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Second-order NMR spectra at high field of common organic functional groups

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  • The Proton Nmr Spectra Of Aryl N-Propyl Sulfides Gave Rise To What May Appear To Be First-Order Prot
  • Upon Oxidation To The Corresponding Sulfone
  • The Spectra Changed Appearance Dramatically And Were Clearly Second-Order
  • A Detailed Analysis Of These Second-Order Spectra
  • In The Sulfone Series
  • Provided Vicinal Coupling Constants Which Indicated That These Compounds Had A Moderate Preference F
  • Reflecting The Much Greater Size Of The Sulfone Over The Sulfide
  • It Also Emerged
  • From This Study
  • That The Criterion For Observing Large Second-Order Effects In The Proton Nmr Spectra Of 1
  • 2-Disubstituted Ethanes Was That The Difference In Vicinal Coupling Constants Must Be Large And The
  • N-Propyl Triphenylphosphonium Bromide And 2-Trimethylsilylethanesulfonyl Chloride
  • And Derivatives Thereof
  • Also Exhibited Second-Order Spectra
  • Again Due To The Bulky Substituents
  • Since These Spectra Are Second-Order Due To Magnetic Nonequivalence Of The Nuclei In Question
  • Not Chemical Shifts
  • The Proton Spectra Are Perpetually Second-Order And Can Never Be Rendered First-Order By Using Highe
Disciplines
  • Ecology
  • Medicine

Abstract

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