Storage major compounds

Uranium can exist in five oxidation states +2, +3, +4, +5, and +6 (Lide 1994) however, only the +4 and +6 states are stable enough to be of practical importance. Tetravalent uranium is reasonably stable and forms hydroxides, hydrated fluorides, and phosphates of low solubility. Hexavalent uranium is the most stable state, and the most commonly occurring state is UjOg, although there are a few localized storage locations for anthropogenic uranium hexafluoride (UFg) (EPA 1991). Major compounds of uranium include oxides, fluorides, carbides, nitrates, chlorides, acetates, and others. One of the characteristics of 002" ions is their ability to fluoresce under ultraviolet light. 

Treatment of 3-diazo-3//-[ 1,2,4]triazole with 1-morpholinocyclohexene or 1-piperidinyl cyclohexene gave triazolotriazine 818 (87JOC5538), and with 1,1-dimethoxyethane afforded a mixture of two isomers of triazolo[3,4-c]triazine 819 and triazo)o[5,l-r]triazine 820, respectively [90JCS(P2)1943]. Compound 819 was the major product and it converted on storage to 820 (Scheme 165). 

The indole- and benzindole-cyanine dyes illustrated in Scheme 6 are used by many major manufacturers in optical disk recording applications. These types of dye tend to be more light-stable than many other readily synthesized polymethine dyes. To increase the photostability, the dyes are used in combination with various types of stabilizers such as nickel dithiolato complexes and selected tertiary aromatic amine compounds.199 The application of cyanine dyes for optical storage media was primarily developed in Japan203 and several dyes and compatible stabilizers are commercially available in pure form from Japanese suppliers.199... 

A major advantage of the sequence presented here is that the aldehyde group is protected at the siloxycyclopropane stage, which allows convenient storage of this stable intermediate. Of equal importance is the valuable carbanion chemistry that can be carried out a to the ester function. Efficient substitution can be achieved by deprotonation with LDA and subsequent reaction with electrophiles.12-13-6 This process makes several a-substituted [1-formyl esters available. Other ring opening variants of siloxycyclopropanes - mostly as one-pot-procedures - are contained in Scheme I. They underscore the high versatility of these intermediates for the synthesis of valuable compounds.6 Chiral formyl esters (see Table, entries 2-5) are of special... 

A major concern of this review is the tailoring of the redox behaviour of organic compounds, i.e. the optimization of such systems for electron storage and electron hopping. While the emphasis is on reduction and thus on anion formation, it has been shown on many occasions that oxidative cation formation leads to analogous conclusions (Meerholz and Heinze, 1990 Lewis and Singer, 1965). The structure of this text is thus obvious. 

In monocotyledonous plants, including all the cereals, storage proteins are found mainly in the endosperm. The major storage compounds are carbohydrates rather... 

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