Pentane 3-bromo

Pentanal, 5-amino [14049-15-1], 121 Pentane, 1-bromo- [110-53-2], 82 Pentanediotc acid [ 110-94-1 ], 98 3-Pentenoicacid, 4-methyl- [504-85-8], 70 3-Penten-2-ol, 3-bromo-, acetate [14362-79-9], 35... 

Amyl bromide [Pentane, 1-bromo-], 82 Aniline [Benzenamine], 122 Anilines, o-alkylation of, 15 Anisole [Benzene, methoxy-], 48 Amsyl chloride [Benzene, l-(chloromethyl)-... 

Bromo-3-chloropropane Propane, 1 -bromo-3-chloro- (8,9) (109-70-6) 1-Bromo-5-chloropentane Pentane, 1-bromo-5-chloro- (9) (54512-75-3)... 

C8H18(1) C10H7 Br(2) 2,2,4-trimethyl-pentane 1 -bromo-naphthalene 540-84- 90-11-9 1 ... 

This is separated, washed with petroleum ether, and dried in vacuo. After some time it hardens into a whitish solid, which if it was prepared from a 1-bromo-pentane which had some of its isomer 3-bromo-pentane copresent with it has a melting point of about 80° to 83°C. However, by using a pure 2-bromo-pentane, and/or by recrystallizing a number of times from dilute alcohol, the melting point may be raised to 98° to 100°C, corrected. 

To a stirred solution of (E)-l-bromo-l-hexene (10 mmol) in THF/EtjO/ pentane (24ml, 4 1 1), cooled to —120°C, was added t-BuLi (20mmol in pentane) over 20 min. The pale yellow solution was stirred for 2 h at —110 to... 

A mixture of diethyl 2-bromo-l-phenylethenylphosphonite (30.3 g, 0.1 mol) and dimethyl maleate (14.4 g, 0.1 mol) was stirred for 4 h at room temperature under an argon atmosphere. At this time, hexane was added to the reaction mixture sufficient for complete precipitation, and the resultant crystals (unreacted dimethyl maleate) were removed by filtration. The oily residue was treated on a silica gel column (40/100 pm) using a pentane/acetone (8 2) mixture, allowing the elution and isolation after evaporation of pure l-ethoxy-2-phenyl-4,5-dimetho x yea rb o n y I - A2-X5-phospholene 1-oxide (8.9 g, 27%), which exhibited spectra and analytical data in accord with the proposed structure. 

Sodium, with l-bromo-3-chloro-cyclobutane to give bicyclo [l.l.O]butane, 51, 55 Sodium amalgam, 50, 50, 51 Sodium amide, with 2,4-pentane-dione and diphenyliodonium chloride to give l-phenyl-2, 4-pentanedione, 51, 128 Sodium azide, 50, 107 with mixed carboxylic-carbonic anhydrides, 51, 49 Sodium borohydride, reduction of erythro-3-methanesulfony-loxy-2-butyl cyclobutanecar-boxylate, 51, 12 reduction of 2-(1-phenylcyclo-pentyl)-4,4,6-trimethyl-5,6-dihydro-1,3(4H)-oxazine to 2-(1-phenylcyclopentyl)-4,4, 6-trimethyltetrahydro-l,3-oxazine, 51, 25 Sodium cyanoborohydride, used... 

Phenylpropyltriphenylphosphonium bromide (1) was prepared using the following procedure A solution of 1 equiv of 1-bromo-3-phenylpropane and 1.05 equiv of triphenylphosphine (both obtained from Aldrich Chemical Company, Inc.) in dry toluene is heated at reflux for 50 hr. The resulting solids are collected by vacuum filtration, washed on the filter three times with dry pentane, and dried at 100°C/1 mm for 6 hr affording 1 in 87-92%yield. 

B. (3-Bromo-3,3-difluoropropyl)trimethylsilane. A 1-L, four-necked flask is equipped with a mechanical stirrer, thermometer, Claisen adapter, septum inlet, reflux condenser (the top of which is connected to a calcium chloride drying tube), and a solid addition funnel. The flask is charged with (1,3-dibromo-3,3-difluoropropyl)trimethylsilane (78.3 g, 0.25 mol), and anhydrous dimethyl sulfoxide (200 mL), and the solid addition funnel is charged with sodium borohydride (11.5 g, 0.30 mol) (Notes 7 and 8). The stirred solution is warmed to 80°C, and sodium borohydride is added at a rate sufficient to maintain a reaction temperature of 80-90°C (Note 9). Toward the end of the addition, an additional portion of dimethyl sulfoxide (200 mL) is added via syringe to lower the viscosity of the reaction mixture. After the addition is complete, the mixture is cooled in an ice-water bath, diluted with 100 mL of pentane, and cautiously quenched with 12 M hydrochloric acid until no further gas evolution occurs. The mixture is transferred to a separatory funnel and washed with three, 100-mL portions of 5% brine. The pentane extract is dried over calcium chloride and the solvent removed through a 15-cm Vigreux column. Further fractionation yields 41.5 g (72%) of 3-bromo-3,3-difluoropropyltrimethylsilane, bp 139-141 °C (Note 10). 

Fig. 6 Temperature dependence of koBs values for para-fluoro (1), para-chloro (2), para-bromo (3), and para-iodo (4) singlet phenylnitrene in pentane.

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. ... 

Pentene-2 has been prepared 1 by treating the iodide made from diethylcarbinol with alcoholic potash, by dehydrating active amyl alcohol by means of fused zinc chloride,2 and from 3-bromo-pentane and alcoholic potash.3... 

Pentane 4-Bromo-l-chloro-l.l-difluoro-2-methyl- ElOb,. 484 (F, CC1 — Br + En)... 

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