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348741419

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benmao_mogu

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2Â¥2012-03-30 13:07:06
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yifeng1206

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°®ÓëÓêÏÂ: ½ð±Ò+2 2012-03-30 21:12:45
348741419: ½ð±Ò+100, ·­ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú, ËäÈ»²»ÊǺÜ׼ȷ£¬ÒÀÈ»ºÜÊÜÓ᣷dz£¸Ðл¡£ 2012-03-31 08:45:55
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Hydroxyhydroquinone is prepared according to THIELE(4). We got it without color and more stable by treatment in black with its solution in ether isopropylique and distillation of the ether in vacuum. The results from condensation is found improved.
We put a slow stream of dry gas of HCl into a mixture of 12.6g hydroxyhydroquinone, 8.2cm3 of ethyl cyanoacetate, 5g ZnCl2 recently melted, and 50cm3ÎÞË®ÒÒÃÑ. ¸÷ÖÖÎïÆ··Å½øÈ¥Ê±ÊÇÈÜҺ״̬£¬È»ºóËüÖð½¥·Ö³ÉŨÃܺÍרɫµÄoil. ·ÅÖÃÁ½Ììºó£¬the oil is separated and re-taken by water¡£µÃµ½µÄÀ¶É«ÈÜÒºÁ¢ÂíÊͷųöcetimine when we spin and dry it quickly. ÔÚ50% aqueous pyridineÖнᾧµÃµ½µÄcetimineµÄ²úÂʲ»³¬¹ý½ö½ö9%. ÎÒÃÇÔÚ 130-140¡ã ¼ÓÈÈa suspension of 1.9g of this cetimine in 19cm3 of 90% SO4H2. ÎïÆ·¼ÓÈëʱÊÇÈÜÒº, then hydroxyesculetolÂýÂýµÄ½á¾§¡£¼ÓÈÈÁ½Ð¡Ê±ºó£¬ we spin, wash and purify by dissolution in 90cm3 of hot propanol, in black condition. The hot solution, without color, is added by 25cm3 water and cooled¡£½á¾§µÄ²úÆ·±»Ðý¸É¡£²úÂÊ£º65%¡£ÈÛµã325-326¡ã(block£¬·Ö½â£¿)¡£
The hydroxy-4 esculetol ÔÚË®ºÍ¾Æ¾«ÖÐ΢ÈÜ£¬¿ÉÈÜÓÚpyridine¡£
3Â¥2012-03-30 20:49:45
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