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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Googlelovqj</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Sat 3:47, 26 Feb 2011<span class="gen"> </span> Post subject: air jordans Phase transfer catalysts in organic sy</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Phase transfer catalysts in organic synthesis and its application of photographic <br /> <br /> <br />Organic Synthesis Phase Transfer Catalysis technology to today, and intermediates in organic synthesis photography has also been some applications. Ai-Xi Hu et al [: study of the phase transfer catalysis alkylation in N application and noted that: aromatic amines, amides, and ammonia nitrogen heterocyclic compounds have very weak on the acidic hydrogen, nitrogen in the usual alkylation the need to use alkali as acid binding agent, the reaction carried out in the proton solvent, the product is difficult to separate. After the application of phase transfer catalysis technique can be obtained in high yields under mild conditions and easy separation of N-alkylation products in the synthesis of couplers, the following response to reports abroad ll: occc () (wxCcoo organic intermediate synthesis of two camera in. pTC to the application of certain effective. 0 @ l-r_c0CHCH2NHCHzCOOCzHs 『cH 【n) Li Bina Antifoggants】 one in a 5-phenyl tetrazole thiol synthesis, application of three-phase catalysis from aniline, carbon disulfide, ammonia water after the synthesis of phenyl isothiocyanate and sodium ammonia stack response to tributyltin benzylamine resin as catalyst, successfully resolved the traditionally (PhNl-I) 2CS, NaCNO, 4 - alkyl (or aryl yl)-3-thiosemicarbazide and two disulfide tetrazole, 5 aniline l, 2,4 - thiadiazole triazole as the source of raw materials caused by the difficulties of raw materials and low yield problems. And found that when the catalyst is the highest yield 0.025mol. 2 cross-linking the purpose of size i00 4 crosslinked resin particle size than the 200 the purpose of effect. 『『 ≮ + N3, 7,7 1994, photosensitive material No. 6 Yao Rongguo in Caine film former TGIC (three glycidyl isocyanurate) synthesis was found, due to cyanuric acid in the small solubility of epichlorohydrin,<a href="http://www.airjordansshoescheapnike.com" target="_blank">air jordans</a>, there is solid-liquid two-phase reaction system, the reaction is difficult to add a small amount of quaternary ammonium salt catalyst, the reaction quickly, cyanuric acid in a short time away. Xia Jun, Xiao Renliang the phase transfer catalysis diazotization,<a href="http://www.stivaliuggsitalia.net" target="_blank">ugg italia</a>, coupling reaction,<a href="http://www.airjordansshoescheapnike.com" target="_blank">air jordan shoes</a>, a number expected to promote the use of photographic dyes synthesis. The following two papers the synthesis of fluorescent whitening agent, also used phase transfer catalysis: the high rate of consumption of low-income,<a href="http://www.spacciomoncleroutlets.com" target="_blank">moncler italia</a>, and in many industrial production has been applied, but the domestic photographic coverage of organic production is still small I believe that mastery of the technology and application of photosensitive materials will be able to promote the domestic development of the cause. References 1StorksCM. Uof NIE C. Phasetransit aim Association 『A ~ demJc mouth | e shrews: NewYork, 19782 Association for Organic Synthesis Chemistry, 1990,48:511 ~ 2】 3Storks. Phasettansf ~ ~ falyshnewch ~ Jsttycam] vslsandapplication. AnSymo ~ ioumS ~ fi ~. 1987.3284 Li Ji-Tai. Baoding Chemical, 1983, (1): 265 Ma Yingzhe, such as Henan, chemical, 1989, (2): 36 ~ 37 (on the next 26 million) 3. Results and discussion amination prepared compounds (_), as isopropylamine low boiling point, volatile loss, reaction with ethanol as solvent, to get the product. However, long reaction time, low yield; product (Ⅲ) can be dissolved in acetic acid solution,<a href="http://www.spacciomoncleroutlets.com" target="_blank">giubbotti moncler</a>, and insoluble reactants. The infrared spectra (IR) in the 2500 ~ 3000cm one peaks, is Chung ammonium ion (a NH) characteristics. Compounds (Ⅲ) the introduction of trifluoroacetyl protective group, with trifluoroacetic anhydride in ether medium for the introduction of the carbonyl (c-o) IR absorption peak l685.4cm ~, a NH peak disappeared. Compounds (Ⅳ) with o-fourth alkoxy aniline condensation with N, N a dicyclohexyl carbodiimide ((BU --<)) as dehydrating agent. Reaction in DMF solvent, infrared spectra showed a high yield of a large number of C-H peak (2923.4cm), the introduction of carbonyl protecting groups still exist (1689.9cm), but slightly short of the station moving object (V) is hydrophobic, the design of pyridine in a methanol and a homogeneous solution of sodium hydroxide hydrolysis can be carried out smoothly, with hydrochloric acid salt purification, protection of infrared spectrum shows carbonyl disappeared. Hydrolysis product (VI) and S, S a carbonyldiimidazole-1 a-phenyl-a 5 a thiol tetrazolium reaction of DIAR Green coupler (I), its molecular structure in addition to displaying the introduction of the carbonyl group (c-o) peak (1702cm_1 ), but also confirmed by elemental analysis. References 1Lau. Pb. ilJpTS. US. 4.248.9622 rope small-minded Zhang, Jin-Zong Yang. Photosensitive materials, 1990. (3): 21 ~ 253 hi Taki Christine. And so on. Chartered Gazette. 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