Pseudo group 13 element

NaK29Hg48 A Complex Ternary Amalgam With Mercury Acting as a Pseudo Group 13 Element [9]... 

Each of the zinc group elements has two electrons beyond a pseudo-rare-gas structure, that is, two electrons beyond a completed d subshell. 

The greatest body of work in hypervalent chemistry has been carried out on lO-X-5 structures, most often tbp phosphoranes. However, the results have been generalized in most cases to include all pentacoordinate main group elements. They also have implications for pseudo-tbp structures such as the lO-S-4 sulfuranes. Some of the more important aspects are described in this Section. 

Summary Trimethyl- and triisopropyl-silyl diazomethane derivatives have been used for the synthesis of new types of diazo derivatives including those featuring a heavier main-group element or a transition metal directly bound to the diazo-carbon. They are also precursors to a variety of stable nitrilimines and carbodiimides, and stable pseudo-diazoalkenes and carbenes. (Phosphino)(silyl)carbenes have been used in the synthesis of new types of heterocycle including some stable four-7c-electron four-membered derivatives. 

Dye. J.L. Electrides From ID Heisenberg chains to 2D pseudo-metals. Inorg. Chem. 1997, 36. 3816-3826. Corbett. J.D. Exploratory synthesis in the solid state. Endless wonders. Inorg. Chein. 2000. 39. 5178-5191. Corbett, J.D. Diverse naked clusters of the heavy main-group elements. Electronic regularities and analogies. Stmct. Bond. 1997, 87. 157- 193. 

Turning finally to compounds with bonds from the heavier Group 14 elements to heavier Group 15 elements we may note compounds such as [Sn C(PMe2)3)2] which has the pseudo trigonal bipyramidal structure (6). This complex, which has Sn bonded exclusively to four P atoms, is formed as yellow crystals by the... 

A methyl group may be shown in a structural representation as CH3 or Me, and similar pseudo-elemental symbols are used for ethyl, propyl and butyl side chains. It is cortrmon to represent a phenyl group as either Ph or as a hexagon with a circle irtscribed within it. This circle is meant to represent electron density that lies above and beneath the main plane of the molecule. However, when faced with... 

Pseudo homogeneous models of fixed bed reactors are widely employed in reactor design calculations. Such models assume that the fluid within the volume element associated with a single catalyst pellet or group of pellets can be characterized by a given bulk temperature, pressure, and composition and that these quantities vary continuously with position in the reactor. In most industrial scale equipment, the reactor volume is so large compared to the volume of an individual pellet and the fraction of the void volume associated therewith that the assumption of continuity is reasonable. 

The described procedure has been widely used by Smith III and coworkers [250] in the efficient total synthesis of natural products containing extended 1,3-hydroxylated chains. This architecture is often found as a structural element in polyene macrolide antibiotics [251] such as mycotoxin A and B, dermostatin, and roxaticin. The Smith group used the above-mentioned approach (e. g., as five-component coupling) for the synthesis of the pseudo-C2-symmetric trisacetonide (+)-2-471 [252], which was employed by Schreiber and coworkers [253] within the synthesis of (+)-mycotoxin A (2-470a) (Scheme 2.108). Thus, lithiation of 2.5 equiv. dithiane 2-462b followed by treat-... 

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