Tri-n-butyl amine

Free-radical additions of trichlorosilane to acetylenes initiated by benzoyl peroxide were stereospecific trans additions, giving only cis adducts. The same workers observed that tri-n -butyl amine also catalyzed addition of trichlorosilane to phenylacetylene but gave a mixture of cis- and trans -l-phenyl-2-trichlorosilylethene, 1,1-phenyltrichlorosilylethene, and 1-phenyl-l,2-bistrichlorosilylethane (54). No stereospecificity was observable with the amine as catalyst. 

On the basis of the polarographic studies, the direct electron transfer polymerizations of the monomers, of which half-wave potentials could be measured, were conducted keeping the potential at a level where the monomer alone was reduced and the electrolyte was not affected. During the electrolysis of a-methyl-styrene, for example, the red color of the carbanion was observed around the cathode, but dissipacted and vanished quickly. Only low polymers were found in the cathodic compartment, but no polymer in the anolyte. In the polymerization of other monomers almost identical results were obtained. From the fact that tri-n-butyl-amine was detected in the catholyte and analysis of the end group of polymers obtained, two possible termination steps were postulated ... 

An even more convincing argument is provided by the studies (46), results of which are also shown in Fig. 14. Tri-n-butyl amine in dimethyl formamide induces only a slow polymerisation of L-proline NCA whereas the polymerisation of y-ethyl-L-glutamate NCA is very fast under these conditions even if the concentration of the base is reduced by a factor of ten (78, 46). This is a striking observation since proline NCA is an extremely reactive monomer and polymerises very fast on addition of a primary amine. However, addition of 3-methyl hydantoin,... 

The classical Heck reaction involves the Pd(0)-mediated coupling of alkenes with aryl and alkenyl halides at much more convenient laboratory conditions (Scheme 5.3). Hindered amines such as tri-n-butyl amine and triethyl amine are used as a base to neutralize HX produced as a by-product of the catalytic cycle. The Heck reaction has trans-selectivity. 

The slight effect of solvent upon the rate of decomposition is characteristic of tertiary dialkyl peroxides. For example, the rate of decomposition of di-r-butyl peroxide is altered only slightly by changing from the gas phase through hydrocarbon solvents to tri-n-butyl amine (Table 66). These results indicate that there is little ionic character in the activated complex of the rate-determining step (2). 

Methylenation. 2-(Phenylthio)ethanols (2), prepared from ketones (1) and phenylthiomethylhthium, undergo reductive /3-ehmination to give 1-alkenes when treated with the black reagent prepared from TiCU and L1A1H4 in the presence of a tertiary amine [ 1,8-bis(dimethylamino)naphthalene or tri-n-butyl-amine]. Benzene-dioxane is used as solvent for the elimination (4 hr. reflux). ... 

Triacyl phosphites 19,140 Trialkylamines (s. a. Tri-n-butyl-amine, Triethanol-, Triethyl-, Trimethyl-)... 

The polymerization is a precipitation polymerization from gaseous formaldehyde in an inert solvent such as cyclohexane at fairly low temperatures to prevent depolymerization reactions. Amines such as tri-n-butyl amine are used as initiators. The polymer precipitates in the dispersing agent as powder. After completion of the polymerization, it is necessary to stabilize the hydroxyl end groups, for example by esterification with acetic anhydride to prevent the unzipping reaction of Eq. (49). 

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