Building a cylinder in the topological expansion

Usual cylinder construction neglect planar analyticity and the resulting cylinder is contaminated by j-plane cuts. Beginning with input planar amplitudes that are manifestly consistent with a pole-to-pole planar bootstrap, a three-dimensional cylinder equation is formulated, incorporating planar analyticity. The output cylinder is now free of j-plane cuts. The bare pomeron is a simple pole with trajectory intercept slightly above one.     

Structural relationships between the orientationally disordered (plastic) and ordered phases of tetrahedral molecules

A systematic study of the crystal structures of both the plastic and ordered phases of a number of pseudo-spherical tetrahedral molecules has revealed some generalized relationships which apply to all the molecular crystals studied, including those which exhibit significant hydrogen bonding. The following rule is proposed: equal-sphere closest-packing principles control the crystal structures of both orientationally-disordered and ordered phases of tetrahedral, pseudo-spherical molecules.     

Novel Product Chemistry from Mechanistic Analysis of ent‐Copalyl Diphosphate Synthases from Plant Hormone Biosynthesis

An active‐site water molecule coordinated by conserved histidine and asparagine residues seems to serve as the catalytic base in all ent‐copalyl diphosphate synthases (CPSs). When these residues are substituted by alanine, the mutant CPSs produce stereochemically novel ent‐8‐hydroxy‐CPP. Given the requisite presence of CPSs in all land plants for gibberellin phytohormone biosynthesis, such plasticity presumably underlies the observed extensive diversification of the resulting labdane‐related diterpenoids.     

Direct Formation and Reactions of Allylic Thienyl-Based Organocopper Reagents

The lithium naphthalenide reduction of lithium 2-thienylcyanocuprate produces a highly reactive zero-valent copper complex. This allows for the direct formation of allylic organocopper reagents and ensuing cross-couplings with electrophiles.     

Travelling wave in the chlorite-thiourea reaction

The oxidation of thiourea by chlorite within the pH range of 2 to 5.5 has been found to produce a single wave of chlorine dioxide in unstirred solutions. The wave has been studied in narrow tubes of varying diameters and in petri dishes. The wave appears after an induction period that depends on the acid concentration, the [ClO₂^?]/[CS(NH₂)₂] ratio, the temperature, and the diameter of the tube. The wave starts from the surface in a tube and from the edges in a petri dish. The rate of wave movement is proportional to the ratio and the acid concentration. Barium chloride and starch were used as indicators. The wave could be initiated electrochemically and by addition of a drop of solution containing chlorine dioxide. The chlorine dioxide is produced by the oxidation of chlorite by hypochlorous acid.