@article {4019, title = {Dimethyl 9,10-dihydro-9,10-ethenoanthracene-11-carboxylate-12S-carbono-thioate}, journal = {Acta Crystallographica Section C-Crystal Structure Communications}, volume = {53}, year = {1997}, note = {ISI Document Delivery No.: XR971Times Cited: 2Cited Reference Count: 12Part 8}, month = {Aug}, pages = {1162-1164}, type = {Article}, abstract = {The title molecule, C20H16O4S, contains a dibenzobarrelene skeleton, with normal geometry and dimensions. The carbomethoxy substituent is almost fully conjugated with the C11=C12 double bond [O=C-C=C torsion angle 171.3(2)degrees and cos(2)(angle) 0.98].}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-2701}, url = {://A1997XR97100077}, author = {Jones, R. and Rattray, A. G. M. and Scheffer, J. R. and Trotter, J.} } @article {4019, title = {Dimethyl 9,10-dihydro-9,10-ethenoanthracene-11-carboxylate-12S-carbono-thioate}, journal = {Acta Crystallographica Section C-Crystal Structure Communications}, volume = {53}, year = {1997}, note = {ISI Document Delivery No.: XR971Times Cited: 2Cited Reference Count: 12Part 8}, month = {Aug}, pages = {1162-1164}, type = {Article}, abstract = {The title molecule, C20H16O4S, contains a dibenzobarrelene skeleton, with normal geometry and dimensions. The carbomethoxy substituent is almost fully conjugated with the C11=C12 double bond [O=C-C=C torsion angle 171.3(2)degrees and cos(2)(angle) 0.98].}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-2701}, url = {://A1997XR97100077}, author = {Jones, R. and Rattray, A. G. M. and Scheffer, J. R. and Trotter, J.} } @article {3710, title = {Structures and photochemistry of 1,5-disubstituted dibenzobarrelenes}, journal = {Acta Crystallographica Section B-Structural Science}, volume = {52}, year = {1996}, note = {ISI Document Delivery No.: TZ494Times Cited: 1Cited Reference Count: 15Part 1}, month = {Feb}, pages = {151-158}, type = {Article}, abstract = {The effect of 1,5-disubstitution on the photochemistry of 9,10-ethenoanthracene-11,12-diesters has been studied and correlated with the crystal structures determined for several derivatives; photoproduct structures have been established from a crystal structure analysis of one of the products and from NMR correlations. The crystals studied are: (1)-Cl, dimethyl 1,5-dichloro-9,10-dihydro-9,10-ethenoanthracene-11 ,12-dicarboxylate, C20H14Cl2O4, P2(1)/n; (1)-CN, 1,5-dicyano derivative, C22H14N2O4, P2(1)/n; (1)-CN.0.5p-xylene, C22H14N2O4.0.5C(8)H(10), P2(1)/c; (1)-CN.xxylene, C22H14N2O4.xC(8)H(10), P2(1)/n; (1)-OMe, 1,5-dimethoxy derivative, C22H20O6, ; (2b)-Cl, C20H14Cl2O4, dimethyl 1,5-dichloro-4b,8b,8c,8d-tetrahydrodibenzo [a,f]cyclopropa[c,d]pentalene-8c,8d-dicarboxylate, Pna2(1). The dibenzobarrelene molecules all have geometries and dimensions similar to those of related materials. In particular, the orientations of the two ester groups in each molecule differ, one being in general almost fully conjugated with the C(11)=C(12) double bond and the other almost non-conjugated. Relationships are sought between the ratios of the two regioisomeric photoproducts and molecular and crystal structures; both electronic and steric effects are considered, but no one effect seems to dominate.}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS, PI-METHANE PHOTOREARRANGEMENT, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-7681}, url = {://A1996TZ49400019}, author = {Jones, R. and Rettig, S. J. and Scheffer, J. R. and Trotter, J. and Yang, J.} } @article {3710, title = {Structures and photochemistry of 1,5-disubstituted dibenzobarrelenes}, journal = {Acta Crystallographica Section B-Structural Science}, volume = {52}, year = {1996}, note = {ISI Document Delivery No.: TZ494Times Cited: 1Cited Reference Count: 15Part 1}, month = {Feb}, pages = {151-158}, type = {Article}, abstract = {The effect of 1,5-disubstitution on the photochemistry of 9,10-ethenoanthracene-11,12-diesters has been studied and correlated with the crystal structures determined for several derivatives; photoproduct structures have been established from a crystal structure analysis of one of the products and from NMR correlations. The crystals studied are: (1)-Cl, dimethyl 1,5-dichloro-9,10-dihydro-9,10-ethenoanthracene-11 ,12-dicarboxylate, C20H14Cl2O4, P2(1)/n; (1)-CN, 1,5-dicyano derivative, C22H14N2O4, P2(1)/n; (1)-CN.0.5p-xylene, C22H14N2O4.0.5C(8)H(10), P2(1)/c; (1)-CN.xxylene, C22H14N2O4.xC(8)H(10), P2(1)/n; (1)-OMe, 1,5-dimethoxy derivative, C22H20O6, ; (2b)-Cl, C20H14Cl2O4, dimethyl 1,5-dichloro-4b,8b,8c,8d-tetrahydrodibenzo [a,f]cyclopropa[c,d]pentalene-8c,8d-dicarboxylate, Pna2(1). The dibenzobarrelene molecules all have geometries and dimensions similar to those of related materials. In particular, the orientations of the two ester groups in each molecule differ, one being in general almost fully conjugated with the C(11)=C(12) double bond and the other almost non-conjugated. Relationships are sought between the ratios of the two regioisomeric photoproducts and molecular and crystal structures; both electronic and steric effects are considered, but no one effect seems to dominate.}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS, PI-METHANE PHOTOREARRANGEMENT, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-7681}, url = {://A1996TZ49400019}, author = {Jones, R. and Rettig, S. J. and Scheffer, J. R. and Trotter, J. and Yang, J.} } @article {3709, title = {Structures and photochemistry of dibenzobarrelene monoamides}, journal = {Acta Crystallographica Section B-Structural Science}, volume = {52}, year = {1996}, note = {ISI Document Delivery No.: WB469Times Cited: 2Cited Reference Count: 15Part 6}, month = {Dec}, pages = {1007-1013}, type = {Article}, abstract = {The photochemistry of 9,10-ethenoanthracene-11-monoamides has been studied and correlated with the crystal structures determined for two derivatives; photoproduct structures have been established from a crystal structure analysis of one of the products and from NMR correlations. Crystal data are: (1)-Et, N,N-diethyl-9,10-dihydro-9,10-ethenoanthracene-11-carboxamide, C21H21NO, Pbca; (1)-Pr, 9,10-dihydro-N,N-di(isopropyl)-9, 10-ethenoanthracene-11-carboxamide, C23H25NO, P2(1)/c; (2L)-Bz, 9,10-dihydro-9,10-ethenoanthracene-11-spiro-3{\textquoteright}-(1-benzyl-4-phenylazetidi ne)-2{\textquoteright}-one, C31H25NO (+ solvent), P2(1)/a (Z = 8). The two dibenzobarrelene molecules have geometries and dimensions similar to those of related materials; the amide group in each molecule is only partially conjugated with the C11=C12 double bond. Mechanism are derived for the formation of three types of photoproduct: (i) the well known di-pi-methane reaction [(2M)-type photoproduct]; (ii) a hydrogen abstraction process (2H); (iii) beta-lactam formation (2L).}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS}, isbn = {0108-7681}, url = {://A1996WB46900015}, author = {Jones, R. and Graham, A. and Rattray, M. and Rettig, S. J. and Scheffer, J. R. and Trotter, J.} } @article {3709, title = {Structures and photochemistry of dibenzobarrelene monoamides}, journal = {Acta Crystallographica Section B-Structural Science}, volume = {52}, year = {1996}, note = {ISI Document Delivery No.: WB469Times Cited: 2Cited Reference Count: 15Part 6}, month = {Dec}, pages = {1007-1013}, type = {Article}, abstract = {The photochemistry of 9,10-ethenoanthracene-11-monoamides has been studied and correlated with the crystal structures determined for two derivatives; photoproduct structures have been established from a crystal structure analysis of one of the products and from NMR correlations. Crystal data are: (1)-Et, N,N-diethyl-9,10-dihydro-9,10-ethenoanthracene-11-carboxamide, C21H21NO, Pbca; (1)-Pr, 9,10-dihydro-N,N-di(isopropyl)-9, 10-ethenoanthracene-11-carboxamide, C23H25NO, P2(1)/c; (2L)-Bz, 9,10-dihydro-9,10-ethenoanthracene-11-spiro-3{\textquoteright}-(1-benzyl-4-phenylazetidi ne)-2{\textquoteright}-one, C31H25NO (+ solvent), P2(1)/a (Z = 8). The two dibenzobarrelene molecules have geometries and dimensions similar to those of related materials; the amide group in each molecule is only partially conjugated with the C11=C12 double bond. Mechanism are derived for the formation of three types of photoproduct: (i) the well known di-pi-methane reaction [(2M)-type photoproduct]; (ii) a hydrogen abstraction process (2H); (iii) beta-lactam formation (2L).}, keywords = {CRYSTAL-STRUCTURE CORRELATIONS}, isbn = {0108-7681}, url = {://A1996WB46900015}, author = {Jones, R. and Graham, A. and Rattray, M. and Rettig, S. J. and Scheffer, J. R. and Trotter, J.} }