Results 11 to 20 of about 537 (178)
Deprotonative C(sp<sup>3</sup>)/C(sp<sup>2</sup>)-H (Multi)Silylation of (Hetero)Arenes Mediated by NaTMP. [PDF]
Angew Chem Int Ed EnglAn operationally simple protocol using a strongly basic sodium amide in combination with sterically emcumbered silicon electrophiles enables the deprotonative C–H (multi)silylation of a myriad of (hetero)arenes. Mechanistic investigations highlight the pivotal role of steric and coordination effects in controlling the regioselectivity and efficiency of
Sánchez-Roa D +6 more
europepmc +2 more sources
The nuclear magnetic resonance spectra of four spin systems. III. Proton resonance spectra of α, β and γ picolines [PDF]
, 1961 The ring proton resonance spectra of α, β and γ picolines have been studied at 40 Mc./sec. The spectra which belong to the classes ABCX, ABXY and A2X2 respectively have been completely analyzed to determine all the involved ...
Nageswara Rao, B. D. +1 more
core +1 more source
Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.This review highlights recent advances in integrating biocatalysis and chemocatalysis in continuous flow to create streamlined, sustainable processes. It examines chemo‐enzymatic cascades combining at least one enzymatic and one chemical step, discusses challenges such as enzyme immobilization, leaching, and reactor clogging, and presents solutions ...
Petros Siasiaridis +2 more
wiley +2 more sources
Physico-Chemical Study of the Reaction between Picolines and Chromithiocyanate
, 1967 Pyridine and methly substituted Pyridines (α-, \(\beta\)- and \(\gamma\)-picolines) react with potassium chromithiocyanate in presence of acetic acid to yield stable light pink to dark violet-pink coloured compounds.The composition of these compounds ...
M. P. Gupta, M. L. Anand
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Molecular interactions of some picolines with benzene and carbon tetrachloride
, 2017 Excess volumes, VE, of binary mixtures of α-picoline, β-picoline, and γ-picoline with benzene and carbon tetrachloride, and dipole moments, μ2, of picolines in these mixtures have been measured as a function of a composition at 20° to 50°C.
Hakim G. Shinouda +3 more
core +1 more source
Coordination‐Driven Direct C─H Metalation of N‐Heterocycles With a Superbasic Co(II) Amide Co(TMP)2
Angewandte Chemie International Edition, EarlyView.By enabling regioselectivities that are inaccessible with conventional bases, this study introduces a Co(II) amide platform for the deprotonative C─H metalation of sensitive N‐heterocycles. Subsequent interception of the resulting Co(II) intermediates with external oxidants affords a family of sterically congested, TMP‐substituted heterocycles via C─N ...
Na Jin +3 more
wiley +1 more source
Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview
Chemistry – A European Journal, EarlyView.The graphical abstract summarizes the review “Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview”, highlighting representative Pd(II)‐catalyzed methods for the β‐arylation of α‐amino acids. Key mechanistic features, substrate diversity, and synthetic relevance of these transformations are showcased. Abstract Metal‐catalyzed C─
Davide Illuminati +4 more
wiley +1 more source
The characterization of modified silica-alumina catalysts active in the synthesis of picolines
, 1995 The SiO2-Al2O3 catalyst is modified by promoters like Pb, Cr, Cu. The SiO2-Al2O3 catalyst is also modified using two elements by a simultaneous or stepwise impregnation method. The catalysts are characterized by XRD, IR and ESR techniques, and are useful
Subrahmanyam, M. +3 more
core +1 more source