B. De Clercq

Kharasch Addition and Vinylation Reactions Mediated by Ruthenium(II) Complexes Bearing Schiff Base Ligands

Ruthenium Schiff base complexes I.a-f mediated the Kharasch addition of carbon tetrachloride across olefins with high yields which markedly depended on the catalyst and the substrate used. Furthermore, 1,6-dienes undergo a highly stereoselective addition–cyclization process with these systems to give mixtures of cis- and trans-3-chloromethyl-4-(2,2,2-trichloroethyl)cyclopentanes in excellent yields. Finally, the catalytic performance of these systems in the vinylation reaction was checked. Dependent on the catalytic system and the reaction conditions used, enol esters or enynes can be obtained in high yields with moderate selectivities.

Developmental Manifestations of Borderline Personality Pathology from an Age-Specific Dimensional Personality Disorder Trait Framework

The current chapter addresses the description of the childhood borderline construct from a child-specific and comprehensive maladaptive trait framework (i.e. the Dimensional Personality Symptom Itempool, De Clercq, et al., 2006), relying on three different samples and applying a multi-informant design. From cross-sectional and longitudinal associations between early maladaptive traits and various operationalizations of the adult borderline construct, we propose a set of childhood maladaptive traits that can be assumed relevant descriptors of borderline-related pathology at a young age. Delineating such childhood borderline trait profile may contribute to the dimensional assessment of childhood psychopathology and creates avenues for future research that focuses on the etiological roots of borderline personality disorder and require age-specific measures of personality disorders.

Hydraulic Characterization Of A Wastewater Treatment Clarifier By An Acoustic Doppler Current Profiler

Optimization of the solids removal performance of a clarifier requires, in part, a complete understanding of the tank hydraulics. This paper presents velocity measurements obtained by utilizing an acoustic doppler current profiler (ADCP). The latter provides the necessary temporal and spatial scale to understand and analyze in a detailed way density-driven flows in wastewater clarifiers. Velocity profiles and Reynolds shear stresses of a full-scale installation were investigated. Two different clarifiers were investigated that differ in floor slopes and solids removal mechanisms. The ADCP revealed that sloped clarifiers provide significant solids transport towards the central removal sump. Implications in the design of clarifiers are discussed and new insight is provided into the transport of solids and purpose of the solids removal system. The velocity measurements suggest that the analysis of the removal mechanism should be considered from a fluid mechanical perspective. It was also seen that a scraper-equipped, central solids removal design creates non-ideal flow fields compared with a suction, radial removal design. Shear stress corresponded well with simulation results from literature. The paper has to be seen as a first attempt to apply this proven measurement technology in wastewater treatment.

Integrating developmental aspects in current thinking about personality pathology

The current review outlines some recent highlights from the developmental literature on personality pathology with regard to its conceptualization, development, assessment and clinical utility. Notable parallels with adult evidence are described, but also unique and age-specific issues are discussed. Finally, suggestions for future research that may stimulate a life-span and integrative perspective on personality pathology from childhood onwards are proposed.

Heterogenation of a shiff base substituted Grubbs catalyst and a Ru-dimer to perform romp reactions

The investigation of hybrid catalysts has been driven by the vision of combining the positive aspects of a homogeneous catalyst (i.e. site homogeneity, high activity per site, high selectivity and reproducibility) with those of heterogeneous catalysts (long life time, ease of separation, continuous operation). With the invention of MCM mesoporous silica, a new generation of improved supports for covalent binding of complexes became available. Such silica’s not only show regular mesopores with variable size but also have very reactive intraparticle siloxane bridges and silanol groups for covalent linking of metal complexes. The reaction of the intraparticle surface of mesoporous silica with organosilicon spacers has recently proven to be a very flexible surface functionalisation technique. Here we present the immobilisation of [RuCl2(p-cymene)]2 on phosphine modified MCM-41 and of a Shiff base substituted Grubbs catalyst on MCM-41. Besides the synthesis and characterisation of the catalysts, results on ROMP reactions are presented.