F 1,3-Butadiene

Ammonium hexacyanoferrate(II), 2577 f Arsine, 0100 Azido-2-butyne, 1473 3-Azidopropyne, 1114 c /.v-A/obcn/cnc, 3484 Azoxybenzene, 3485 Barium azide, 0214 Benzenediazonium nitrate, 2275 Benzotriazole, 2269 Borane, 0135 Bromine azide, 0256 f 3-Bromopropyne, 1090 f 1,2-Butadiene, 1479 f 1,3-Butadiene, 1480 f Buten-3-yne, 1423 f 1-Butyne, 1481 f 2-Butyne, 1482 Cadmium azide, 3957 Cadmium cyanide, 0588 Cadmium fulminate, 0589 Cadmium nitride, 3960... 

Many incidents involving explosions have been attributed, not always correctly, to peroxide formation and violent decomposition. Individually indexed incidents are 2-Acetyl-3-methyl-4,5-dihydrothiophen-4-one, 2807 Aluminium dichloride hydride diethyl etherate, Dibenzyl ether, 0061 f 1,3-Butadiene, 1480 f Diallyl ether, 2431 f Diisopropyl ether, 2542... 

Bis-(2-methoxyethyl) ether, 2549 f 1,3-Butadiene, 1480 f 1,3-Butadiyne, 1385 f 2-Butanol, 1695 f Buten-3-yne, 1423 f Butyl ethyl ether, 2540 f Butyl vinyl ether, 2484 f 2-Chloro-1,3-butadiene, 1451 f Chloroethylene, 0730 f 2-Chloroethyl vinyl ether, 1557... 

ECETOC (1997) 1,2-Butadiene OEL Criteria Document f>pQcia RjspoA.Fio. 12), Brussels, European Centre of Ecotoxicology and Toxicology of Chemicals... 

Butadiene 4-Cbloro-3-dif1uoro-inethyl-1,4.4-trifluoro- ElOa, 331 (OH -> F In - 1.2-Dienc)... 

Butadiene 4-Chloro-3-(chloro-difluoro-methyl)-l, 4,4-trifluoro-E10 (OH F In - 1,2-Dien)... 

Reduction of the metal dimer [CpMo(NO)l2]2 with Na/Hg in the presence of a variety of acyclic dienes generates the (diene)MoCp(NO) complexes in moderate to low isolated yield (equation 8) . For the majority of diene ligands, complexes 60 are formed exclusively as the s-trans isomers as evidenced by NMR spectroscopy and single-crystal X-ray diffraction analysis. In comparison, complexation of the 2,3-dmiethyl-l,3-butadiene initially gives a separable mixture of the s-trans (60) and s-cfs-cornplex (61). The s-cis isomer isomerizes to the more thermodynamically stable s-trans isomer in solution (THF, Zi/2 = 5 min CeHg, f 1/2 = 24 h). 

All possible isomers of 1,2-butadiene were observed in the gas phase deuteration of this molecule. Such isomerization is an unusual feature of diene and alkyne hydrogenation because the desorption rate of di-unsaturated hydrocarbons is usually very slow. A thermodynamic factor can hardly have been promoting this desorption because, from evidence discussed in Section II, F, 1, 1,2-butadiene appears to be most weakly adsorbed of the C4He isomers. One mechanism of reactant isomerization involves simply the loss of a hydrogen atom from adsorbed C4H, for which three relevant structures can be written. The 2-butyne, which was the major isomer produced, was largely unexchanged, how-... 

In general, random SBR with a low amount of block styrene and low amounts of 1,2-butadiene enchainment (<20%) can be prepared in the presence of small amounts of added potassium or sodium metal alkoxides [214, 215]. For example, at 50 °C in the presence of as little as 0.067 equivalents of potassium f-butoxide in cyclohexane, the amount of bound styrene was relatively independent of conversion, in contrast to the heterogeneity observed in the absence of randomizer, that is, tapered block copolymer formation [214]. The polybutadiene microstructure obtained under these conditions corresponds to about 15%... 

---