@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 {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.}
}
@article {4764,
	title = {Competition between cyclization, cleavage, and reverse hydrogen transfer in 1,4-hydroxybiradicals: Crystal structure-solid state reactivity correlations},
	journal = {Organic Letters},
	volume = {2},
	number = {1},
	year = {2000},
	note = {ISI Document Delivery No.: 288GNTimes Cited: 14Cited Reference Count: 13},
	month = {Jan},
	pages = {77-80},
	type = {Article},
	abstract = {[GRAPHICS] To provide experimental evidence on the relationship between stucture and reactivity in 1,4-hydroxybiradical intermediates, the Norrish type II photochemistry of a homologous series of spirobenzoyladamantane derivatives was investigated in the crystalline state and the outcome correlated with the structures of the compounds as determined by X-ray crystallography. The results provide an unusually detailed and compelling picture of the geometric factors responsible for the partitioning of these reactive intermediates among cleavage, cyclization, and reverse hydrogen transfer.},
	keywords = {II REACTION, TETRAMETHYLENE},
	isbn = {1523-7060},
	url = {<Go to ISI>://000085554500021},
	author = {Cheung, E. and Netherton, M. R. and Scheffer, J. R. and Trotter, J.}
}
@article {4764,
	title = {Competition between cyclization, cleavage, and reverse hydrogen transfer in 1,4-hydroxybiradicals: Crystal structure-solid state reactivity correlations},
	journal = {Organic Letters},
	volume = {2},
	number = {1},
	year = {2000},
	note = {ISI Document Delivery No.: 288GNTimes Cited: 14Cited Reference Count: 13},
	month = {Jan},
	pages = {77-80},
	type = {Article},
	abstract = {[GRAPHICS] To provide experimental evidence on the relationship between stucture and reactivity in 1,4-hydroxybiradical intermediates, the Norrish type II photochemistry of a homologous series of spirobenzoyladamantane derivatives was investigated in the crystalline state and the outcome correlated with the structures of the compounds as determined by X-ray crystallography. The results provide an unusually detailed and compelling picture of the geometric factors responsible for the partitioning of these reactive intermediates among cleavage, cyclization, and reverse hydrogen transfer.},
	keywords = {II REACTION, TETRAMETHYLENE},
	isbn = {1523-7060},
	url = {<Go to ISI>://000085554500021},
	author = {Cheung, E. and Netherton, M. R. and Scheffer, J. R. and Trotter, J.}
}
@article {4763,
	title = {Latent chemical behavior revealed in the crystalline state: novel photochemistry of a cis-9-decalyl aryl ketone},
	journal = {Chemical Communications},
	number = {23},
	year = {2000},
	note = {ISI Document Delivery No.: 376ZLTimes Cited: 6Cited Reference Count: 12},
	pages = {2309-2310},
	type = {Article},
	abstract = {The case of a ketone whose photochemistry in solution is markedly different from that observed in the crystalline state is reported.},
	keywords = {HYDROGEN ATOM ABSTRACTION, II REACTION, MEDIA},
	isbn = {1359-7345},
	url = {<Go to ISI>://000165487300010},
	author = {Cheung, E. and Kang, T. and Scheffer, J. R. and Trotter, J.}
}
@article {4763,
	title = {Latent chemical behavior revealed in the crystalline state: novel photochemistry of a cis-9-decalyl aryl ketone},
	journal = {Chemical Communications},
	number = {23},
	year = {2000},
	note = {ISI Document Delivery No.: 376ZLTimes Cited: 6Cited Reference Count: 12},
	pages = {2309-2310},
	type = {Article},
	abstract = {The case of a ketone whose photochemistry in solution is markedly different from that observed in the crystalline state is reported.},
	keywords = {HYDROGEN ATOM ABSTRACTION, II REACTION, MEDIA},
	isbn = {1359-7345},
	url = {<Go to ISI>://000165487300010},
	author = {Cheung, E. and Kang, T. and Scheffer, J. R. and Trotter, J.}
}
@article {3828,
	title = {Zeolite as a host for chiral induction},
	journal = {Chemical Communications},
	number = {18},
	year = {1996},
	note = {ISI Document Delivery No.: VJ635Times Cited: 30Cited Reference Count: 21},
	month = {Sep},
	pages = {2159-2160},
	type = {Article},
	abstract = {By employing a strategy that involves the use of chirally modified zeolite as the reaction medium, modest enantioselectivity is achieved during photolysis of two ketones capable of undergoing the Norrish-Yang reaction.},
	keywords = {ALKYL PHENYL KETONES, BEHAVIOR, GAMMA-HYDROGEN ABSTRACTION, II REACTION, STATE},
	isbn = {1359-7345},
	url = {<Go to ISI>://A1996VJ63500025},
	author = {Sundarababu, G. and Leibovitch, M. and Corbin, D. R. and Scheffer, J. R. and Ramamurthy, V.}
}
