@article {3974, title = {4-[2,4,6-tris(1-methylethyl)benzoyl]benzoic acid (S)-(-)-proline}, journal = {Acta Crystallographica Section C-Crystal Structure Communications}, volume = {53}, year = {1997}, note = {ISI Document Delivery No.: XZ627Times Cited: 2Cited Reference Count: 13Part 9}, month = {Sep}, pages = {1259-1262}, type = {Article}, abstract = {The title compound, C23H28O3.C5H9NO2, is a 1:1 complex of the benzoic acid derivative and the (S)-proline zwitterion, with two formula units in the asymmetric unit (with pseudo-symmetry relationships between the separate components). The ketone carbonyl group in each benzoic acid molecule deviates slightly from a position normal to the plane of the triisopropylphenyl ring; the deviations (of about 16 degrees) are in opposite senses in the two molecules, so that the molecules have opposite conformational chiralities, leading to a nearly racemic photoproduct on solid-state photolysis.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, CRYSTAL-STRUCTURES, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-2701}, url = {://A1997XZ62700042}, author = {Fu, T. Y. and Scheffer, J. R. and Trotter, J.} } @article {3974, title = {4-[2,4,6-tris(1-methylethyl)benzoyl]benzoic acid (S)-(-)-proline}, journal = {Acta Crystallographica Section C-Crystal Structure Communications}, volume = {53}, year = {1997}, note = {ISI Document Delivery No.: XZ627Times Cited: 2Cited Reference Count: 13Part 9}, month = {Sep}, pages = {1259-1262}, type = {Article}, abstract = {The title compound, C23H28O3.C5H9NO2, is a 1:1 complex of the benzoic acid derivative and the (S)-proline zwitterion, with two formula units in the asymmetric unit (with pseudo-symmetry relationships between the separate components). The ketone carbonyl group in each benzoic acid molecule deviates slightly from a position normal to the plane of the triisopropylphenyl ring; the deviations (of about 16 degrees) are in opposite senses in the two molecules, so that the molecules have opposite conformational chiralities, leading to a nearly racemic photoproduct on solid-state photolysis.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, CRYSTAL-STRUCTURES, SOLID-STATE PHOTOCHEMISTRY}, isbn = {0108-2701}, url = {://A1997XZ62700042}, author = {Fu, T. Y. and Scheffer, J. R. and Trotter, J.} } @article {3675, title = {Crystal structure-reactivity relationships in the solid state photochemistry of 2,4,6-triisopropylthiobenzophenone: C=O...H versus C=S...H abstraction geometry}, journal = {Tetrahedron Letters}, volume = {37}, number = {13}, year = {1996}, note = {ISI Document Delivery No.: UC590Times Cited: 6Cited Reference Count: 19}, month = {Mar}, pages = {2125-2128}, type = {Article}, abstract = {X-ray crystal structure solid state photoreactivity correlations are reported for 2,4,6-triisopropylthiobenzophenone (1a) and its p-methoxy derivative 1b. The results reveal interesting differences in the geometry of gamma-hydrogen atom abstraction for ketones and thiones.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, CONFORMATION, KETONES, PHOTOCYCLIZATION, TRIPLET-STATES}, isbn = {0040-4039}, url = {://A1996UC59000003}, author = {Fu, T. Y. and Scheffer, J. R. and Trotter, J.} } @article {3675, title = {Crystal structure-reactivity relationships in the solid state photochemistry of 2,4,6-triisopropylthiobenzophenone: C=O...H versus C=S...H abstraction geometry}, journal = {Tetrahedron Letters}, volume = {37}, number = {13}, year = {1996}, note = {ISI Document Delivery No.: UC590Times Cited: 6Cited Reference Count: 19}, month = {Mar}, pages = {2125-2128}, type = {Article}, abstract = {X-ray crystal structure solid state photoreactivity correlations are reported for 2,4,6-triisopropylthiobenzophenone (1a) and its p-methoxy derivative 1b. The results reveal interesting differences in the geometry of gamma-hydrogen atom abstraction for ketones and thiones.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, CONFORMATION, KETONES, PHOTOCYCLIZATION, TRIPLET-STATES}, isbn = {0040-4039}, url = {://A1996UC59000003}, author = {Fu, T. Y. and Scheffer, J. R. and Trotter, J.} } @article {3082, title = {IONIC CHIRAL HANDLE-INDUCED ASYMMETRIC-SYNTHESIS IN A SOLID-STATE NORRISH TYPE-II PHOTOREACTION}, journal = {Tetrahedron-Asymmetry}, volume = {5}, number = {8}, year = {1994}, note = {ISI Document Delivery No.: PC678Times Cited: 22Cited Reference Count: 9}, month = {Aug}, pages = {1415-1418}, type = {Article}, abstract = {Irradiation of crystals of salts formed between 4-(2,4,6-triisopropylbenzoyl)benzoic acid (1a) and various optically active amines is shown to lead to optically active Norrish type II photoproducts in low to moderate enantiomeric excesses, a process in which the ammonium ion has acted as an {\textquoteright}{\textquoteright}ionic chiral handle.{\textquoteright}{\textquoteright} X-ray crystallography reveals that the salts crystallize with two independent, mirror image-related molecules of the benzophenone moiety in the asymmetric unit, and this is suggested to be the source of the low ees observed.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, INDUCTION, PHOTOCHEMISTRY, SALTS}, isbn = {0957-4166}, url = {://A1994PC67800004}, author = {Koshima, H. and Maeda, A. and Masuda, N. and Matsuura, T. and Hirotsu, K. and Okada, K. and Mizutari, H. and Ito, Y. and Fu, T. Y. and Scheffer, J. R. and Trotter, J.} } @article {3082, title = {IONIC CHIRAL HANDLE-INDUCED ASYMMETRIC-SYNTHESIS IN A SOLID-STATE NORRISH TYPE-II PHOTOREACTION}, journal = {Tetrahedron-Asymmetry}, volume = {5}, number = {8}, year = {1994}, note = {ISI Document Delivery No.: PC678Times Cited: 22Cited Reference Count: 9}, month = {Aug}, pages = {1415-1418}, type = {Article}, abstract = {Irradiation of crystals of salts formed between 4-(2,4,6-triisopropylbenzoyl)benzoic acid (1a) and various optically active amines is shown to lead to optically active Norrish type II photoproducts in low to moderate enantiomeric excesses, a process in which the ammonium ion has acted as an {\textquoteright}{\textquoteright}ionic chiral handle.{\textquoteright}{\textquoteright} X-ray crystallography reveals that the salts crystallize with two independent, mirror image-related molecules of the benzophenone moiety in the asymmetric unit, and this is suggested to be the source of the low ees observed.}, keywords = {2, 4, 6-TRIISOPROPYLBENZOPHENONES, INDUCTION, PHOTOCHEMISTRY, SALTS}, isbn = {0957-4166}, url = {://A1994PC67800004}, author = {Koshima, H. and Maeda, A. and Masuda, N. and Matsuura, T. and Hirotsu, K. and Okada, K. and Mizutari, H. and Ito, Y. and Fu, T. Y. and Scheffer, J. R. and Trotter, J.} }