Green mechanism

Further simulations have been performed. In contrast to what was observed for bis-cyclopentadienyl metallocenes, mono-cyclopentadienyl systems did reveal a significant barrier to insertion [lOj. However, for all these systems it turned out that insertion only proceeded after the formation of a relatively stable agostic interaction, an observation that clearly supports the Brookhart-Green mechanism. 

Formazane formation 335 f. Frieswell-Green mechanism 400 f. Fullerenes, reaction with ArNj 188 6-Fulvenone 136 Furan... 

Lauder, T., and J. H. Green Mechanism of Formation of Ether, Using... 

Meconium is the earliest stool of an infant, composed of materials ingested during the time the infant spends in the uterus. It should be completely passed by the end of the first few days of postpartum life, with the stools progressing toward yellow (digested milk). Sometimes the meconium becomes thickened and congested in the ileum, a condition known as meconium ileus. Meconium ileus is often the first symptom of CF. In CF patients, the meconium can form a bituminous black-green mechanical obstruction in a segment of the ileum. About 20% of cases of CF present with meconium ileus. 

The early work on diazoamino rearrangements has been well summarized by Shine 3,244) Briefly, all the previous evidence supported an intermolecular, specifically acid-catalyzed process, the so-called Friswell-Green mechanism, postulated in 1884(1). Under certain conditions, particularly when not water, but the corresponding amine is used as solvent, a modification of this mechanism can occur. Thus Goldschmidt et al. found in 1924 that the decomposition of the protonated diazoamino compound to amine and diazonium ion can be catalyzed by the anion of the acid when the latter is weak, for example, nitrobenzoic acid. With mineral acids the anion is a weak nucleophile and no evidence was found for such a pathway, but it was postulated that here the amine itself can catalyze the fission of the protonated diazoamino compound. Neither of these processes has been observed in aqueous or partially aqueous solution, for example, in 95 % aqueous ethanol... 

Berlin green, FeFe(CN)mechanism postulated for the interchange of substituents in trigonal-bipyramidal 5-co-ordinate complexes, e g. PF, and its substituted derivatives. berthoUide compound Solid phases showing a range of composition. 

Green M S 1954 Markov random processes and the statistical mechanics of time-dependent phenomena. II. Irreversible processes in fluids J. Chem. Phys. 22 398... 

Wachutka G, Fleszar A, Maca F and Scheffler M 1992 Self-consistent Green-function method for the calculation of electronic properties of localized defects at surfaces and in the bulk J. Phys. Condens Matter A 2831 Bormet J, Neugebauer J and Scheffler M 1994 Chemical trends and bonding mechanisms for isolated adsorbates on Al(111) Phys. Rev. B 49 17 242... 

Seideman T and Miller W H 1992 Quantum mechanical reaction probabilities via a discrete variable representation-absorbing boundary condition Green function J. Chem. Phys. 97 2499... 

Readers interested in medicinal chemistry can obtain an excellent overview ft om the book The Practice of Medicinal Chemistry, edited by Wermuth [1]. The first edition is nicknamed The Green Bible by medicinal chemists. "The Red Bible written by Bbhm, Klebe, and Kubinyi describes the development of new drugs [2]. An overview of different classes of drugs and their mechanisms of action is given by Mutschler [3]. 

White Phosphorus Oxidation. Emission of green light from the oxidation of elemental white phosphoms in moist air is one of the oldest recorded examples of chemiluminescence. Although the chemiluminescence is normally observed from sotid phosphoms, the reaction actually occurs primarily just above the surface with gas-phase phosphoms vapor. The reaction mechanism is not known, but careful spectral analyses of the reaction with water and deuterium oxide vapors indicate that the primary emitting species in the visible spectmm are excited states of (PO)2 and HPO or DPO. Ultraviolet emission from excited PO is also detected (196). 

In sintering, the green compact is placed on a wide-mesh belt and slowly moves through a controlled atmosphere furnace (Fig. 3). The parts are heated to below the melting point of the base metal, held at the sintering temperature, and cooled. Basically a solid-state process, sintering transforms mechanical bonds, ie, contact points, between the powder particles in the compact into metallurgical bonds which provide the primary functional properties of the part. 

---