Tetrakis methane

A number of tetrakis-methane-sulphonyl esters of wyo-inositol have been prepared the diacetate (31) underwent azide displacement with acetate participation leading to 3-amino-3-deoxy-w co-inositol derivatives, e.g. (32). ... 

Tetrakis [methyl ene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane [6683-19-8]... 

A large number of hindered phenoHc antioxidants are based on the Michael addition of 2,6-di-/ f2 -butylphenol and methyl acrylate under basic catalysis to yield the hydrocinnamate which is a basic building block used in the production of octadecyl 3-(3,5-di-/ f2 butyl-4-hydroxyphenyl)propionate, [2082-79-3], tetrakis(methylene-3(3,5-di-/ f2 butyl-4-hydroxylphenyl)propionate)methane [6683-19-8], and many others (63,64). These hindered phenolic antioxidants are the most widely used primary stabilizers in the world and are used in polyolefins, synthetic and natural mbber, styrenics, vinyl polymers, and engineering resins. 2,6-Di-/ f2 -butylphenol is converted to a methylene isocyanate which is trimerized to a triazine derivative... 

Commercially important di- and polyphenoHc stabilizers include 2,2 -methylenebis(6-/ r2 -butyl- -cresol) [85-60-9] (7), l,3,5-trimethyl-2,4,6-tris(3 5 -di-/ /f-butyl-4-hydroxyben2yl)ben2ene [1709-70-2] (8), and tetrakis [methylene(3,5-di- / r2 butyl-4-hydroxyhydrocinnamate)]methane [6683-19-8] (9). 

The synergistic effect of a hydroperoxide decomposer, eg, dilauryl thiodipropionate [123-28-4] (34), and a radical scavenger, eg, tetrakis[methylene(3,5-di-/ f2 butyl-4-hydroxyhydrocinnamate)]methane (9), ia protecting polypropylene duting an oxygen-uptake test at 140°C is shown ia Table 3. 

Tetrahydroxymethylmethane Tetrakis (Hydroxymethyl) methane Tetramethylolmethane Chemical Formula C(CH20H)4-... 

Pentaerythritol [Pentaerythrite, Tetrakis (hy droxy methyl)methane, Tetramethylol-methane, Methanetetramethylol, 2,2-Bis-(hydroxymethyl)-1,3-propanediol (name... 

Pentaarythrityltatrakis(nitramine) [Tetrakis(nitra-minomethyl)methane, PETX]. CsHl2N808, mw... 

PETX. Code name for Tetrakis(nitramino-methyl)-methane or Pentaerythrityltetrakis(nitra-mine) (qv in this Vol)... 

Tetrahalosulphones, reactions of 417 Tetrakis(alkylsulphinylmethyl)methanes 575 Thiacyclohexanes, reactions of 599 Thiacyclo[3.3.0]octane oxides, synthesis of 607... 

An unprecedented carbene insertion reaction was observed on reaction of the cationic re-arene ruthenium amidinates with trimethylsilyldiazo-methane (Scheme 145, TFPB = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate). 

It was thus of interest to see whether satellites due to tin-tin coupling could be observed. The first case where this was possible was tetrakis(trimethylstan nyl)methane, the spectrum of which is shown in Fig. 53. 

Bazan and co-workers [93] coupled four branches of stilbene chromophores to a central C atom, leading to tetrastilbenylmethane [C(STB)4, 46a] tetrakis (4-ferf-butylstyryIstiIbenyljmethane [C(f-BuSSB)4, 46b], and the higher homolo-gue tetrakis 4-[4 -(4"-terf-butyl-styryl)styryl]stilbenyl methane [C(4R—f-Bu)4, 46c]. For 46b, Tg is 190°C, and for 46c it is as high as 230°C. Tetrakis(4,4 -2,2-diphenyl-vinyl)-l,l -biphenyl]methane [C(DPVBi)4, 47a] and the cyano derivative 47b exhibit the glass transition at 142 and 174°C, respectively. Similar compounds to 46a and 46b have also been synthesized with silicon and adaman-tane as the tetrahedral center. 

Tetra(3-aminopropanethiolato)trimercury perchlorate, 3582 Tetrakis(hydroxymercurio)methane, 0471 Trimercury tetraphosphide, 4616... 

As an example, carbon tetrachloride (436) gave tetrakis(trimethylsilyl)methane by reaction with chlorotrimethylsilane in 80% isolated yield. 

Fig. 9. Approximate Bragg resolution for the first exposure of each of about 200 crystals from H. marismortui SOS subunits that were investigated at XI1, EMBL/DESY, Hamburg (ERG), in August 1986 at —4° to 19 °C. Shading indicates heavy-atom derivative test crystals (undecagold-cluster and tetrakis(acetoxymercuri)methane (TAMM) see paragraph 4 Phase Determination)...

Heavy-atom derivation of an object as large as a ribosomal particle requires the use of extremely dense and ultraheavy compounds. Examples of such compounds are a) tetrakis(acetoxy-mercuri)methane (TAMM) which was the key heavy atom derivative in the structure determination of nucleosomes and the membrane reaction center and b) an undecagold cluster in which the gold core has a diameter of 8.2 A (Fig. 14 and in and ). Several variations of this cluster, modified with different ligands, have been prepared The cluster compounds, in which all the moieties R (Fig. 14) are amine or alcohol, are soluble in the crystallization solution of SOS subunits from H. marismortui. Thus, they could be used for soaking. Crystallographic data (to 18 A resolution) show isomorphous unit cell constants with observable differences in the intensity (Fig. 15). 

Eine eisgekiihlte Mischung aus 6-Oxa-bicyclo[3.1.0]hex-2-en in Nitro-methan in Gegen-wart von 1 mol% Tetrakis-[triphenylphosphan]-palladium liefert 5-Hydroxy-3-nitrome-thyl-cyclopenten (87Vo)1 ... 

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