ChemInform Abstract: Preparation of 1,3‐Dimethyladamantane from cis,trans,trans‐1,5,9‐Cyclododecatriene.

Abstract

172ChemInform Abstract The new catalytic system consisting of dicyclopentadienyltitanium dichloride and trisisobutylaluminum catalyzes the rearrangement of cis,trans,trans-dodecatriene (I) to give the tricyclododecenes (V) and (VI), together with (VII), whereas with polyphosphoric acid a mixture of the octahydroacenaphthenes (II) and (III) is obtained. Both mixtures are hydrogenated and the resulting hydrocarbons (IV), (VII) and (VIII), or (VIII) and (IX) rearrange in the presence of aluminum tribromide, producing 1,3-dimethyladamantane (X). (NMR-, MS-data).

Stereospecific Polymerizations of Conjugated Dienes by Single Site Iron Complexes Having Chelating N,N,N-Donor Ligands

“…There has been recent interest in the use of soluble transition metal catalysts such as CpTiCl 3 /MAO, − CpTiCl 2 /MAO, CpTiCl 3 /Ph 3 CB(C 6 F 5 ) 4 /AliBu 3 , Ti(OiPr) 4 /MAO, Ti(CH 2 Ph) 4 /MAO, Ni(acac) 2 /MAO, Co(acac) 2 /MAO, and Ni(oct) 2 /AlF 3 /AlEt 3 for 1,4-polymerizations of isoprene and 1,3-butadiene to obtain high molecular weight polymers with low polydispersities as efficient low-cost materials for improved synthetic rubber. 1,2-Poly(1,3-butadiene) and 3,4-poly(isoprene) have also been prepared using homogeneous catalysts like V(acac) 3 /AlEt 3 and Cr(acac) 3 /MAO to use as plastic rollers for printing of polymer films, seals, and children's toys.…”

Vapor Pressure and Liquid Heat Capacity of Perhydroacenaphthylene and Perhydrophenanthrene

“…The data by Grosse et al as well as the data by Schneider et al., who determined a boiling temperature range of a mixture of four isomers at a single pressure during distillation of products of hydrogenation of acenaphthene, agree within less than 20% with the present vapor pressures even though the data by Schneider et al lie about 40 K below the lower limit of the present data. The data by Zakharkin et al deviate substantially from the data obtained by a long-range extrapolation of the Cox equation going to the pressure of 1 kPa. Boldt et al synthesized three of the six possible stereoisomers of perhydroacenaphthylene and reported their boiling points at a reduced pressure around 1 kPa obtained from temperature and pressure readings during distillation of a reaction product.…”

“…Percent in pressure deviation graph for the vapor pressure of perhydroacenaphthylene with the zero line representing eq 5 with the parameters of Table (Δ p = p Cox − p exp ): ○, this work; ◇, Grosse et al; □, Schneider et al; ▴, Zakharkin et al; ·, Boldt et al The dashed line connecting the adjacent points symbolizes the boiling range at a given pressure reported by the author.…”

“…Ebulliometric vapor pressure data determined in this work are included in the deviation plots to show their temperature range.

1 Percent in pressure deviation graph for the vapor pressure of perhydroacenaphthylene with the zero line representing eq 5 with the parameters of Table (Δ p = p Cox − p exp ): ○, this work; ◇, Grosse et al; □, Schneider et al; ▴, Zakharkin et al; ·, Boldt et al The dashed line connecting the adjacent points symbolizes the boiling range at a given pressure reported by the author.

2 Percent in pressure deviation graph for the vapor pressure of perhydrophenanthrene with the zero line representing eq 5 with the parameters of Table (Δ p = p Cox − p exp ): ○, this work; ◇, Pinkney et al; ▴, Durland and Adkins 2 ; □, Linstead and Walpole 3 ; *, Linstead; ▪, Grosse et al; shaded triangle, Boelhouwer et al; ▵, Schneider et al; shaded box, API RP 42; +, Eimasry and Gisvold; ×, Allinger et al 1 ; - - -, TRC Tables

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