@article{an integrated approach to training graduate teaching assistants_2017, url={https://eric.ed.gov/?id=EJ1155397}, journal={Journal of College Science Teaching}, year={2017} } @misc{process for producing pure grade acrylic acid_1998, url={https://patents.google.com/patent/US5759358A/en}, year={1998}, month={Jun} } @article{casey_paulsen_beuttenmueller_proft_petrovich_matter_powell_1997, title={Electron Withdrawing Substituents on Equatorial and Apical Phosphines Have Opposite Effects on the Regioselectivity of Rhodium Catalyzed Hydroformylation}, url={http://dx.doi.org/10.1021/ja9719440}, DOI={10.1021/ja9719440}, abstractNote={The electronic effects of electron withdrawing aryl substituents on equatorial and apical diphosphines were investigated. Chelating diphosphines designed to coordinate in diequatorial or in apical−equatorial positions were synthesized, and their effects on the regioselectivity of rhodium catalyzed 1-hexene hydroformylation were observed. Only diequatorial coordination was observed for 2,2‘-bis[(diphenylphosphino)methyl]-1,1‘-biphenyl (BISBI) complexes (BISBI)Ir(CO)2H (8) and [BISBI-(3,5-CF3)]Ir(CO)2H (10), and only apical−equatorial coordination was seen for 1,2-bis(diphenylphosphino)ethane (DIPHOS) complexes (DIPHOS)Ir(CO)2H (14) and [DIPHOS-(3,5-CF3)]Ir(CO)2H (15). For the trans-1,2-bis[(diphenylphosphino)methyl]cyclopropane (T-BDCP) complexes, a mixture of diequatorial and apical−equatorial complexes was seen. For (T-BDCP)Ir(CO)2H (12), 12-ae was favored over 12-ee by 63:37, but for [T-BDCP-(3,5-CF3)]Ir(CO)2H (13) the conformational preference was reversed and a 10:90 ratio of 13-ae:13-ee was seen. The...}, author={Casey, Charles P. and Paulsen, Evelyn Lin and Beuttenmueller, Eckart W. and Proft, Bernd R. and Petrovich, Lori M. and Matter, Brock A. and Powell, Douglas R.}, year={1997} } @article{casey_petrovich_1995, title={(Chelating diphosphine)rhodium-Catalyzed Deuterioformylation of 1-Hexene: Control of Regiochemistry by the Kinetic Ratio of Alkylrhodium Species Formed by Hydride Addition to Complexed Alkene}, url={http://dx.doi.org/10.1021/ja00127a014}, DOI={10.1021/ja00127a014}, abstractNote={The deuterioformylation of 1-hexene catalyzed by (chelating diphosphine)rhodium catalysts gave nearly exclusive formation of CH{sub 3}(CH{sub 2}){sub 3}CHDCH{sub 2}CDO and CH{sub 3}(CH{sub 2}){sub 3}CH(CH{sub 2}D)CDO, with the deuterium label at the {beta}-carbon and at the aldehyde carbon. Very little deuterium was incorporated into recovered hexenes. These results establish that the regiochemistry of aldehyde formation is set by a largely irreversible addition of a rhodium hydride to complexed 1-hexene to produce an alkylrhodium intermediate that is committed to aldehyde formation. Plausible steric explanations for the increased n:i aldehyde regioselectivity seen for diequatorial chelates compared with apical-equatorial chelates are considered. However, such steric explanations are not supported by molecular mechanics calculations of probable transition states. 26 refs., 3 figs., 5 tabs.}, author={Casey, Charles P. and Petrovich, Lori M.}, year={1995} } @article{casey_whiteker_melville_petrovich_gavney_powell_1992, title={Diphosphines with natural bite angles near 120.degree. increase selectivity for n-aldehyde formation in rhodium-catalyzed hydroformylation}, url={http://dx.doi.org/10.1021/ja00040a008}, DOI={10.1021/ja00040a008}, abstractNote={The use of 2,2{prime}-bis[(diphenylphosphino)methyl]1,1{prime}-biphenyl (BISBI, 1), trans-1,2-bis[(diphenylphosphino)-methyl]cyclopropane (T-BDCP, 2), and other diphosphines with large natural bite angles as ligands in rhodium-catalyzed hydroformylation has been studied. The X-ray crystal structure of (BISBI)Rh(PPh{sub 3})(CO)H{center_dot}CH{sub 2}Cl{sub 2} (7{center_dot}CH{sub 2}Cl{sub 2}) indicated a trigonal bipyramidal structure with three phosphorus atoms in the equatorial plane. The P-Rh-P bite angle of the BISBI ligand in 7{center_dot}CH{sub 2}Cl{sub 2} of 124.8{degrees} is much smaller than the 152{degrees}P-Fe-P bite angle found in (BISBI)Fe(CO){sub 3} and indicates that the BISBI ligand is rather flexible. NMR studies indicate that rapid exchange ({Delta}G = 15.5 kcal mol{sup -1}) occurs between the coordinated PPh{sub 3} of 7 and free PPh{sub 3}. 7 reacted with CO to produce (BISBI)Rh(CO){sub 2}H(9), which was shown by IR and NMR studies to have a trigonal bipyramidal structure with BISBI in the equatorial plane and hydride in an apical position. The solution structures of the T-BDCP complexes (T-BDCP)Rh(PPh{sub 3})(CO)H(13) and (T-BDCP)Rh(CO){sub 2}H(14) were shown by spectroscopy to be similar to the related BISBI compounds. A correlation between the size of the natural bite angle of chelating diphosphines and the regioselectivity for formation of straight-chain aldehydes in the rhodium-catalyzed hydroformylation of 1-hexane was observed. 30 refs., 9 figs.,more » 2 tabs.« less}, author={Casey, Charles P. and Whiteker, Gregory T. and Melville, Margaret G. and Petrovich, Lori M. and Gavney, James A. and Powell, Douglas R.}, year={1992} } @article{casey_whiteker_melville_petrovich_gavney_powell_1992, title={Diphosphines with natural bite angles near 120.degree. increase selectivity for n-aldehyde formation in rhodium-catalyzed hydroformylation. [Erratum to document cited in CA117(3):25899x]}, url={http://dx.doi.org/10.1021/ja00052a099}, DOI={10.1021/ja00052a099}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiphosphines with natural bite angles near 120.degree. increase selectivity for n-aldehyde formation in rhodium-catalyzed hydroformylation. [Erratum to document cited in CA117(3):25899x]Charles P. Casey, Gregory T. Whiteker, Margaret G. Melville, Lori M. Petrovich, James A. Gavney Jr., and Douglas R. PowellCite this: J. Am. Chem. Soc. 1992, 114, 26, 10680Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https://doi.org/10.1021/ja00052a099Request reuse permissionsArticle Views134Altmetric-Citations8LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (145 KB) Get e-Alertsclose Get e-Alerts}, author={Casey, Charles P. and Whiteker, Gregory T. and Melville, Margaret G. and Petrovich, Lori M. and Gavney, James A. and Powell, Douglas R.}, year={1992} } @article{casey_wang_petrovich_underiner_hazin_desper_1992, title={Metal insertion into a CH bond as a route to the heterobimetallic μ-methylidene complex C5H5(CO)2Re(μ-CH2)Pt(PPh3)2}, url={http://dx.doi.org/10.1016/s0020-1693%2800%2992399-5}, DOI={10.1016/s0020-1693(00)92399-5}, abstractNote={Abstract The reaction of C 5 H 5 (CO) 2 Re(CH 3 )−Li + -THF ( 5 ) with (Ph 3 P) 3 Pt[( E )-C(CH 3 )CHCH 3 ] + CF 3 SO 3 − ( 3E ) in an attempt to prepare the heterobimetallic complex C 5 H 5 (CO) 2 (CH 3 )RePt[( E )-C(CH 3 )CHCH 3 ](PPh 3 ) 2 ( B ) led to the formation of the new heterobimetallic μ-methylene complex C 5 H 5 (CO) 2 Re(μ-Ch 2 )Pt(PPh 3 ) 2 ( 4 ), which was characterized by X-ray crystallography. A mechanism involving initial generation of intermediate B followed by insertion of Pt into a CH bond and reductive elimination is suggested. The related substituted alkylidene complexes C 5 H 5 (CO) 2 Re[μ-CH( E -CH 3 CCHCH 3 )]Pt(PPh 3 ) 2 ( 9 ) and C 5 H 5 (CO) 2 Re(μ-CHCH 3 )Pt(PPh 3 ) 2 ( 11 ) were prepared from Pt(C 2 -H 4 )(PPh 3 ) 2 and the appropriate rhenium alkylidene complexes C 5 H 5 (CO) 2 ReCHR.}, author={Casey, Charles P. and Wang, Yan and Petrovich, Lori M. and Underiner, Todd L. and Hazin, Paulette N. and Desper, John M.}, year={1992} } @article{vance_prins_hauger_wemple_pederson_kort_kannisto_geerligs_kelly_1991, title={Effect of allyl methyl substituents on the preparation, dynamics, and reactivity of zirconium complexes (.eta.5-C5Me5)(allyl)ZrX2 (X = Cl, Br): structure of (.eta.5-C5Me5)(C3H5)ZrCl2 and (.eta.5-C5Me5)(1,2-Me2(butadiene))(.eta.2-CH2PPh2)Zr. Dynamics of (.eta.5-C5Me5)(2,3-Me2(butadiene))(.eta.2-CH2PPh2)Zr}, url={http://dx.doi.org/10.1021/om00050a023}, DOI={10.1021/om00050a023}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of allyl methyl substituents on the preparation, dynamics, and reactivity of zirconium complexes (.eta.5-C5Me5)(allyl)ZrX2 (X = Cl, Br): structure of (.eta.5-C5Me5)(C3H5)ZrCl2 and (.eta.5-C5Me5)(1,2-Me2(butadiene))(.eta.2-CH2PPh2)Zr. Dynamics of (.eta.5-C5Me5)(2,3-Me2(butadiene))(.eta.2-CH2PPh2)ZrPeter J. Vance, Thomas J. Prins, Bryan E. Hauger, Michael E. Wemple, Lori M. Pederson, David A. Kort, Michael R. Kannisto, Steven J. Geerligs, Richard S. Kelly, and Cite this: Organometallics 1991, 10, 4, 917–924Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://doi.org/10.1021/om00050a023RIGHTS & PERMISSIONSArticle Views71Altmetric-Citations14LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (1 MB) Get e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts}, author={Vance, Peter J. and Prins, Thomas J. and Hauger, Bryan E. and Wemple, Michael E. and Pederson, Lori M. and Kort, David A. and Kannisto, Michael R. and Geerligs, Steven J. and Kelly, Richard S.}, year={1991} } @article{casey_askham_petrovich_1990, title={A new route to early-late heterobimetallic μ-alkylidene complexes}, url={http://dx.doi.org/10.1016/0022-328x%2890%2987188-j}, DOI={10.1016/0022-328x(90)87188-j}, abstractNote={Abstract The reaction of two equivalents of Cp 2 ZrHCl ( 1 ) with Cp(CO) 2 ReCHR ( 2 , R = CH 2 CH 2 CMe 3 ; 4 , R = CH 3 ) led to the formation of the heterobimetallic μ-alkylidene complexes Cp 2 Zr(μ-CHR)(μ,η 1 ,η 2 -CO)Re(CO)Cp ( 3 , R = CH 2 CH 2 CMe 3 ; 5 , R = CH 3 ).}, author={Casey, Charles P. and Askham, Fredric R. and Petrovich, Lori M.}, year={1990} } @article{larson_van dort_lakanen_daniel w. o'neill_pederson_mccandless_silver_russo_huffman_1988, title={Factors determining allyl hapticity in early-transition-metal allyl complexes: synthesis, structure, and dynamics of Cp2(.eta.3-1,2,3-trimethylallyl)ZrBr and Cp2(.eta.1-1,1,2-trimethylallyl)ZrBr}, url={http://dx.doi.org/10.1021/om00095a026}, DOI={10.1021/om00095a026}, abstractNote={Le complexe du zirconium Cp 2 ZrCl 2 reagit avec le trimethyl-1,1,2 allyl magnesium pour donner Cp 2 (η 1 -[trimethyl-1,1,2 allyl])ZrBr et Cp 2 (η 3 -[dimethyl-1,2 butene-2yl]). La structure cristalline de ces complexes est effectuee}, author={Larson, Erlund J. and Van Dort, Paul C. and Lakanen, John R. and Daniel W. O'Neill and Pederson, Lori M. and McCandless, Jill J. and Silver, Michael E. and Russo, Steven O. and Huffman, John C.}, year={1988} } @article{larson_van dort_dailey_lakanen_pederson_silver_huffman_russo_1987, title={Thermally stable allylzirconium halide compounds. Synthesis, crystal structure, and dynamics of (.eta.5-C5Me5)(.eta.3-1,2,3-trimethylallyl)ZrBr2 and (.eta.5-C5Me5)(.eta.3-1,1,2-trimethylallyl)ZrBr2}, url={http://dx.doi.org/10.1021/om00153a019}, DOI={10.1021/om00153a019}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally stable allylzirconium halide compounds. Synthesis, crystal structure, and dynamics of (.eta.5-C5Me5)(.eta.3-1,2,3-trimethylallyl)ZrBr2 and (.eta.5-C5Me5)(.eta.3-1,1,2-trimethylallyl)ZrBr2Erlund J. Larson, Paul C. Van Dort, James S. Dailey, John R. Lakanen, Lori M. Pederson, Michael E. Silver, John C. Huffman, and Steven O. RussoCite this: Organometallics 1987, 6, 10, 2141–2146Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://doi.org/10.1021/om00153a019RIGHTS & PERMISSIONSArticle Views270Altmetric-Citations17LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (880 KB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts}, author={Larson, Erlund J. and Van Dort, Paul C. and Dailey, James S. and Lakanen, John R. and Pederson, Lori M. and Silver, Michael E. and Huffman, John C. and Russo, Steven O.}, year={1987} }