3-methylbutene, addition

Butene-2. The experimental results for the reaction of methylene with cis and trans butene-2 are summarized in Table III. In the liquid phase and in the gas phase at high pressures (>200 mm.) the major products are 1,2-dimethylcyclopropane (addition to double bond), pentane-2, and 2-methylbutene-2 (insertion products), and the steric configuration of the butene-2 is predominantly retained in the products... 

With decreasing pressure two principal effects are to be noted. Retention of stereospecificity is diminished in the products 1,1-dimethylcyclopropane and pentene-2, and the proportions of 2-methylbutene-2, 2-methylbutene-l, and, to a slight extent, pentene-2 increase, largely at the expense of the cis addition isomer of 1,2-dimethylcyclopropane. These are the results to be expected from geometric and structural isomerization of the initial products. The thermal isomerization of cis-... 

Figure 13.23. Examples of vapor-liquid equilibria in presence of solvents, (a) Mixture of-octane and toluene in the presence of phenol, (b) Mixtures of chloroform and acetone in the presence of methylisobutylketone. The mole fraction of solvent is indicated, (c) Mixture of ethanol and water (a) without additive (b) with 10gCaCl2 in 100 mL of mix. (d) Mixture of acetone and methanol (a) in 2.3Af CaCl2 ip) salt-free, (e) Effect of solvent concentration on the activity coefficients and relative volatility of an equimolal mixture of acetone and water (Carlson and Stewart, in Weissbergers Technique of Organic Chemistry IV, Distillation, 1965). (f) Relative volatilities in the presence of acetonitrile. Compositions of hydrocarbons in liquid phase on solvent-free basis (1) 0.76 isopentane + 0.24 isoprene (2) 0.24 iC5 + 0.76 IP (3) 0.5 iC5 + 0.5 2-methylbutene-2 (4) 0.25-0.76 2MB2 + 0.75-0.24 IP [Ogorodnikov et al., Zh. Prikl. Kh. 34, 1096-1102 (1961)].

In additions of diborane, the major product is formed by the attachment of boron to the less substituted carbon. For example, addition of diborane to 1-hexene (31) gives a product that has 94 percent of the boron attached to the terminal carbon. Similarly, diborane added to 2-methylbutene-2 (32) gives 98 percent of boron incorporation at C3.58... 

Studies on the photolysis of butene-1 at 1849 A have been made by Harumiya et and by Borrell and Cashmore . Ethane and 1,5-hexadiene are the most important products. Borrell and Cashmore report a total of twenty-five products which in addition to the ethane and 1,5-hexadiene include methane, ethylene, acetylene, propene, propane, allene, cis- and franj-butene-2, 3-methylbutene, n- and isopentane, cis- and fra j-pentene-2, pentene-1, as well as various Cg, C and Cg compounds. The following reactions explain these products. 

The procedure of Crawford et al. was used to effect allylic alkylation in a synthesis of the sesquiterpene (- )-cryptomerione (19) from (— )-carvone.6 Thus allylic alkylation of the acetal of ( + )-dihydrocarvone (16) was effected by treatment with the complex of n-butyllithium and TMEDA followed by addition of l-chloro-3-methylbutene-2. Dihydrocrytomerione (17) was obtained in 70% overall yield. Bromination of (17) with... 

Polyolefin copolymers started with LLDPE and ethylene-propylene rubber (EPR). Today, there are polyolefin copolymers of ethylene with butene-1, hexene-1, octene, cyclopentene, and norbornene and copolymers of propylene with butene-1, pentene-1, and octene-1 in addition to ethylene. There are copolymers of butene-1 with pentene-1, 3-methylbutene-l, 4-methylpentene-1, and octene in addition to its copolymers with ethylene and propylene. There are copolymers of 4-methylpentene-1 with pentene-1 and hexene-1 in addition to its copolymers with butene-1 and propylene. The function of the comonomers is to reduce crystallinity, as compared to the homopolymers, resulting in copolymers that are highly elastomeric with very low... 

A solution of 2 ml of borane-methyl sulfide complex (10 M BH3 in methyl sulfide) in 20 mL THF was placed in a He atmosphere, cooled to 0 °C, treated with 4.2 mL of 2-methylbutene, and stirred for 1 h while returning to room temperature. To this there was added a solution of the impure 3-ethoxy-5-ethylthio-4-methoxystyrene in a little anhydrous THF. This was stirred for 1 h. The excess borane was destroyed with 1 mL MeOH, followed by the addition of 3.8 g elemental iodine, followed in turn by a solution of 0.8 g NaOH in hot MeOH added over the course of 5 min. The color gradually faded, and became a pale lime green. This was added to 300 mL dilute aqueous sodium thiosulfate which was extracted with 2x100 mL petroleum ether. The extracts were pooled, and the solvent evaporated under vacuum to provide crude 1-(3-ethoxy-5-ethylthio-4-methoxyphenyl)-2-iodoethane as a residue. 

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