1-Bromobutane structure

Draw stick structures of the possible products for the reaction of sodium ethoxide with (a) 1-bromobutane ... 

C03-0010. Draw structural formulas of the following molecules butane, 2-butanol, t-butanol, and t-bromobutane. 

Only limited information is available on the effect of active site structure on activity of polymer-supported quaternary ammonium ion catalysts for alkylation of phenylacetonitrile (Eq. (7)). Dou and co-workers 10l) reported approximately the same activity for six different type 1 (2) and type 2 (14) Dowex105) ion exchange resins. Conversions of 5(1-70% were obtained in 10 h at 70 °C using 0.1 mol each of phenylacetonitrile and 1-bromobutane, 40 ml of 50% NaOH and 1 4 g (3.5-18 mequiv) of resin. The triphase mixtures were vigorously stirred by a method not reported. The similar results from resins of widely different cross-linking and porosity, both macro-... 

Effects of polymer structure on reaction of phenylacetonitrile with excess 1-bromo-butane and 50% NaOH have been studied under conditions of constant particle size and 500 rpm stirring to prevent mass transfer limitations I03). All experiments used benzyltrimethylammonium ion catalysts 2 and addition of phenylacetonitrile before addition of 1-bromobutane as described earlier. With 16-17% RS the rate constant with a 10 % CL polymer was 0.033 times that with a 2 % CL polymer. Comparisons of 2 % CL catalysts with different % RS and Amberlyst macroporous ion exchange resins are in Table 6. The catalysts with at least 40% RS were more active that with 16 % RS, opposite to the relative activities in most nucleophilic displacement reactions. If the macroporous ion exchange resins were available in small particle sizes, they might be the most active catalysts available for alkylation of phenylacetonitrile. 

Problem 6.13 Give the structural formulas for the alkenes formed on dehydrobromination of the following alkyl bromides and underline the principal product in each reaction (a) 1-bromobutane, (b) 2-bromobutane, (c) 3-bromopentane, (d) 2-bromo-2-methylpentane, (e) 3-bromo-2-methylpentane, (/) 3-bromo-2,3-dimethyl-pentane. ... 

Write structural formulas for all the alkenes that can be formed in the reaction of 2-bromobutane with potassium ethoxide. 

Many other alcohols react with HBr, with the reaction mechanism depending on the structure of the alcohol. For example, butan-l-ol reacts with sodium bromide in concentrated sulfuric acid to give 1-bromobutane by an Sn2 displacement. The sodium bromide/sulfuric acid reagent generates HBr in the solution. 

Other additives that enhanced the yields of styrene polymer were carbon tetrachloride, l,2-dibromo-l,l,2,2-tetrafluoroethane, 1-bromobu-tane and 2-bromobutane. Yields from monomers other than styrene were not all increased by halogenated additives some even were decreased. It was impossible to develop any rational relationship between monomer structure and susceptibility of the monomer to yield enhancement by halogenated additive. 

Connectivity and stereoisomerism give chemists a way to uniquely differentiate one molecular structure from another. The molecular formula C4H9Br, for instance, represents five different substances (see Figure 4). Predictably, although there is only one compound for each of the connectivities designated 1-bromobutane, 2-bromo-2-methylpropane, and... 

In contrast, 2-bromobutane has two structurally different /8-carbons from which a proton can be removed. So when 2-bromobutane reacts with a base, two elimination products are formed 2-butene and 1-butene. This E2 reaction is regioselective because more of one constitutional isomer is formed than the other. 

A haloalkane of general structure R—CH2—CHX—R will have two conformations with H anti to X one gives the cis and the other gives the trans alkene as product. For example, consider 2-bromobutane ... 

The versatility of TOT in clathrate formation is further illustrated by the discovery of several other clathrate types belonging to various space groups PT (/raw-stilbene, cw-stilbene a-bromobutyric acid benzene ) Pl(PT) (methyl tran -cinnamate, methyl cw-cinnamate) P2 (weso-2,3-butanediol carbonate) P2j/c (weTO-2,3-di-bromobutane) C2jc (3-bromooctane ethyl a-bromobuty-rate ° ) Pbca (l,l,l-trifluoro-2-chloro-2-bromoethane) Pbcn (dl-2,3-dibromobu-tane) hexagonal R (a-chlorotetrahydropyran) The clathrates for which X-ray crystal structure determinations have been completed are indicated in Table 1. 

The inadequacy of the X-ray model for a straightforward evaluation of the relative contribution of the dynamic and static disorders has been emphasized in the structure analysis of TOT/(dl)-2-bromobutane. Suprisingly, the / -ratio test favored space group PS, as opposed to space group P3j21, in spite of the presence of pairs of TOT molecules shown to be identical within the limits of experimental error and symmetrically related by C2 axes. In this context it was demonstrated how static disorder could be mimicked by a magnified thermal motion of the Br atom. The Hamilton test gave opposite results with the TOT/(R)-2-butanol clathrate. 

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