Isomers 2,3-butylene oxides

The three isomers constituting n-hutenes are 1-hutene, cis-2-hutene, and trans-2-hutene. This gas mixture is usually obtained from the olefinic C4 fraction of catalytic cracking and steam cracking processes after separation of isobutene (Chapter 2). The mixture of isomers may be used directly for reactions that are common for the three isomers and produce the same intermediates and hence the same products. Alternatively, the mixture may be separated into two streams, one constituted of 1-butene and the other of cis-and trans-2-butene mixture. Each stream produces specific chemicals. Approximately 70% of 1-butene is used as a comonomer with ethylene to produce linear low-density polyethylene (LLDPE). Another use of 1-butene is for the synthesis of butylene oxide. The rest is used with the 2-butenes to produce other chemicals. n-Butene could also be isomerized to isobutene. ... 

O 22.19%. Several isomers are known. A liq mixt of isomeric butylene oxides has the props bp 62-5°, Hash p 5°F, pour p -150°, d 0.826 at 25°, vap d 2.49 highly toxic liq dangerous when exposed to heat or flame expl range 1.5 to 18.3%(Ref 2). Other props methods of prepn are given in the Refs. The 1,4-isomer (tetrahydrofuran or tetramethylene oxide) is described in detail in the Refs. Butylene oxides are used as solvs as org intermediates Refs l)Beil 17, 10, (5) [l5l 2)Sax(l957), 405 1166 3)CondChemDict(196l), 186 1122... 

Ln(tfc)3 chelates were used to probe the meso structure of dieldrin (32) " and meso and chiral isomers of cis- (32 ) and frawi-4,5-dihydroxy-4,5-dihydroaldrin (32") . For the me o-compounds 32 and 32" in the presence of Ln(tfc)3 chelates, prochiral pairs of hydrogen atoms such as H4-H5 and H3-H6 exhibit distinct resonances. The H4-H5 pair also couple to each other. For each enantiomer of the chiral compound (32c), the H4-H5 pair is equivalent and these appear as a singlet. In the presence of Ln(tfc)3, two singlets are observed, one each for the H4-H5 pair of the (R)- and (5 )-isomers. A similar analysis of the meso and rfZ-isomers of cis- and frawi-2,3-butylene oxide was facilitated through the use of Ln(tfc)3 chelates. ... 

C4H8O 106-88-7 1,2-Butylene oxide see Ethyloxirane ... 

The phosphorane of the phosphonium salt (677) was reacted with p-car-boethoxybenzaldehyde (678) in butylene oxide to give the isomeric tetrahydronaphthalene derivatives (679) and (680). The trans compound (679), which is predominantly formed and is highly active in the antipapilloma test, was isolated in crystalline form from this isomer mixture. The pure cis compound (680), which has hardly any activity, was isolated from the mother liquor by repeated thin-layer chromatography or more productively by high-performance liquid chromatography. 

To analyze - C4 hydrocarbons at concentrations as low as 1 ppm the best adsorbent is aluminum oxide because of its unique selectivity. One of the most widely used applications is the analysis of butylene isomer streams. For the separation of butylenes the AI2O3 column with a sodium sulfate deactivation will provide the best selectivity. As can be seen in Fig. 7-30 the resolution between the four butylene isomers is very high. The most difficult butylene... 

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