LXX.—Studies on optically active carbimides. Part I

Active chronic hepatitis. Part I.

IN 1950 Waldenstrom first drew attention to the occurrence of a form of chronic liver disease in young people, predominantly adolescent girls, in whom there was moderate jaundice, enlargement of the liver and spleen, acne, amenorrhoea and hyperglobulinaemia. The occurrence of fever, arthralgia and Cushingoid features was noted (Kunkel et al 1951, Beam et al 1956), the LE cell phenomenon was rep...

Optically Active Coordination Compounds. Part 50.' 4-Fold Symmetry Axes in Optically Active Complex Ions from Natural Nicotine

Optically driven oscillations of ellipsoidal particles. Part I: experimental observations.

We report experimental observations of the mechanical effects of light on ellipsoidal micrometre-sized dielectric particles, in water as the continuous medium. The particles, made of polystyrene, have shapes varying between near disk-like (aspect ratio k = 0.2) to very elongated needle-like (k = 8). Rather than the very tightly focused beam geometry of optical tweezers, we use a moderately focu...

Are lignins optically active?

The accepted derivation of lignins from non(enzymatically)-controlled radical coupling reactions has been recently challenged, and it is relevant to ascertain unequivocally whether lignins are or are not (as normally assumed) optically active. Two approaches were used. First, DFRC (derivatization followed by reductive cleavage) dimers derived from beta-5- and beta-beta-units in pine lignins, wh...

Optically active diaryl tetrahydroisoquinoline derivatives.

In (1R,3S)-6,7-dimethoxy-3-(methoxydiphenylmethyl)-1-phenyl-1,2,3,4-tetrahydroisoquinoline, C(31)H(31)NO(3), (I), and (1R,3S)-2-benzyl-3-[diphenyl(trimethylsiloxy)methyl]-6,7-dimethoxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline, C(40)H(43)NO(3)Si, (II), the absolute configurations have been confirmed to be R and S at the isoquinoline 1- and 3-positions, respectively, by NMR spectroscopy experiment...