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Sai P. Shum

Novartis

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Phosphorus Sulfur and Silicon and The Related Elements | 2013

Exocyclic Diastereotopic Protons as a Probe for Conformational Bias in Eight-Membered Rings Containing Phosphorus and Titanium

Sai P. Shum; Stephen D. Pastor; David N. Rahni

Abstract The conformation in solution of eight-membered 12H-dibenzo[d,g][1,3,2]-dioxametallocin rings containing phosphorus and titanium, respectively, were studied by the NMR spectroscopy using ring substituents containing diastereotopic protons as a probe for conformational bias. The results of this study suggest that in addition to steric effects, an electronic effect due to donation of the lone pair of electrons on the ring oxygen atoms to the metal center influences the preferred conformation in solution.

Helvetica Chimica Acta | 1993

Sterically congested phosphite ligands : synthesis, crystallographic characterization, and observation of unprecedented eight-bond 31P, 31P coupling in the 31P-NMR spectra

Stephen D. Pastor; Sai P. Shum; Ronald K. Rodebaugh; Anthony D. DeBellis; Frank H. Clarke

Journal of Organic Chemistry | 2002

The Thermal Reaction of Sterically Hindered Nitroxyl Radicals with Allylic and Benzylic Substrates: Experimental and Computational Evidence for Divergent Mechanisms

Joseph E. Babiarz; Glen T. Cunkle; Anthony D. DeBellis; David Eveland; Stephen D. Pastor; Sai P. Shum

Archive | 1993

Amorphous solid modification of 2,2',2''-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2,2'-diyl)phosphite]

Stephen D. Pastor; Sai P. Shum

Journal of the American Chemical Society | 1997

Steric Consequences on the Conformation of Medium-Sized Rings: Solution NMR, Solid-State Crystallographic, ab Initio Molecular Orbital Calculations, and Molecular Mechanics Studies on Substituted Eight-Membered Organosilicon Ring Systems1

Lilibeth P. Burke; Anthony D. DeBellis; Herman Fuhrer; Hans-Rudolf Meier; Stephen D. Pastor; Grety Rihs; Guenther Rist; Ronald K. Rodebaugh; Sai P. Shum

Inorganic Chemistry | 1996

Atomic Proximity Due to Molecular Congestion: Rational Design of Bis(phosphite) Ligands by Restriction of Molecular Motion(1).

Stephen D. Pastor; Sai P. Shum; Anthony D. DeBellis; Lilibeth P. Burke; Ronald K. Rodebaugh; Frank H. Clarke; Grety Rihs

Archive | 1995

Amorphous modification of 1,1',1"-nitrilo(tri-2-propyl-tris-[2,2'-ethylidene-bis(4,6-di-tert-butylphenyl] phosphite)

Sai P. Shum; Stephen D. Pastor

Inorganic Chemistry | 2002

Ferrocene bis(phosphonite)s: synthesis and characterization of a novel class of sterically congested ligands.

Sai P. Shum; Stephen D. Pastor; Grety Rihs

Archive | 1992

Process an alpha monoclinic crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2,2'-diyl)phosphite]

Stephen D. Pastor; Sai P. Shum; Paul A. Odorisio

Inorganic Chemistry | 2003

Sterically Congested Tripodal Phosphites: Conformational Analysis, Solid-State Polymorphism, Metal Complexation, and Application to the Asymmetric Hydrosilation of Ketones1

Sai P. Shum; Stephen D. Pastor; Anthony D. DeBellis; Paul A. Odorisio; Lilibeth P. Burke; Frank H. Clarke; Grety Rihs; Bogdan Piatek; Ronald K. Rodebaugh

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Stephen D. Pastor

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Paul A. Odorisio

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Raymond Seltzer

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Anthony D. DeBellis

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Frank H. Clarke

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Grety Rihs

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Ronald K. Rodebaugh

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Hans-Rudolf Meier

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Rita Pitteloud

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Wha Chen

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