@article {1610,
	title = {Monitoring reaction centers and molecules during an enantioselective photoreaction in a crystal},
	journal = {Crystengcomm},
	volume = {8},
	number = {8},
	year = {2006},
	note = {ISI Document Delivery No.: 071LZTimes Cited: 9Cited Reference Count: 19Turowska-Tyrk, Ilona Bakowicz, Julia Scheffer, John R. Xia, Wujiong},
	pages = {616-621},
	type = {Article},
	abstract = {The single crystal-to-single crystal retro-Claisen photorearrangement of the salt of 7-(4-carboxybenzoyl) norbornene with (S)-(2)-1-cyclohexylethylamine was studied. Although this reaction is an ionic chiral auxiliary-mediated asymmetric synthesis, which normally affords highly enantio-enriched products, the enantiomeric excess in this case is a relatively low 60\% (80\% of one enantiomer, 20\% of the other). X-ray structure analysis was used in order to describe changes in the reaction centers and the behavior of molecules during the photoreaction and to understand the formation of two enantiomers. It was discovered that the conformation of the reactant molecules changes during the photoreaction to one that enables the formation of the minor enantiomer. This was seen clearly at ca. 30\% reaction progress. The variations in the cell constants as a function of reaction progress are also presented. The structural changes taking place during the retro-Claisen photorearrangement are compared to the changes observed for other intra- and intermolecular photoreactions in crystals.},
	keywords = {2-BENZYL-5-BENZYLIDENECYCLOPENTANONE, ASYMMETRIC INDUCTION, PHOTODIMERIZATION, SOLID-STATE, STRUCTURAL TRANSFORMATIONS, Yang photocyclization},
	isbn = {1466-8033},
	url = {<Go to ISI>://000239605000007},
	author = {Turowska-Tyrk, I. and Bakowicz, J. and Scheffer, J. R. and Xia, W. J.}
}
@article {1611,
	title = {Monitoring structural transformations in crystals. 8. Monitoring molecules and a reaction center during a solid-state Yang photocyclization},
	journal = {Acta Crystallographica Section B-Structural Science},
	volume = {62},
	year = {2006},
	note = {ISI Document Delivery No.: 018ZGTimes Cited: 19Cited Reference Count: 22Part 1},
	month = {Feb},
	pages = {128-134},
	type = {Article},
	abstract = {Structural changes taking place in a crystal during an intramolecular photochemical reaction [ the Yang photocyclization of the alpha- methylbenzylamine salt with 1-( 4- carboxybenzoyl)1- methyladamantane] were monitored step- by- step using X- ray structure analysis. This is the first example of such a study carried out for an intramolecular photochemical reaction. During the photoreaction, both the reactant and product molecules change their orientation, but the reactant changes more rapidly after the reaction is about 80\% complete. The distance between directly reacting atoms in the reactant molecule is almost constant until about 80\% reaction progress and afterwards decreases. The torsion angle defined by the reactant atoms that form the cyclobutane ring also changes in the final stages of the photoreaction. These phenomena are explained in terms of the influence of many product molecules upon a small number of reacting molecules. The adamantane portion shifts more than the remaining part of the anionic reactant species during the reaction, which is explained in terms of hydrogen bonding. The structural changes are accompanied by changes in the cell constants. The results obtained in the present study are compared with analogous results published for intermolecular reactions.},
	keywords = {INCLUSION CRYSTALS, PHOTO-DIMERIZATION, PHOTODIMERIZATION, SINGLE-CRYSTAL, X-RAY},
	isbn = {0108-7681},
	url = {<Go to ISI>://000235803600014},
	author = {Turowska-Tyrk, I. and Trzop, E. and Scheffer, J. R. and Chen, S.}
}
@article {818,
	title = {The crystal structure of a simple enol formed in a single-crystal-to-single-crystal enolene rearrangement},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {82},
	number = {2},
	year = {2004},
	note = {ISI Document Delivery No.: 802BHTimes Cited: 1Cited Reference Count: 15},
	month = {Feb},
	pages = {301-305},
	type = {Article},
	abstract = {When crystals of 9-tricyclo[4.4.1.0]undecalyl-4-(carbomethoxy)phenyl ketone (1) were allowed to stand in the dark for extended periods of time at room temperature, the compound underwent a thermal reaction - the enolene rearrangement - to afford enol 2. The crystals remained transparent and appeared unchanged in shape as the reaction proceeded. X-ray diffraction data were collected on single crystals containing 17\%, 25\%, 66\%, and 100\% of the enol. The crystal structure of a simple enol was obtained via this novel single-crystal-to-single-crystal enolene rearrangement.},
	keywords = {enol, enolene, HYDROGEN-ATOM ABSTRACTION, PHOTODIMERIZATION, REARRANGEMENT, single crystal, STATE, thermal},
	isbn = {0008-4042},
	url = {<Go to ISI>://000220138500026},
	author = {Chong, K. C. W. and Patrick, B. O. and Scheffer, J. R.}
}
@article {4054,
	title = {Determination of the absolute steric course of are enantioselective single crystal-to-single crystal photorearrangement},
	journal = {Journal of the American Chemical Society},
	volume = {119},
	number = {6},
	year = {1997},
	note = {ISI Document Delivery No.: WH326Times Cited: 27Cited Reference Count: 25},
	month = {Feb},
	pages = {1462-1463},
	type = {Article},
	keywords = {ASYMMETRIC-SYNTHESIS, PHOTOCHEMISTRY, PHOTODIMERIZATION, SOLID-STATE POLYMERIZATION},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1997WH32600039},
	author = {Leibovitch, M. and Olovsson, G. and Scheffer, J. R. and Trotter, J.}
}
@article {4054,
	title = {Determination of the absolute steric course of are enantioselective single crystal-to-single crystal photorearrangement},
	journal = {Journal of the American Chemical Society},
	volume = {119},
	number = {6},
	year = {1997},
	note = {ISI Document Delivery No.: WH326Times Cited: 27Cited Reference Count: 25},
	month = {Feb},
	pages = {1462-1463},
	type = {Article},
	keywords = {ASYMMETRIC-SYNTHESIS, PHOTOCHEMISTRY, PHOTODIMERIZATION, SOLID-STATE POLYMERIZATION},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1997WH32600039},
	author = {Leibovitch, M. and Olovsson, G. and Scheffer, J. R. and Trotter, J.}
}
