Rrans-Piperylene

Dannenberg and Richards21 have reported evidence for a piperylene-ferrocene complex on the basis of (I) new absorptions between 220 and 300 mjj. for piperylene/ferrocene mixtures in n-heptane and n-hexane, and (2) the appearance in the nmr spectrum of rrans-piperylene of a new methyl doublet when ferrocene is present. Guillory, Cook, and Scott16 have reported that, although they were unable to detect a complex using nmr, they did note small shifts in the uv spectrum of ferrocene when piperylene was added. This latter observation is consistent with a diene-ferrocene complex. 

Kinetic investigations presented in [247, 248] showed that use of TiCU as catalyst for industrial piperylene fraction polymerization (components content, mass % rrans-piperylene 60,8, cis-piperylene 37,2, etc.) allows to produce oligopiperylene with high yield (80-95%) with desired MM (80-2000) at comparable high process duration (nearly 1 hour). Polymerization process in toluene medium is characterized by the first orders by catalyst and monomer with constants of chain propagation, transfer on monomer and catalyst rates 1,5, 0,04 and 0,86 l/mole-min accordingly. Oligomers MMD has unimodal character, but with synthesis temperature rise products polydispersity increases. 

Diels-Alder dienes 1-Acetoxybutadiene. Butadiene. Cyclopentadiene. (rans,mins-l,4-Diacetoxybutadiene. 2,5-Di-o-anisyl-3,4-diphenylcyclopentadienone. 5,5-Dimethoxy-l, 2,3,4-tetrachlorocyclopentadienone. 2,3-Dimethylbutadiene. 6,6-Dimethylfulvene (see o-Acetoxy acrylonitrile). 2,4-Dimethyl-l,3-pentadiene (see Diethyl azodicarboxylate). 2,3-Diphenyl-butadiene. 1,3-Diphenylisobenzofurane (see Potassium I-butoxide). rrans,/nus-l,4-Diphenyl-butadiene. 1,3-Diphenylisobenzofurane. Hexachlorocyclopentadiene. Isobenzofurane. l-o-Nitrophenylbutadiene-1,3. Oxepin (see Diazabicyclo[3.4.0]nonene-S). Phenylcyclone. Piperylene. n-Pyrone (see also Methyl vinyl ketone). Tetrachlorocyclopentadienone. Tetra-chlorofurane. Tetraphenylcyclopentadienone. 

Microstructures of piperylene oligomers unsaturated part and polyisoprene were determined by IR-spectroscopy on "Specord M80". Absorption bands at 730, 750, 910 and 967 cm corresponding to CIS-1,2-, CIS-1,4-, 3,4- and rrans-(l,2 + l,4)-units of oligopiperylene accordingly were used as analytical. Polyisoprene microstructure was determined by absorption bands 840 and 889 cm ... 

Treatment of buca-l,3-diene with titaniumfiv) chloride and diethylaluminium chloride gave a mixture of cis,rrans,rran cyclododeca-l,5,9-triene and all-trons-cyclohexadeca-l,5,9,13-tetraene. The co-dimerization of buta-1,3-diene and iso-prene or trons-1-piperylene by nickel acetylacetonate in the presence of triphenyl-phosphite and perhydro-9b-alumophenalene to give 1- or 3-methylcyclo-octa-1,5-diene, has been studied. Buta-1,3-diene has been cyclo-oligomerized in the presence of a nickel catalyst to give a mixture all-rrans-cyclododeca-l,5,9-triene, all trans-cyclohexadeca-1,5,9,13-tetraene and 11-vinyl-all-trans-cyclotetradeca-1,4,8-triene, in the ratio of 80 15 5, respectively, in 90% combined yield. The catalytic... 

A strain-crystallizing material like NR shows much better autohesion. It can be processed to a relatively low viscosity for easy wetting on contact, and still exhibit green strength due to strain-induced crystallization. Several other strain-crystallizable elastomers have been synthesized and shown to exhibit autohesion and green strength comparable or superior to that of NR. These include rran.s-polypen-tenamer, fran -butadiene-piperylene elastomers, and uranium-catalyzed polybutadiene. 

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