Catalytic Hydrogenation of Trivinyl Orthoacetate: Mechanisms Elucidated by Parahydrogen Induced Polarization
نویسندگان
چکیده
منابع مشابه
Parahydrogen Induced Polarization Studies Using a Continuous-Flow Homogeneous Hydrogenation Reactor
Nuclear magnetic resonance spectroscopy (NMR) is a valuable tool for obtaining structural and dynamical information of molecules. However, the method suffers from poor sensitivity compared to most other types of spectroscopy. In recent years, substantial efforts have been made to improve the sensitivity of the technique. Hyperpolarization methods such as parahydrogen induced polarization (PHIP)...
متن کاملParahydrogen-induced polarization (PHIP) in heterogeneous hydrogenation over bulk metals and metal oxides.
The results show that, in general, observation of PHIP effects on metals does not require the presence of a support. In addition, certain metal oxides can produce PHIP effects in the absence of a supported metal. The new promising catalysts for producing PHIP heterogeneously have been identified.
متن کاملTransfer of Parahydrogen-Induced Polarization to 19F:
Introduction Parahydrogen-Induced Polarization (PHIP) leads to strong signal enhancement in H-NMR if unsaturated substrates are hydrogenated with parahydrogen (p-H2) applying an appropriate catalyst. As shown before, this polarization can be transferred to heteronuclei such as C. For imaging the lung, a F-hyperpolarized contrast agent should be available, if possible for inhalation. Normally, t...
متن کاملParahydrogen Induced polarization by homogeneous catalysis: theory and applications.
The alignment of the nuclear spins in parahydrogen can be transferred to other molecules by a homogeneously catalyzed hydrogenation reaction resulting in dramatically enhanced NMR signals. In this chapter we introduce the involved theoretical concepts by two different approaches: the well known, intuitive population approach and the more complex but more complete density operator formalism. Fur...
متن کاملParahydrogen-induced polarization at zero magnetic field.
We use symmetry arguments and simple model systems to describe the conversion of the singlet state of parahydrogen into an oscillating sample magnetization at zero magnetic field. During an initial period of free evolution governed by the scalar-coupling Hamiltonian HJ, the singlet state is converted into scalar spin order involving spins throughout the molecule. A short dc pulse along the z ax...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ChemPhysChem
سال: 2021
ISSN: 1439-4235,1439-7641
DOI: 10.1002/cphc.202000957