Buscar
Mostrando ítems 31-40 de 2338
Asymmetric Organocatalytic C-C Bond Forming Reactions with Organoboron Compounds: A Mechanistic Survey
(Wiley VCH Verlag, 2019-05-26)
The recent development of asymmetric organocatalytic C-C bond forming reactions involving organoboranes has attracted big interest in the synthetic community. Asymmetric organocatalytic additions to enones, aldehydes, ...
Synthesis and characterization of melanin in DMSO
(2013-09-05)
Recently soluble melanin derivatives have been obtained by a synthetic procedure carried out in DMSO (D-melanin). In this work a comparative study of the structural characteristics of synthetic melanin derivatives obtained ...
Oxygen heterocycles: Pyrylium salts
(World Scientific, 2019)
Single electron redox pathways play a pivotal role in a vast array of processes central to life on the planet. It is no surprise that organic chemists have been intrigued by the possibility that single-electron redox ...
Redução e acetilação de nitroaromáticos como proposta de reações na água vermelha (Red water)
(Universidade Tecnológica Federal do ParanáPato BrancoBrasilDepartamento Acadêmico de QuímicaQuímicaUTFPR, 2016-06-14)
Nitroaromatic can be reduced to yield aromatic amines through the use of acid and zerovalent metal. These amines are used as starting point for the synthesis of intermediates of various substances such pharmaceuticals and ...
Recent Advances in Using Niobium Compounds as Catalysts in Organic Chemistry
(Bentham Science Publ Ltd, 2015-01-01)
Niobium is not found in nature in its free form, but usually in the form of oxides and usually with the tantalum element. The largest niobium reserves are in Brazil. The use of niobium compounds in organic synthesis has ...
Studies toward the synthesis of Amaryllidaceae alkaloids from Morita-Baylis-Hillman adducts. A straightforward synthesis of functionalized dihydroisoquinolin-5(6H)-one core
(Soc Brasileira QuimicaSao PauloBrasil, 2007)
Preparation of 9.5/65/35 PLZT powders by organic precursor method
(2001-01-01)
In this study the preparation of 9.5/65/35 PLZT ceramic powders were investigated. The powders with the formula Pb0.905La0.095(Zr0.65 Ti0.35)0.976O3 + 3.5 w% PbO were prepared using Pechini process and partial oxalate ...
Preparation of 9.5/65/35 PLZT powders by organic precursor method
(2001-01-01)
In this study the preparation of 9.5/65/35 PLZT ceramic powders were investigated. The powders with the formula Pb0.905La0.095(Zr0.65 Ti0.35)0.976O3 + 3.5 w% PbO were prepared using Pechini process and partial oxalate ...
DNA Nucleobase Synthesis at Titan Atmosphere Analog by Soft X-rays
(Amer Chemical SocWashingtonEUA, 2009)