نتایج جستجو برای: hydroxy
تعداد نتایج: 31232 فیلتر نتایج به سال:
چکیده کاتالیست های ناهمگن (1) (silica gel)-o2(eto)si-l1-mn(hl2) ، (silica gel)-[o2(meo) ni-h2l3(h2o)] (3)، (silica gel)-[o2(meo) cu-l4(h2o)2] (4) باکارایی و گزینش پذیری بالا به ترتیب از طریق تثبیت کمپلکس های منگنز، مس و نیکل روی بستر های معدنی سنتز شدند. کاتالیست دستوار(2) sio2-[mn3(µ-d-(?)-tart)2(ohch3)6(ch3co2)] از طریق حلال کافت سل-ژل و تراکم چندتایی باز شیف در حضور d- (-) تارتاریک اسید در...
Catalysis of the acylation aniline with 3-hydroxy-2-naphthoic, 1-hydroxy-2-naphthoic, 2-hydroxy-1-naphthoic and 1-hydroxy-4-naphthoic acids by phosphorus P(III) silicon Si(IV) compounds leads to formation anilides corresponding hydroxynaphthoic under mild conditions (ortho-xylene, 146.5–147 °C) in almost quantitative yield.
 Among trichloride tribromide; phosphorous, 1-hydroxyethyliden...
Poly(α-hydroxy acids), as a family of biodegradable polyesters, are valuable materials due to their broad applications in packaging, agriculture, and biomedical engineering. Herein we highlight explore recent advances catalysts controlled ring-opening polymerization O-carboxyanhydrides towards functionalized poly(α-hydroxy especially metal catalyst-mediated polymerization. Limitations current s...
abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...
Background and Aim: Anti-inflammatory and hypo- pigmenting effects of topical tretinoin and alpha-hydroxy acids have been documented. This study was designed to compare the efficacy of 0.05% tretinion cream with 7% alpha-hydroxy acid in the treatment of ephelides. Methods: In this clinical trial 80 patients with ephelides were selected and allocated into two groups. One group was treated with ...
a number of 6-hydroxy-2-benzylidene-3-coumaranones were synthesized from condensation of 6-hydroxy-3-coumaranone with appropriate aldehydes and were evaluated for their antioxidant activities. the antioxidant activity was assessed using two methods, including, 1,1-biphenyl-2-picrylhydrazyl (dpph) radical scavenging, and reducing power assays. some of the benzylidene coumaranones showed antioxid...
the main goal of this work was to synthesize and evaluate the effect of dehydration temperature on the potential application of hydroxy sodalite zeolite membrane. hydroxy sodalite zeolite membranes were synthesized via direct hydrothermal method onto a tubular alumina support without seeding in a hot air oven. the synthesized membranes were characterized by x-ray diffraction (xrd) and scanning ...
metalloporphirins; cu(tpp), mn(tpp)cl, co(tpp), fe(tpp)cl, zn(tpp) and mn(obp)cl catalyze region and chemoselective silylation of hydroxyl groups with hmds. fe(tpp)cl is the most effective catalyst and silylation occurs immediately in its presence at room temperature.
This search involved synthesis of several new N-Substituted -3-chloro-
 2-azetidinones which were known as a high medicinal effectiveness for 2,
 4-Diamino-6-hydroxy pyrimidin in two steps. The first step included
 preparation Shiff bases (1-6) by condensation 2, 4-Diamino-6-hydroxy
 with many substituted aldehydes(4-hydroxy benzaldehyde, 2-
 bromobenzaldehyde, 4-dimeth...
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