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Relevant bibliographies by topics / Secondary P-deuterium isotope effects

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Academic literature on the topic 'Secondary P-deuterium isotope effects'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Secondary P-deuterium isotope effects"

1

Koerner, Terry, Kenneth Charles Westaway, Raymond A. Poirier та Y. Wang. "An unusually large secondary α-deuterium kinetic isotope effect in hydride ion SN2 reactions". Canadian Journal of Chemistry 78, № 8 (2000): 1067–72. http://dx.doi.org/10.1139/v00-100.

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Theoretical calculations at the HF/6-31+G* level suggest the secondary α-deuterium kinetic isotope effects for hydride ion SN2 reactions are much larger than expected for the structure of the transition state. The secondary α-deuterium kinetic isotope effects for the SN2 reactions between sodium borohydride (hydride ion) and para-methyl- and para-chlorobenzyl chlorides are much larger than expected as the theoretical calculations suggest. It appears the secondary α-deuterium isotope effects are larger than expected for the structure of the SN2 transition state because the hydride ion is too sm

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2

Choi, Hyung Soo, and Robert L. Kuczkowski. "Ozonolysis of styrene and p-nitrostyrene. Secondary deuterium isotope effects." Journal of Organic Chemistry 50, no. 6 (1985): 901–2. http://dx.doi.org/10.1021/jo00206a042.

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3

Smith, Peter James, David AJ Crowe, and Kenneth Charles Westaway. "Using secondary alpha deuterium kinetic isotope effects to determine the stereochemistry of an E2 reaction; the stereochemistry of the E2 reaction of 1-chloro-2-phenylethane with potassium tert-butoxide in tert-butyl alcohol." Canadian Journal of Chemistry 79, no. 7 (2001): 1145–52. http://dx.doi.org/10.1139/v01-086.

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Isotopic labelling studies have shown that the E2 reaction of 1-chloro-2-phenylethane with potassium tert-butoxide in tert-butyl alcohol occurs via an anti-periplanar stereochemistry. This demonstrates that the different secondary alpha deuterium kinetic isotope effects found for the high and low base concentrations and in the presence of 18-crown-6 ether are because of changes in transition state structure that occur when the form of the reacting base changes rather than to a change in the stereochemistry of the reaction.Key words: E2 reaction, stereochemistry, secondary alpha deuterium kinet

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4

Alston, William C., Kari Haley, Ryszard Kanski, Christopher J. Murray, and Julianto Pranata. "Secondary Deuterium Isotope Effects for Enolization Reactions." Journal of the American Chemical Society 118, no. 28 (1996): 6562–69. http://dx.doi.org/10.1021/ja942053k.

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5

Pham, T. V., and K. C. Westaway. "Solvent effects on nucleophilic substitution reactions. III. The effect of adding an inert salt on the structure of the SN2 transition state." Canadian Journal of Chemistry 74, no. 12 (1996): 2528–30. http://dx.doi.org/10.1139/v96-283.

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The nitrogen and secondary α-hydrogen–deuterium kinetic isotope effects found for the SN2 reaction between thiophenoxide ion and benzyldimethylphenylammonium ion at different ionic strengths in DMF at 0 °C indicate that the structure of the transition state changes markedly with the ionic strength of the reaction mixture. In fact, a more reactant-like, more ionic, transition state is found at the higher ionic strength. This presumably occurs because a more ionic transition state is more stable in the more ionic solvent. Key words: transition state, ionic strength, secondary α deuterium kinetic

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6

Fang, Yao-Ren, and Kenneth Charles Westaway. "Isotope effects in nucleophilic substitution reactions. VIII. The effect of the form of the reacting nucleophile on the transition state structure of an SN2 reaction." Canadian Journal of Chemistry 69, no. 6 (1991): 1017–21. http://dx.doi.org/10.1139/v91-149.

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A spectroscopic investigation indicated that lithium thiophenoxide exists as a contact ion pair complex in dry diglyme whereas the other alkali metal thiophenoxides exist as a solvent-separated ion pair complex in diglyme. The addition of small amounts of water converts the lithium thiophenoxide contact ion pair complex into a solvent-separated ion pair complex. A smaller secondary α-deuterium kinetic isotope effect and a larger Hammett p value are observed when the nucleophile is the contact ion pair complex in the SN2 reaction between n-butyl chloride and thiophenoxide ion in diglyme. This i

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7

K., Ranganayakulu, and Y. S. Murthy N. "Solvolytic studies in cycloalkyl systems." Journal of Indian Chemical Society Vol. 88, Feb 2011 (2011): 307–13. https://doi.org/10.5281/zenodo.5773579.

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Professor (Retd.), Department of Chemistry, National Institute of Technology, Warangal-506 004, Andhra Pradesh, India Department of Chemistry, Malia Reddy Engineering College, Secunderabad-500 014, Andhra Pradesh, India <em>E-mail</em> : nysrim@yahoo.co.in <em>Manuscript received 14 May 2009, accepted 15 September 2009</em> The angular dependence of the C-H/C-D bond for a stabilization of the developing carbonium ion in the transition state of the solvolysis reaction of cycloalkyl halides has been investigated. This has been achieved by studying the rate of solvolysis of eight cyclic β-de

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8

Smith, Peter James, та Kenneth Charles Westaway. "Secondary α hydrogen–deuterium kinetic isotope effects in the syn-elimination reaction of 2-phenylethyldimethylamine oxide". Canadian Journal of Chemistry 65, № 9 (1987): 2149–53. http://dx.doi.org/10.1139/v87-359.

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The secondary α-deuterium kinetic isotope effect has been measured for the thermal reaction of 2-phenylethyldimethylamine oxide in 90 mol% DMSO–H2O at 60.0 °C. A large secondary α-deuterium isotope effect of 1.158 per α-D was found, which indicates significant [Formula: see text] bond rupture and very little double bond formation at the transition state for this concerted syn-elimination process. The observed large normal value for (kH/kD)α is discussed in terms of the use of secondary α-D isotope effects for the determination of stereochemistry for a concerted elimination process. Various iso

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9

Westaway, Kenneth Charles, and Zhu-Gen Lai. "Isotope effects in nucleophilic substitution reactions. VI. The effect of ion pairing on the transition state structure of SN2 reactions." Canadian Journal of Chemistry 66, no. 5 (1988): 1263–71. http://dx.doi.org/10.1139/v88-205.

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Spectroscopic and conductivity studies of sodium thiophenoxide solutions in four different solvents and the secondary α-deuterium kinetic isotope effects found in the presence of 15-crown-5 ether demonstrate that the secondary α-deuterium kinetic isotope effect and transition state structure for the SN2 reaction between sodium thiophenoxide and n-butyl chloride are significantly different, depending on whether the ionic reactant is a solvent-separated ion-pair complex or a free ion. In all three solvents in which the form of the ionic reactant changes, a smaller isotope effect and tighter tran

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Wasylishen, Roderick E., and Neil Burford. "The influence of charge on nuclear magnetic resonance isotope effects." Canadian Journal of Chemistry 65, no. 12 (1987): 2707–12. http://dx.doi.org/10.1139/v87-449.

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Deuterium isotope effects on the 31P shielding constants and spin–spin coupling constants in the isoelectronic series, PH2−, PH3, PH4+, are examined. Also, deuterium isotope effects on the nuclear magnetic resonance parameters of SnH3− are examined and compared with our earlier results on SnH4 and SnH3+. The experimental results are analyzed using the models of Jameson and Osten. In each isoelectronic series it is found that the isotope effects on the heavy atom chemical shifts are largest for the negatively charged ions and essentially zero for the positively charged ions, as predicted by rec

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Dissertations / Theses on the topic "Secondary P-deuterium isotope effects"

1

Kuperman, Joshua Minoru. "Applications of NMR techniques : the anomeric effect and secondary deuterium isotope effects /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3112850.

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Chen, Min-ta, та 陳明達. "The mechanism study of the free radical SH2’reaction by secondary α-Deuterium kinetic isotope effect". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/00159285591733226251.

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碩士<br>義守大學<br>生物技術與化學工程研究所碩士班<br>94<br>The reactions of free radical addition to allylic compounds are believed to proceed the SH2'' mechanism. The secondary α-ducterium kinetic isotope effect of 3-d-allyl chloride and 3,3-d2-allyl chloride in free radical SH2'' reaction have been determined. The secondary α-ducterium kinetic isotope effects of 3,3-d2-allyl chloride and 3-d-allyl chloride were measured as 0.78 and 0.89 respectively. These inverse KIE indicate that the rate-determining-step is the radical addition to double bond in SH2'' reaction. The secondary α-ducterium of 1,1-d2-allyl c

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3

Lording, William James. "A deeper understanding of the Diels–Alder reaction." Phd thesis, 2010. http://hdl.handle.net/1885/11776.

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The Diels-Alder reaction was discovered in 1928 and has become the most efficient and practical method for the synthesis of six-membered carbocyclic and heterocyclic rings. This thesis comprises three chapters of results and discussion with the Diels-Alder reaction as a theme. Chapter 2 details an investigation of endo:exo selectivity in the Diels-Alder reactions of 1,3-butadiene. Chapter 3 explores aspects of the intramolecular Diels-Alder reactions of some substituted 1,3,8-nonatrienes, and Chapter 4 describes the domino Diels-Alder reactions of 1,4-diiodo-1,3-butadiene. The Diels-Ald

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Books on the topic "Secondary P-deuterium isotope effects"

1

Osborne, Craig. Measuring the rate constant and secondary a-deuterium kinetic isotope effect for the SN2 reaction between para-nitrobenzyl choride and cyanide ion in 15% aqueous DMSO. Laurentian University, 1996.

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2

Bruce, Cook. The Feasibility of measuring the rate constant and secondary [alpha]-deuterium kinetic isotope effect for the Sn2 reaction between sodium phenoxide and benzyl chloride at low concentrations of phenoxide ion. Laurentian University, 1995.

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Book chapters on the topic "Secondary P-deuterium isotope effects"

1

Sunko, Dionis E., and Warren J. Hehre. "Secondary Deuterium Isotope Effects on Reactions Proceeding Through Carbocations." In Progress in Physical Organic Chemistry. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470171936.ch5.

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2

Balaban, Alexandru T. "Steric Versus Electronic Components of Secondary Deuterium Isotope Effects Depend on the Size of Electrophilic Probes." In Water and Ions in Biological Systems. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0424-9_63.

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3

Matsson, Olle, and Kenneth C. Westaway. "Secondary Deuterium Kinetic Isotope Effects and Transition State Structure." In Advances in Physical Organic Chemistry. Elsevier, 1999. http://dx.doi.org/10.1016/s0065-3160(08)60194-x.

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Conference papers on the topic "Secondary P-deuterium isotope effects"

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Lee, Jin-Ha, Mamoru Nishimoto, Masayuki Okuyama, et al. "ALPHA-SECONDARY DEUTERIUM KINETIC ISOTOPE EFFECTS FOR HYDROLYSIS OF TREHALOSE BY TREHALASE." In XXIst International Carbohydrate Symposium 2002. TheScientificWorld Ltd, 2002. http://dx.doi.org/10.1100/tsw.2002.731.

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2

Lin, C. H., M. H. Lee, B. C. Hsu, and C. W. Liu. "Novel Methods to Incorporate Deuterium in the MOS Structures and Isotope Effects on Soft Breakdown and Interface States." In 2001 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2001. http://dx.doi.org/10.7567/ssdm.2001.p-1-12.

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3

Al-Za’Al, Mohammad, Harold C. Miller, and John W. Farley. "High resolution spectroscopic studies of the negative molecular ion NH− using a color-center laser." In International Laser Science Conference. Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.tul4.

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We have performed high-resolution spectroscopic measurements on the negative molecular ion NH−. The infrared beam of a Burleigh FCL-20 color-center laser overlaps a parallel mass-selected 3-keV ion beam and induces vibrational-rotational transitions. The laser-excited ionic state autodetaches, yielding a fast (keV) collinear neutral NH, which is detected by secondary electron emission. Resonances are observed by scanning the ion velocity with fixed laser frequency. Our results more than quadruple the number of high-precision measurements in this system. Our results include the important Q and

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4

Al-Za’Al, Mohammad, Harold C. Miller, and John W. Farley. "High resolution spectroscopic studies of the negative molecular ion NH− using a color-center laser." In OSA Annual Meeting. Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.tul4.

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We have performed high-resolution spectroscopic measurements on the negative molecular ion NH−. The infrared beam of a Burleigh FCL-20 color-center laser overlaps a parallel mass-selected 3-keV ion beam and induces vibrational–rotational transitions. The laser-excited ionic state autodetaches, yielding a fast (keV) collinear neutral NH, which is detected by secondary electron emission. Resonances are observed by scanning the ion velocity with fixed laser frequency. Our results more than quadruple the number of high-precision measurements in this system. Our results include the important Q and

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5

Waqas, M., J. Z. Ahmed, M. Mohamed, et al. "VTI Anisotropy Estimation of the Regional Shale from Onshore Abu Dhabi Walkaway VSP." In GOTECH. SPE, 2025. https://doi.org/10.2118/224621-ms.

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Abstract Seismic anisotropy is the directional dependence of the velocity of seismic waves propagating in a medium. It can affect how the subsurface structures are seismically imaged. Vertical Transverse Isotropy (VTI) is caused by fine geological layering such as in shales. To correct for VTI effects, we need to measure its parameters, which describe how much the seismic wave speed varies with the angle of propagation. Walkaway VSP offers the best dataset for determination of anisotropy parameters, since the direct P-wave arrivals are usually well determined, and the depths are known accurate

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