Current Organic Chemistry - Volume 8, Issue 7, 2004

Recent applications of theoretical and physical approaches to the elucidation of acyl-transfer mechanisms have led to further clarifications of structures of intermediates and transition states involved in the stepwise reaction paths. Gas-phase acyl-transfer reactions, both experimental and theoretical, are surveyed, in which factors conductive to the stepwise path are discussed. Aminolysis reactions of carbonyl and thiocarb Read More

Predictions of excitation energies of π-conjugated oligomers and band gaps of conducting organic polymers at various theoretical levels are reviewed and compared to experimental data in gas, liquid, and solid phases. High level ab initio calculations reproduce the experimental excitation energies of polyenes in the gas phase very well. The assignment of the peaks to adiabatic and vertical excitations is, however, not certai Read More

The choice of layered phosphates and phosphonates of tetravalent metals, mainly Zr(IV), plays a key role in the success of liquid phase heterogeneous catalysis for the preparation of useful intermediates in organic synthesis. The preparation, the chemical and thermal stability, and the structural aspects of this emerging class of inorganic and inorgano-organic materials will be reviewed with the aim to clarify their po Read More

The review focuses on our results concerning the synthesis of functionalized and simple furyl hydroperoxides and their employment as oxygen donors in metal-catalysed asymmetric oxidations. The first part describes the synthetic approaches (chemical, photochemical, enzymatic) to furyl hydroperoxides as racemic and enantiopure compounds. The second part covers their employment in Sharpless modified procedure for Read More

The prototypical anionic phospho-Fries rearrangement involves the conversion of an aryl phosphate ester [ArOP(=O)(OR)2] to an ortho-hydroxyarylphosphonate [o-OH-Ar-P(=O)(OR)2]. This review looks in detail at this 1,3-(O→C) migration, from its accidental discovery about 20 years ago to applications in the current literature. From a synthetic perspective, the rearrangement gives rise to a phenol with an ortho C-P bo Read More

In the field of conducting polymers, both poly(pyrrole) and poly(thiophene) have been investigated extensively and are used currently in a wide variety of applications including microelectronics, electrode materials, sensors and optoelectronics. Amongst these polymers, 3- and 3,4- substituted poly(pyrroles) and poly(thiophenes) have received significant attention in recent years as demonstrated by the increase in th Read More