Of terminal olefins with

Pressure effects have been found to have a significant effect on the enantiose-lectivity of hydrogenation of terminal olefins with ThrePHOX catalysts, in contrast to trisubstituted olefins [17, 25]. For example, in the hydrogenation of 2 with catalyst 12b, 94% ee was obtained at 1 bar H2, compared to 58% ee at 50 bar H2 (Table 30.2). 

ALDEHYDES BY OXIDATION OF TERMINAL OLEFINS WITH CHROMYL CHLORIDE 2,4,4-TRIMETHYL-PENTANAL, 51, 4 ALDEHYDES FROM ACID CHLORIDES BY MODIFIED ROSENMUND REDUCTION 3,4,5—TRIMETHOXYBENZ-ALDEHYDE, 51, 8 ALDEHYDES FROM ACID CHLORIDES BY REDUCTION OF ESTER MESYLATES WITH SODIUM BOROHY-DRIDE CYCLOBUTANECARBOXAL-DEHYDE, 51, 11... 

Oxidation, of primary alcohols to aldehydes, 52, 5 of terminal olefins with chromyl chloride, 51, 6 of 2,4,4-trimethyl-1-pentene with chromyl chloride, 51, 4 with chromium trioxide-pyridine complex, 52, 5... 

ALDEHYDES BY OXIDATION OF TERMINAL OLEFINS WITH CHROMYL CHLORIDE 2,4,4-TRIMETHYLPENTANAL... 

Aldehydes by Oxidation of Terminal Olefins with Chromyl Chloride... 

An application of the fluorous two-phase system to catalytic reactions is the hydro-formylation of terminal olefins with CO and H2 [5]. Aldehydes 1 can be isolated, together with the branched side products 2. In the Q,FiiCF3/toluene solvent mixture, the catalyst [HRh(CO) P[CH2CH2(CF2)5CF3]3 3] is obtained in situ. It acts in the hydroformylation reaction at 100 °C and can be separated afterwards in the fluorous phase. In this process, however, approximately 0.5% of the catalyst remains in the organic phase. Furthermore, the lower solubility of CO and H2 in the fluorous phase produces a lower catalyst activity. Accordingly, the hydroformylation of ethene can be conducted in a continuous process in an autoclave. 

The contribution of Ic is not considered likely the possible rotation about the carbon-carbon <7 bond would result in a non-stereospecific ozone addition on the olefin—in violation of Greenwood s observations (21,22) that a trans- (or cis-) olefin yields only trans- (or cis-) primary ozonide. Retention of configuration is also shown in those cases in which epoxide is formed (20). Finally, a recent communication by Bailey et al. (23) reports the formation of free radicals, arising from the homolytic dissociation of a w or a complex, in the ozonolysis of terminal olefins with bulky substituents capable of stabilizing free radicals. 

The inorganic nanobuilding blocks were found to be attached to the hard segments and greatly enhanced the tensile modulus and strength of the elastomer. Haddad et al. [Ill] and Fu et al. [128] have similarly provided works on condensation polymerization. The well-defined functionalized POSS have been prepared by the hydrosilylation reaction of terminal olefins with octahy-dridosilsesquioxane or direct hydrolytic condensation reactions of silanebearing compounds [75,100,129]. However, clear explanation on the mechanism of direct hydrolytic condensation reaction has not been explored yet. 

So far these well-defined functionalized POSS have been prepared by the hydrosUylation reaction of terminal olefins with octahydridosilsesquiox-... 

Sato, K. Aoki, M. Ogawa, M. Ha himoto,T. Noyori, R., A Practical Method for Epoxidation of Terminal Olefins with 30% Hydrogen Peroxide under Halide-Free Conditions. J. Org. Chem. 

K. Sato, M. Aoki, M. Ogawa, T. Hashimoto, R. Noyori, A practical method for epoxidation of terminal olefins with 30% hydrogen peroxide under halide-free conditions, J. Org. Chem. 61, 8310-8311 (1996). 

Scheme 8 Hydrogenation of terminal olefins with oxazoline-based catalysts bearing an axial chiral biarylphosphite moiety. Full conversion was observed for all entries...

De Poorter, B. and B. Meunier (1985). Metalloporphyrin-catalyzed epoxidation of terminal olefins with hypochlorite salts or potassium hydrogen persulfate. Perkin Trans. U,J. Chem. Soc. 1735-1740. 

First consider the reactions of terminal olefins, with H instead of Et in Scheme 6.1, assuming negligible 1,3 interactions. The progressive increase in t/c ratio as the substituents in the 1,2 positions are changed from Me to Et to Pr (Table 6.2, catalyst system A) shows that 1,2-ee or -aa structures are increasingly favoured relative to ae or ea. 

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