@article {1064,
	title = {Molecular mechanics-assisted crystal engineering of solid state photoreactions: application to the Yang photocyclization of alpha-1-norbornylacetophenone derivatives},
	journal = {Tetrahedron Letters},
	volume = {46},
	number = {7},
	year = {2005},
	note = {ISI Document Delivery No.: 895FRTimes Cited: 3Cited Reference Count: 11},
	month = {Feb},
	pages = {1141-1144},
	type = {Article},
	abstract = {Based on molecular mechanics, Yang photocyclization of alpha-1-norbornylacetophenone derivatives in the crystalline state was engineered through methylation adjacent to the carbonyl group, thus changing the conformation in the crystal and leading to enhanced diastereo- and enantioselectivity. (C) 2004 Elsevier Ltd. All rights reserved.},
	keywords = {ASYMMETRIC INDUCTION, crystal engineering, GEOMETRIC REQUIREMENTS, II REACTION, ionic chiral auxiliaries, REACTIVITY, solid state photochemistry, X-RAY CRYSTALLOGRAPHY, Yang photocyclization},
	isbn = {0040-4039},
	url = {<Go to ISI>://000226846800021},
	author = {Botoshansky, M. and Braga, D. and Kaftory, M. and Maini, L. and Patrick, B. O. and Scheffer, J. R. and Wang, K. Y.}
}
@article {811,
	title = {1,4-hydroxybiradical behavior revealed through crystal structure - Solid-state reactivity correlations},
	journal = {Journal of the American Chemical Society},
	volume = {126},
	number = {11},
	year = {2004},
	note = {ISI Document Delivery No.: 804GETimes Cited: 21Cited Reference Count: 27},
	month = {Mar},
	pages = {3511-3520},
	type = {Article},
	abstract = {Structure- reactivity correlations for triplet 1,4-hydroxybiradicals in solution are made difficult by the presence of multiple reactive conformers and the possibility of conformation-dependent intersystem crossing. These problems can be overcome by working in the crystalline state, where the conformations of the 1,4-hydroxybiradicals are fixed and determinable by X-ray crystallography of the parent ketones, assuming that hydrogen atom abstraction occurs with little or no change in conformation. This approach is applied to 15 bi- and tricyclic ketones designed to have slightly different biradical conformations, so that the effect of small and incremental changes in geometry on biradical behaviour can be tested. The results indicate that, while geometry does have a strong influence on 1,4-hydroxybiradical partitioning between cyclization, cleavage, and reverse hydrogen transfer, a full understanding of the results requires that the strain involved in forming the cyclization products be taken into account.},
	keywords = {4-BIRADICALS, BIRADICALS, CONFORMATIONAL MEMORY, GEOMETRIC REQUIREMENTS, II REACTION, ORGANIC-SYNTHESIS, PHENYL KETONES, PHOTOCHEMISTRY, PHOTOCYCLIZATION, STEREOSELECTIVITY, TRIPLET 1},
	isbn = {0002-7863},
	url = {<Go to ISI>://000220286400046},
	author = {Braga, D. and Chen, S. and Filson, H. and Maini, L. and Netherton, M. R. and Patrick, B. O. and Scheffer, J. R. and Scott, C. and Xia, W. J.}
}
@article {710,
	title = {Preorganization of achiral molecules for asymmetric synthesis through crystallization-induced immobilization in homochiral conformations},
	journal = {Angewandte Chemie-International Edition},
	volume = {42},
	number = {32},
	year = {2003},
	note = {ISI Document Delivery No.: 716PRTimes Cited: 19Cited Reference Count: 24},
	pages = {3775-3777},
	type = {Article},
	keywords = {asymmetric synthesis, CRYSTAL, crystal engineering, GEOMETRIC REQUIREMENTS, II, INDUCTION, KETONES, PHOTOCHEMICAL-REACTIONS, PHOTOCHEMISTRY, PHOTOCYCLIZATION, reaction, REACTIONS, REACTIVITY, SOLID-STATE, topochemistry},
	isbn = {1433-7851},
	url = {<Go to ISI>://000185038000009},
	author = {Patrick, B. O. and Scheffer, J. R. and Scott, C.}
}
@article {459,
	title = {Control of enantioselectivity in the photochemical conversion of alpha-oxoamides into beta-lactam derivatives},
	journal = {Organic Letters},
	volume = {4},
	number = {9},
	year = {2002},
	note = {ISI Document Delivery No.: 545XYTimes Cited: 19Cited Reference Count: 34},
	month = {May},
	pages = {1443-1446},
	type = {Article},
	abstract = {[GRAPHIC] Several approaches to asymmetric induction in the alpha-oxoamide (1) to beta-lactam (2) photorearrangement are described. Best results are obtained via irradiation of ionic and covalent chiral auxiliary-containing reactants in the crystalline state and in the interior supercages of zeolites.},
	keywords = {AMINO-ACID, ASYMMETRIC INDUCTION, CATION-PI INTERACTIONS, CRYSTALLINE STATE, GAS-PHASE, GEOMETRIC REQUIREMENTS, II, PHOTOCYCLIZATION, REACTIONS, SOLID-STATE PHOTOCHEMISTRY, ZWITTERIONS},
	isbn = {1523-7060},
	url = {<Go to ISI>://000175243900009},
	author = {Natarajan, A. and Wang, K. and Ramamurthy, V. and Scheffer, J. R. and Patrick, B.}
}
@article {532,
	title = {Enhanced regioselectivity of Yang photocyclization in the crystalline state},
	journal = {Organic Letters},
	volume = {4},
	number = {7},
	year = {2002},
	note = {ISI Document Delivery No.: 536BDTimes Cited: 9Cited Reference Count: 13},
	month = {Apr},
	pages = {1071-1074},
	type = {Article},
	abstract = {[GRAPHICS] In contrast to the solution state, where Yang photocyclization of ketones of general structure 1 leads to equal amounts of cyclobutanols 2 and 3 (by abstraction of H-A and H-B, respectively), irradiation in the crystalline state is much more regioselective, favoring either 2 or 3 depending on the nature of the substituent X. X-ray crystallography and molecular mechanics calculations reveal the source of this remarkable solid-state regioselectivity.},
	keywords = {ABSTRACTION, GAMMA, GEOMETRIC REQUIREMENTS, II REACTION, PHOTOCHEMISTRY, SOLID-STATE},
	isbn = {1523-7060},
	url = {<Go to ISI>://000174680100006},
	author = {Vishnumurthy, K. and Cheung, E. and Scheffer, J. R. and Scott, C.}
}
@article {5185,
	title = {2000 Alfred Bader Award Lecture - In the footsteps of Pasteur: asymmetric induction in the photochemistry of crystalline ammonium carboxylate salts},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {79},
	number = {4},
	year = {2001},
	note = {ISI Document Delivery No.: 429PNTimes Cited: 51Cited Reference Count: 52},
	month = {Apr},
	pages = {349-357},
	type = {Article},
	abstract = {This review describes the development of a new, synthetically useful method of asymmetric synthesis in organic photochemistry. Similar in many ways to the Pasteur procedure for resolving racemic carboxylic acids and organic amines, the method relies on the use of crystalline organic salts in which the enantioselectivity of a photochemical reaction of an achiral organic ion (for example, a carboxylate anion) is governed in the solid state by the presence of an optically pure counterion (for example, an optically active ammonium ion). Such optically pure counterions are termed ionic chiral auxiliaries. Salts containing ionic chiral auxiliaries are required to crystallize in chiral space groups, which provide the asymmetric environment necessary for chiral induction. Using this methodology, we have obtained near-quantitative optical yields in a wide variety of photochemical reactions.},
	keywords = {ABSOLUTE-CONFIGURATION CORRELATION, ACID-DERIVATIVES, asymmetric synthesis, chiral auxiliaries, crystal structure-reactivity relationships, di-pi-methane, GEOMETRIC REQUIREMENTS, II REACTION, ionic chiral auxiliaries, ORGANIC-PHOTOCHEMISTRY, PHOTOCHEMISTRY, solid state, SOLID-STATE PHOTOCHEMISTRY, STRUCTURE-REACTIVITY RELATIONSHIPS, YANG PHOTOCYCLIZATION REACTION},
	isbn = {0008-4042},
	url = {<Go to ISI>://000168526300001},
	author = {Scheffer, J. R.}
}
