Results 151 to 160 of about 1,064,069 (358)

Iridium‐Catalyzed Enantioselective Intramolecular Hydroarylation of Allenes: Formal Synthesis of (+)‐Rhazinilam

open access: yesAngewandte Chemie, EarlyView.
A highly enantioselective iridium‐catalyzed hydroarylation of allene‐tethered pyrroles and indoles that provides access to relevant heterocyclic systems bearing vinyl‐substituted 3ry or 4ry stereocenters is reported. Its synthetic potential was exemplified with a very short, highly enantioselective formal synthesis of (+)‐Rhazinilam, whereas DFT ...
Andrés Arribas   +4 more
wiley   +2 more sources

<b>Análise físico-química e legalidade em bebidas de laranja<br>Physical-chemical analysis and legality in orange beverages</b>

open access: yesAlimentos e Nutrição, 2010
<p align="justify">O objetivo do presente trabalho foi mensurar o °Brix, acidez titulável (AT) e ratio em sucos concentrados, sucos, néctares e refrigerantes de laranja comerciais e compará-los com os seus Padrões de Identidade e Qualidade (PIQ) publicados pelo Ministério da Agricultura, Pecuária e Abastecimento (MAPA) e Codex Alimentarius.
R. FIGUEIRA   +5 more
openaire   +1 more source

An Atomically Dispersed Photocatalyst for Undirected para‐Selective C─H Bond Functionalizations

open access: yesAngewandte Chemie, EarlyView.
This study presents an atomically dispersed recyclable heterogeneous photocatalytic method for para‐selective trifluoromethylation of electron‐deficient arenes without directing groups. Unlike previous substrate‐dependent approaches, this recyclable, atomically dispersed photocatalyst enables scalable synthesis of bioactive trifluoromethylated ...
Suman Pradhan   +16 more
wiley   +2 more sources

<b>Influência do branqueamento nas características físico químicas e sensoriais do abacaxi desidratado<br>Infl uence of blanching on physicochemical and sensorial characteristics of dehydrated pineapple</b>

open access: yesAlimentos e Nutrição, 2011
<p align="justify"> No Amazonas, o abacaxi vem se destacando entre os Arranjos Produtivos Locais, porém, a produção crescente e a incapacidade do mercado em absorvê-lo assim como a alta perecibilidade do abacaxi in natura contribuem para o baixo preço do fruto no período de safra.
S. S. GONÇALVES   +2 more
openaire   +1 more source

Stepwise Acetylene Insertion and Ammonia Activation at a Digallene and Diindene

open access: yesAngewandte Chemie, EarlyView.
The stepwise insertion of acetylene into the E═E bonds of digallenes and diindenes is reported. This leads to the selective formation of four‐ and six‐membered rings with 2π E2C2 and 4π E2C4 cores. The six‐membered cyclohexadiene analogues are Lewis‐acidic and can form stable, isolable adducts with ammonia, which—upon heating—undergo ammonolysis ...
Álvaro García‐Romero   +2 more
wiley   +2 more sources

Determinação do nível de lisina na fase inicial-II do crescimento de suínos, através da composição química e deposição de tecidos e efeitos na terminação

open access: yesBoletim de Indústria Animal, 2013
Trinta suínos híbridos comerciais, machos castrados e fêmeas foram amostrados de um experimento de desempenho e abatidos para determinar a composição química das frações corporais e taxas de deposição protéica e lipídica na carcaça e corpo vazio.
Messias Alves da Trindade Neto   +4 more
openaire   +5 more sources

Reduction‐Induced C─C Cleavage and Site‐Specific Hydrogenation of a Highly Strained Bilayer Spironanographene

open access: yesAngewandte Chemie, EarlyView.
Single‐crystal X‐ray diffraction analysis revealed a reduction‐induced ring cleavage with subsequent hydrogenation of a bilayer spironanographene upon treatment with alkali metals. Density Functional Theory (DFT) calculations suggested localized spin density on the C‐atom at the central spirocycle upon one‐fold reduction, facilitating a site‐specific ...
Juan Lión‐Villar   +7 more
wiley   +2 more sources

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