نتایج جستجو برای: poly phenols

تعداد نتایج: 91449  

Journal: :Angewandte Chemie 2017
Patrick S Fier Kevin M Maloney

The conversion of aryl halides to phenols under mild reaction conditions is a longstanding and formidable challenge in organic chemistry. Herein, we report the rational design of a broadly applicable Pd-catalyzed method to prepare phenols with benzaldehyde oxime as a hydroxide surrogate. These reactions occur under mildly basic conditions and enable the late-stage hydroxylation of several funct...

Journal: :Chemical communications 2011
Hidetoshi Ohta Hirokazu Kobayashi Kenji Hara Atsushi Fukuoka

Carbon-supported Pt catalysts are highly active and reusable for the aqueous-phase hydrodeoxygenation of phenols as lignin models without adding any acids. It is suggested that Pt/carbon facilitates the hydrogenation of phenols and the hydrogenolysis of the resulting cyclohexanols.

Journal: :Journal of the American Chemical Society 2003
Robert E Maleczka Feng Shi Daniel Holmes Milton R Smith

An efficient one-pot C-H activation/borylation/oxidation protocol for the preparation of phenols is described. This method is particularly attractive for the generation of meta-substituted phenols bearing ortho-/para-directing groups, as such substrates are difficult to access by other phenol syntheses.

2008
S. Lee

Chikusaku-eki and Mokusaku-eki are natural resources and acidic liquid by-products of bamboo and broad leaved trees charcoal burner. These products contain more than 200 ingredients, including phenols, poly phenols and acetic acids. These by-products were tested for their fungicidal activity against sapstaining fungi. There are no studies about the antifungal activity of Chikusaku-eki and Mokus...

2014
Young Eun Lee Trung Cao Carilyn Torruellas Marisa C. Kozlowski

Simple catalysts that use atom-economical oxygen as the terminal oxidant to accomplish selective ortho-ortho, ortho-para, or para-para homo-couplings of phenols are described. In addition, chromium salen catalysts have been discovered as uniquely effective in the cross-coupling of different phenols with high chemo- and regioselectivity.

2013
H. Möhrle D. Schake Gunther Seitz

Mannich bases were prepared from substituted phenols with aliphatic amines and formal­ dehyde. Amine exchange with N-methyl-2-naphthylamine followed by a Hofmann Martius rearrangement gave rise to o,o'-amino-hydroxy-diphenylmethane derivatives. Under cyclization conditions some of these compounds produced spirocyclohexadienones, which are the ipso analogs to the hypothetic intermediates postula...

Journal: :Environmental Health Perspectives 1979
I A Veldre H J Jänes

Estonian shale oil contains about 25--30% phenols, and their action determines the toxicity of shale oils. The clinical symptoms of intoxication are rather similar, regardless of route of administration. Due to neurotropic action, the coordination of movements is impaired, and clonic and tetanic convulsions, paresis and paralysis of extremities, and narcosis are observed. In subacute and chroni...

Grapes are significant sources of nutritional antioxidants as well as biologically active dietary components. This study was carried out to determine the amount of total phenols, anthocyanins and antioxidant activity of 35 grapevine (Vitis vinifera L.) cultivars grown in Fars province (Iran). Ripened bunches were randomly harvested from grapevine collection in Zarghan (Fars province, Iran) Agri...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده علوم 1391

چکیده فارسی: مقایسه اثرات پماد سیلور سولفادیازین و تزریق زیر جلدی سلولهای مزانشیمی تحریک شده با آگونیست (lps)tlr4 و آگونیست tlr3 (poly i-c) در ترمیم سوختگی در موش اخیرا" سلولهای مزانشیمی به عنوان منبع مهمی از سلولهای تمایز نیافته که می توانند به سلولهای رده مزودرمال تبدیل شوند شناسایی شده اند. در این مطالعه اثرات سلولهای مزانشیمی تحریک شده با لیپو پلی ساکارید (lps) و پلی اینوسینیک پلی سیتیدی...

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