The overall yield was 43.6%.The yield of reduce of ester was increased nearly one times than the past method because of KBH4-LiCl as the reducing agent instead of NaBH4. Changing the reaction conditions of bromization, the one-way yield enhanced 30%. The yield of reduce of the bromide was added by one times by improving the process. Tefluthrin was achieved by the catalytic esterification of DCC and DMAP.

優(yōu)化后工藝對四氟對苯二甲酯的還原采用了廉價高效的還原試劑KBH4-LiCl在线观看avvvv，使收率比NaBH4法提高了近一倍；對溴化反應(yīng)條件進(jìn)行了優(yōu)化www.好多水，單程收率提高了30%特黄AAA片视频在线播放；對溴化物還原條件的優(yōu)化，使其收率提高了近一倍超碰在线视.com；采用了催化劑DCC和DMAP合成了最終產(chǎn)品七氟菊酯色哟哟在线入口。

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Fourthly, The preparation of 1 -triazolyl-2-isoxazolinyl substituted-ethenes was developed through an one-pot 1, 3-dipolar cycloaddition of NaN_3 and RI,α-alkylation reaction of substituted allyl bromides and 1, 3-dipolar cycloaddition of nitrile oxidesbased on polystyrene-supported propargyl selenide.

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tetrabromide：四溴化物

tetrabromated 四溴化的 | tetrabromide 四溴化物 | tetrabromo 四溴

tetrabromo：四溴

tetrabromide 四溴化物 | tetrabromo 四溴 | tetrabromoethane 四溴乙烷