Chemical maturity

I was indeed fortunate to have grown to chemical maturity under Sir Robert Robinson, and in an environment where heterocyclic chemistry was certainly not neglected. This being so, it is natural that I feel the dissemination and rationalization of knowledge in heterocyclic chemistry to be of vital importance. Recently several good heterocyclic texts have appeared, but a need exists for a medium in which current advances in the subject can rapidly be presented to a wide audience. The present series aims to make available to graduate students and research workers in academic and industrial laboratories up-to-date reviews of a wide variety of heterocyclic topics. 

Brimhall G. H., Lewis C. J., Ague J. J., Dietrich W. E., Hampel J., Teague T., and Rix P. (1988) Metal enrichment in bauxite by deposition of chemically-mature eolian dust. Nature 333, 819-824. 

Fig. 3.5. Correlation diagram of porosity with mineralogical (chemical) maturity (increase of silica, especially secondary) and with structural maturity related to different facies-environment situations...

Chetnoinformatics has matured to a sdentific discipline that will change - and in some cases has already changed - the way in which we perceive chemistry. The chemical and, in particular, the pharmaceutical industry are in high need of che-moinformatics specialists. Thus, this field has to be taught in academia, both in specialized courses on chemoinformatics and by integrating chemoinformatics into regular chemistry curricula. 

With the advent of quantum mechanics, quite early attempts were made to obtain methods to predict chemical reactivity quantitatively. This endeavor has now matured to a point where details of the geometric and energetic changes in the course of a reaction can be calculated to a high degree of accuracy, albeit still with quite some demand on computational resources. 

Acetic anhydtide is a mature commodity chemical ia the United States and its growth rate in the 1970s and 1980s was negative until 1988 when foreign demand neatly doubled the exports of 1986. This increase in exports was almost certainly attributable to the decline in the value of the U.S. doUar. Over four-fifths of all anhydtide production is utilized in cellulose acetate [9004-35-7] manufacture (see Cellulose esters). Many anhydtide plants are integrated with cellulose acetate production and thus employ the acetic acid pyrolysis route. About 1.25 kg acetic acid is pyrolyzed to produce 1.0 kg anhydtide. 

For well over 100 years after its discovery and initial preparation, oxygen was made either chemically or by the electrolysis of water. Early in the twentieth century, Linde and Claude introduced processes for the Hquefaction and distillation of air that have since grown into a mature and highly competitive industry. In 1991, over 13.4 X 10 (4.7 x 10 ft ) of oxygen was produced in the United States. About 70 X 10 (24.7 x 10 ft ) was... 

P. A. Hedin,. . Meim, and R. M. Holhngworth, eds., Matural and Engineered Pest Management Mgents, ACS Symposium Series No. 551, American Chemical Society, Washington, D.C., 1994, 550 pp. 

Production and Economic Aspects. Aspirin is produced in the United States by The Dow Chemical Company, Rhc ne-Poulenc, and Norwich (a division of Proctor Gamble). Globally, Rhc ne-Poulenc has additional production faciHties in France and in Thailand. Bayer is self-suppHed from production units in Spain and Turkey over the years many small plants have been estabHshed around the world for regional or country supply. The aspirin market is increasingly globally suppHed. Aspirin is generally considered mature, and only population increases and new uses will affect its production and demand, which is thought to be of the order of 30—35,000 t for total world consumption. The May 1995 price was 8.30/kg (18). 

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