Further reduction in the presence of more triphenylphosphine gives tetrakis ( triphenylphosphine ) palladium ( 0 ); the second reaction may be carried out without purifying the intermediate dichloride:
12.
The tetrakis square tiling was used for a set of commemorative postage stamps issued by the United States Postal Service in 1997, with an alternating pattern of two different stamps.
13.
The intersection of the three octahedra is a convex polyhedron with 14 vertices and 24 faces, a tetrakis hexahedron, formed by attaching a low square pyramid to each face of the central cube.
14.
Examples of chemicals sold in ampoules are injectable pharmaceuticals, air-sensitive reagents like tetrakis ( triphenylphosphine ) palladium ( 0 ), hygroscopic materials like deuterated solvents and trifluoromethanesulfonic acid, and analytical standards.
15.
A 24-cell viewed under a vertex-first perspective projection has a surface topology of a tetrakis hexahedron and the geometric proportions of the rhombic dodecahedron, with the rhombic faces divided into two triangles.
16.
The intramolecular Heck reaction involved tetrakis ( triphenylphosphine ) palladium ( 0 ) and potassium carbonate in acetonitrile at reflux to give diene "'39 "'and to complete the formation of the B ring.
17.
I did some investigation, and found that the disdyakis dodecahedron can be formed from a " rhombic " dodecahedron by quartering each face and raising the center point ( as " tetrakis " ).
18.
Electron rich organic molecules like tetrakis ( dimethylamino ) ethylene ( TDAE ) are effective reducing agents capable of generating the anion from alkyl halides such as 5-chloromethyl-6-nitrobenzo [ 1, 3 ] dioxole:
19.
Tetramethylurea is also formed during the oxidation of tetrakis ( dimethylamino ) ethylene ( TDAE ), a very electron-rich alkene and a strong reducing agent, available from tris ( dimethylamino ) methane by pyrolysis or from chlorotrifluoroethene and dimethylamine.
20.
The tetrakis hexahedron is the Kleetope of the cube, formed by adding a square pyramid to each of its faces, and the pentakis dodecahedron is the Kleetope of the dodecahedron, formed by adding a pentagonal pyramid to each face of the dodecahedron.
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