Butyl triethylsilyl

Lithium triethylsilanetellurol and butyl chloride combined to give butyl triethylsilyl tellurium4. 

Lithium triethylsilanetellurolate, prepared from bisftriethylsilyl] tellurium and ethyl lithium, reacted with an excess of chlorobutane to form butyl triethylsilyl tellurium2. 

TABLE 8. Absolute rate constants for the addition of triethylsilyl, tri-n-butylgermyl and tri-ra-butyl-stannyl radicals to alkenes18a... 

NMO NMP Nu PPA PCC PDC phen Phth PPE PPTS Red-Al SEM Sia2BH TAS TBAF TBDMS TBDMS-C1 TBHP TCE TCNE TES Tf TFA TFAA THF THP TIPBS-C1 TIPS-C1 TMEDA TMS TMS-C1 TMS-CN Tol TosMIC TPP Tr Ts TTFA TTN N-methylmorpholine N-oxide jV-methyl-2-pyrrolidone nucleophile polyphosphoric acid pyridinium chlorochromate pyridinium dichromate 1,10-phenanthroline phthaloyl polyphosphate ester pyridinium p-toluenesulfonate sodium bis(methoxyethoxy)aluminum dihydride (3-trimethylsilylethoxy methyl disiamylborane tris(diethylamino)sulfonium tetra-n-butylammonium fluoride f-butyldimethylsilyl f-butyldimethylsilyl chloride f-butyl hydroperoxide 2,2,2-trichloroethanol tetracyanoethylene triethylsilyl triflyl (trifluoromethanesulfonyl) trifluoroacetic acid trifluoroacetic anhydride tetrahydrofuran tetrahydropyranyl 2,4,6-triisopropylbenzenesulfonyl chloride 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane tetramethylethylenediamine [ 1,2-bis(dimethylamino)ethane] trimethylsilyl trimethylsilyl chloride trimethylsilyl cyanide tolyl tosylmethyl isocyanide meso-tetraphenylporphyrin trityl (triphenylmethyl) tosyl (p-toluenesulfonyl) thallium trifluoroacetate thallium(III) nitrate... 

Moreover, the formation of enoxy-silanes via silylation of ketones127 by means of N-methyl-N-TMS-acetamide (1 72) in presence of sodium trimethylsilanolate (173) was reported in 1969 and since then, the use of silylating reagents in presence of a catalyst has found wide appreciation and growing utilization as shown in recent papers128-132 (Scheme 27). Diacetyl (181) can be converted by trifluoromethylsul-fonic acid-TMS-ester (182) into 2,3-bis(trimethylsiloxy)-l, 3-butadiene (7treatment with ethyl TMS acetate (7 5)/tetrakis(n-butyl)amine fluoride l-trimethylsiloxy-2-methyl-styrene (i<56)130. Cyclohexanone reacts with the combination dimethyl-TMS-amine (18 7)/p-toluenesulfonic acid to 1-trimethylsiloxy-l-cyclohexene (iSS)131. Similarly, acetylacetone plus phenyl-triethylsilyl-sulfide (189) afford 2-triethylsiloxy-2-pentene-4-one (790)132. ... 

Polymerization of 2-triethylsilyl-l, 3-butadiene initiated by n-butyl-lithium in hexane yielded (E)-l, 4-poly(2-triethylsilyl-l, 3-butadiene). The molecular weight distribution (as determined by gel permeation chromatography) of the polymers depended on the ratio of monomer to initiator concentrations. Polymers of low polydispersity (Mu [weight-average molecular weight]/Mn [number-average molecular weight] = 1.3-1.6) and with up to 110,000 w re obtained. The... 

Data for the ultra-high-intensity band for disubstituted polyynes R(C=C) R are collected in Table 5 comparison with the values for unsubstituted polyynes reveals that substitution produces a bathochromic shift and an increase in intensity. The red shift increases in the order Me < t-Bu < EtjSi the difference between the dimethyl and di-/-butyl derivatives remains fairly constant, but that between the di-r-butyl and bis(triethylsilyl) derivatives decreases steadily with increasing values of n. The greater shift for silylated derivatives has been attributed to more effective conjugative interactions in the excited state . 

Lewis-Calvin plots of A versus n are linear for the dimethyl and di-/-butyl derivatives . There is some indication of deviation from linearity in the latter series for n = 12, but this may be a solvent effect. For the bis(triethylsilyl) scries the plot is linear through n = 8, but a definite downward curvature appears for higher members . 

Methyl 2-Butyl-l-triethylsilyl-l-cycIopropanecarboxylate (6, R = Et = Bu) Typical Procedure ... 

Migration of Silyl Groups, 166 Trimethylsilyl, 171 Triethylsilyl, 178 Triisopropylsilyl, 183 Dimethylisopropylsilyl, 187 Diethylisopropylsilyl, 187 Dimethylthexylsilyl, 188 2-Norbornyldimethylsilyl, 189 f-Butyldimethylsilyl, 189 f-Butyldiphenylsilyl, 211 Tribenzylsilyl, 215 Tri-p-xylylsilyl, 215 Triphenylsilyl, 215 Diphenylmethylsilyl, 216 Di-f-butylmethylsilyl, 217 Bis(f-butyl)-l-pyrenylmethoxysilyl, 218 Tris(trimethylsilyl)silyl Sisyl, 218 (2-Hydroxystyryl)dimethylsilyl, 219 (2-Hydroxystyryl)diisopropylsilyl, 219 f-Butylmethoxyphenylsilyl, 219 f-Butoxydiphenylsilyl, 220... 

Selective reactions. Desilylation of triethylsilyl ethers in the presence of t-butyl-dimethylsilyl ethers is accomplished with a mesoporous silica in methanol at room temperature. Selective esterification of nonaromatic carboxylic acids using NaHS04-silica in methanol has also been described. ... 

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