Eine neue M?glichkeit zur Bestimmung von Kakaoabfall-Extraktionsfetten neben Kakaopre?fetten

Ohne Zusammenfassung     

Inactivation of Photosensitizing Merocyanine Dyes by Plasma, Serum and Serum Components

Abstract— Merocyanine dyes with an oxygen in the electron donor heterocycle were rapidly degraded by plasma, serum and serum components. Replacement of the oxygen by a sulfur or selenium atom rendered the dyes refractory to degradation. The degradation of labile merocyanine dyes was temperature dependent and oxygen independent. The plasma component that was responsible for the degradation of merocyanine dyes was sensitive to heat and detergent, suggesting an enzymatic process. The identification of the structural requirements for sensitivity/resistance to degradation provides the experimenter with a simple means to manipulate the stability of mer-ocyanines in high serum or plasma environments and may expand the clinical utility of merocyanine photosen-sitizers beyond their traditional role in the extracorporeal purging of bone marrow grafts.     

Eichinvariante Berechnung des Diamagnetismus und der chemischen Verschiebung

The procedure described in^1,2 was used to calculate the magnetic susceptibility contributions of C-H bonds to the diamagnetism of various hydrocarbons. It was found a correlation between these C-H-bond contributions and the bond lengths. The transferability of the evaluated C-H-bond susceptibilities from one molecule to another is discussed.

     

TiOBr; Darstellung,Eigenschaften und Struktur*

TiOBr was prepared by reaction of Ti with TiO₂ and Br₂. The compound forms fiat reddish-brown needles and shows a temperature independent weak paramagnetism. It crystallises in the orthorhombic system (Pmmn; a = 3.787, b = 3.487, c = 8.529 Å) with the FeOCl type of structure. The interatomic distances are Ti?O = 1.952; 2.245 Å (2X) and Ti?Br = 2.544 Å (2X).     

α-substituent effects in 13C NMR of hydrocarbons. Quantum chemical calculations

The ¹³C NMR α-substituent effects within the series methane to neopentane and ethene to isobutene have been calculated using Hartree—Fock perturbation theory with MINDO/3. The sign and order of magnitude of the calculated α-effects are in agreement with new experimental values, including effects of multiple substitution.