealing methods
(Wiley Subscription Services, Inc., A Wiley Company, 1998-01)
Molecular dynamics simulations and simulated annealing in vacuum, model aqueous solution, and simulated membrane were used to analyze the conformational preferences of a segment spanning 20–29 residues of human islet amyloid ...
The reaction of sulfur with dilithio compounds. The syntheses and structures of phenanthro [1, 10-cd]-1,2-dithiole and phenanthro[4,5-cde] [1,2]dithiin
(VCH Publishers, Inc.Wiley Periodiocals, Inc., 1994-04)
The sequential reaction of selected polycyclic aromatic hydrocarbons with butyllithium/TMEDA/hexane and sulfur allows preparation of ring-fused dithiins, dithioles, and thiophenes. In this manner, phenanthrene has been ...
Vacancy Generation During Grain Boundary Migration
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-12)
We present a molecular dynamics simulation study of vacancy generation and emission from grain boundaries during curvature-driven grain boundary migration. The U-shaped half-loop bicrystal geometry is employed in order to ...
Searching for foldable protein structures using optimized energy functions
(Wiley Subscription Services, Inc., A Wiley Company, 1995-07)
During evolution, the effective interactions between residues in a protein can be adjusted through mutations to allow the protein to fold to its native structure on an adequate time scale. We seek to address the question: ...