Asymmetric synthesis of 1,2-disubstituted cycloalkanecarboxaldehydes. procedures for the highly stereoselective preparation of cis- and trans-isomer

Procedures for the asymmetric synthesis of 1,2-disubstituted cycloalkanecarboxaldehydes ($\text{7}$) having assymetric tertiary and quaternary carbon atoms in vicinal positions from the corresponding cycloalkenecarboxaldehydes ($\text{2}$) in high diastereomeric and enantiomeric purities are described.     

Asymmetric total synthesis of optically active α-curcumene

(R)-(?)-α-Curcumene has been prepared in 66% optical yield and in 34% overall yield in five steps by means of asymmetric Grignard cross-coupling reaction catalyzed by a nickel complex of chiral (aminoalkylferrocenyl)phosphine as a key carbon-carbon bond forming step.     

High energy 2H(α, αp)n reaction

The ²H(α, αp)n reactions at 78.3 and 165 MeV lab energy are analysed by the semi-phenomenological method which was introduced in a previous paper. The same parameter set is adopted for both the 78.3 and 165 MeV cases. The agreement with data is excellent, as well as in low energy cases. The results indicate strongly that the even parity (D- and G-waves) reactions are very strong while the odd parity (P- and F-waves) ones are definitely weak.     

X-ray crystal structure of a thiabenzene derivative

The first success of an X-ray analysis of a thiabenzene derivative, 1-benzoyl-2-methyl-2-thianaphthalene is described.     

Caesium-selective PVC membrane electrodes based on bis(crown ether)s

Caesium-selective PVC membrane electrodes based on bis(crown ether)s containing benzo-18-crown-6 moieties were prepared using two kinds of plasticizers. Selectivity coefficients for various interfering monovalent ions were determined by the mixed solution method, and were found to relfect the complexing property and extractability of the bis-(benzo-18-crown-6)s. The electrochemical selectivity was also compared with that of the corresponding monocyclic analog and valinomycin.