Cyclopolymerization. II. Polyacrylic anhydride (J. Polymer Science, 33, 15–20, 1958)

Structure of difructose anhydride II.

The difructose anhydrides include four welldefined crystalline sugars. Diheterolevulosan was first prepared by Pictet and Chavan [1]l by the action of concentrated hydrochloric acid on fructose at 0° C. This sugar is a difructopyranose in which carbon atoms 1 and 2 of each fructose residue are joined to form a dioxane ring. The other members [2,3] of this group arc designated difructose anhydri...

Cyclopolymerization of Conjugated Dienes

The formation of essentially saturated polymers containing fused cyclohexane rings is a characteristic of the polymerization of conjugated dienes under the influence of all cationic or Lewis acid catalysts. The amount of cyclic structures and non-terminal linear unsaturation is dependent upon the electron accepting ability of the catalyst, which may be greatly influenced by the nature of the so...

Invasion biology 1958-2005: the pursuit of science and conservation

Invasion Biology 1958-2004: The Pursuit of Science and Conservation

Electromagnetic decay of ( 1520 )

The electromagnetic decay processes of excited hyperon states are a very sensitive probe of the structure of hyperons. We will argue that the recent measurements of electromagnetic decay rates indicate that the wave functions of the hyperon ground states should contain sizable components of excited quark states (configuration mixing). Flavor-SU(3) is a broken symmetry and it appears that the hy...