Dienophilic and dipolar additions to bicyclo[2.1.0]pent-2-ene
作者:Waldemar Adam、Axel Beinhauer、Ottorino De Lucchi、Robert J. Rosenthal
DOI:10.1016/s0040-4039(00)94185-6
日期:1983.1
dienophiles triazolinedione, singlet oxygen and in part tetracyanoethylene cyclo-add to bicyclo[2.1.0]pent-2-ene (1) across the central σ-bond to give bicyclo[2.2.1]heptene-type adducts, while the dipoles phenyl azide, benzonitrile oxide and diphenyldiazomethane cyclo-add at the π-bond with expected stereochemistry.
Dienophile cycloaddition to cycloheptatriene and related complexes of tricarbonyliron. X-Ray crystal structures of [Fe(CO)<sub>3</sub>(η<sup>4</sup>-C<sub>7</sub>H<sub>7</sub>CN)]·C<sub>2</sub>(CN)<sub>4</sub>and [ Fe(CO)<sub>3</sub>(η<sup>4</sup>-C<sub>7</sub>H<sub>7</sub>–C<sub>7</sub>H<sub>7</sub>)]
作者:Suman K. Chopra、Desmond Cunningham、Seamus Kavanagh、Patrick McArdle、Grainne Moran
DOI:10.1039/dt9870002927
日期:——
The rate of tetracyanoethene (tcne) addition to tricarbonyliron complexes of some substituted azepines and 1-cyanocycloheptatriene have been measured. Experimental support for a concerted mechanism for the cycloaddition of tcne to tricarbonyl(η4-cycloheptatriene) iron is provided by the high dienophile dependence of the observed reaction rate on chaning from tcne to tricyanoethene. Frontier orbital
Pressure effect on the rate and equilibrium constants of the Diels-Alder reaction 9-chloroanthracene with tetracyanoethylene
作者:Vladimir D. Kiselev、Elena A. Kashaeva、Alexander I. Konovalov
DOI:10.1016/s0040-4020(98)01093-x
日期:1999.1
The pressure effect on the forward and backward rateconstants and equilibrium constants of the Diels-Alder reaction of 9-chloroanthracene with tetracyanoethylene has been investigated in 1,2-dichloroethane up to 1000 kgcm−2 at 298.15 K. The reaction volume obtained from the pressure effect on equilibrium (−20.6 ±1.5 cm3mol−1) and as difference of activation volumes of forward (−28.5±1.5) and backward
研究了在1,2-二氯乙烷中,在298.15 K下高达1000 kgcm -2的条件下,压力对9-氯蒽与四氰乙烯的Diels-Alder反应的前后速率常数和平衡常数的影响。压力对平衡的影响(−20.6±1.5 cm 3 mol -1)和正向反应(−28.5±1.5)和反向反应(−6.5±0.5)的活化体积之差(−22.0±1.5 cm 3 mol -1)是与加合物(255.5±1.5),二烯(170.7±0.5)和亲二烯体(107.8±0.2)的部分摩尔体积差一致,给出了-23.0±2cm 3 mol -1。
Benzoquinones and related compounds. Part 4. Thermolysis of the Diels–Alder adduct of 2-acetyl-5,6-dichloro-1,4-benzoquinone and cyclopentadiene: evidence for a partial retro-diene reaction
作者:Roy L. Beddoes、J. Malcolm Bruce、Harry Finch、Leslie M. J. Heelam、Ian D. Hunt、Owen S. Mills
DOI:10.1039/p19810002670
日期:——
cyclopentadiene yields, predominantly, the 1:1 Diels–Alder adduct (6) by endo-addition to the 2,3-double bond. Thermolysis of this adduct in benzene results in disproportionation to cyclopentadiene and the spiro-acetal (13); thermolysis in acetic acid also yields (13), but the major product is the dihydrobenzofuran (14), an isomer of the Diels–Alder adduct. Mechanisms for the formation of these products are
Cyclopentadiene (Cpd) is widely used as a starting material in organic and inorganic chemistry. In neat form, Cpd dimerizes, making it necessary to distill it prior to use to obtain fully reactive material. We have screened three different tetraphenyladamantane octaethers for their ability to act as encapsulating organic crystal (EnOC) hosts for Cpd. To this end, we also synthesized 1,3,5,7-tetrakis(3