5-/-butyl-3,3-dimethyl

V-methyl- /V-trimethyl-silyltrifluoroacetami de /-butyl dimethyl silylimid- a2ole [24589-78-4] MSTFA (CH3)3SiN(CH3)COCF3... [Pg.70]

TSFPB tetrakis 4- [tcrt-butyl(dimethyl) silyl] -2,3,5,6-... [Pg.107]

The residual pasty solid was purified by column chromatography over silica gel (//-hexane ethyl acetate = 8 1) to afford tert-butyl (dimethyl)phosphine-borane (1) 5.29 g (86 %) as white crystals. [Pg.124]

TSFPB tetrakis[4- tert-butyl(dimethyl)silyl -2,3,5,6-tetraliuorophenyl]borate... [Pg.210]

Der Trialkylsilyl-Rest aus Trichloressigsaure-trialkylsilylestern wird mit Kaliumcarbonat unter Phasentransfer-Katalyse ebenfalls auf Imidazole iibertragen. Nach dieser Methode lassen sich z.B. 1-Trimethylsilyl-imidazol (80%) und l-(tert -Butyl-dimethyl-silyl)-imidazol (75%) herstel-len887. [Pg.109]

CH2)2 —O-Si(CH0 —C(CH,)j 5-Benzoyloxy-3-[ 2- (tert.-butyl-dimethyl-silyloxy)-ethyl -4-niiro-... 57 1 1... [Pg.249]

The method has been applied by the submitters2 to the preparation of cyclohexylmethylpropiolaldehyde diethyl acetal (54% yield) from cyclohexylmethylacetylene and triethyl orthoformate of phenylethynyl n-butyl dimethyl ketal (40% yield) from phenylacetylene and trimethyl -orthovalerate and of phenylethynyl methyl diethyl ketal (34% yield) from phenylacetylene and triethyl orthoacetate. w-B utylpropiolaldehyde diethyl acetal was isolated in 32% yield by heating an equimolar mixture of 1-hexyne and triethyl orthoformate containing catalytic amounts of a zinc chloride-zinc iodide catalyst under autogenous pressure at 190° for 3 hours. [Pg.60]

Bromobenzyl ferf-Butyl(dimethyl)silyl Ether (52) l24... [Pg.111]

C12H,8Br4Cl2F60 Oxide Bis-[(3-chloro-1.4-dibromo-3 4,4-trifluor-butyl)-dimethyl-si lyl]- E10b2, 153 (Educt)... [Pg.694]

Hexanoate Methyl 5-<5-J 2-( 3.5-Bis-[tert.-butyl-dimethyl-silyloxyl-2-methylen-cyclohexyliden)-ethyliden J-1 -methyl-bicyclo [4.3.0]non-9-yl>-2,2-difluoro-F.lOb, 184 (CO - CFj)... [Pg.733]

Tetra-0-(terl.-butyl-dimethyl-silyl)- E14a/3, 645 f. (S-Ar - F)... [Pg.870]

Pentopyranosyl Fluoride 4.5-0-Benzylidene-3-(tert.-butyl-dimethyl-silyloxy)-2-0-methyl-F.lOa. 410 (OH -> F)... [Pg.870]

Butylxylene or Butyldimethylbenzene(called Butyl -xylol or Butyl-dimethyl-benzol in Ger), C4H9<-C6H3(CH3)2 raw 162.26, H 11.18%. Three isomers are described in Beil 5,477,(213) [339]... [Pg.390]

In the first step the free hydroxy group is protected as a ten-butyl dimethyl si lyl ether Then the lactone is reduced to a lactol, which is the cyclic herniacetal of an aldehyde. Overreduction to an alcohol can be prevented by stoichiometric addition of the reducing reagent at low temperature. Selectivity here depends on the relative stability of intermediate 19, which decomposes only in the course of workups (see Chapter 3). [Pg.203]

The starting aldehyde was expected to be particularly sensitive and prone to conjugation as reported for racemic 2-(fe/T-butyl-dimethyl-silanyloxy)-but-3-enal.15 In our case, racemization was an additional problem. [Pg.251]

Different protecting groups such as acetonides, /-butyl dimethyl silyl derivatives proved to be stable under these experimental conditions, but the benzylidene group is completely cleaved.. The rate of photodeoxygenation is greater at the secondary positions [82], as indicated in Scheme 43, with the regioselective photolysis of dipivaloate to give a mixture of monodeoxy and dideoxy derivatives (81) in low yields. [Pg.66]

A very simple preparation is the reaction of t-butyl-dimethyl-silyl chloride (508) with the substrate in presence of imidazole using DMF as solvent270 28 3 (Scheme 78). [Pg.77]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...