In the meantime, we proposed a mechanism for this catalytic reaction. According to the possible formation of intermediate B, we designed a disubstituted ketene of more function to re-capture the zwitterion.

在同位素標記基礎上亚洲av无码无线在线观看，我們推測了這個N-甲基咪唑催化的二組分反應可能的機理，并根據(jù)此機理設計用一個二取代的烯酮來捕捉N-甲基咪唑和DMAD形成的兩性離子91AV综合。

A series of disubstituted monoamide s extractants were synthesized and their extracted species with uranyl nitrate were obtained by extraction method.

合成了系列雙取代單酰胺萃取劑亚洲日韩国产欧美性，利用萃取方法獲得了與硝酸鈾酰的萃合物。

The new reaction of disubstituted phosphinosilane would be available in many organic syntheses.

這類新型反應為二取代膦基硅烷類化合物的研究開辟了新方向久久热免费视频。

The key problem is to synthesize high stereoselectively trans- 2,5- disubstituted tetrahydrofurans.

高立體選擇性合成反式-2国产性爱三级免费小视频，5-二取代四氫呋喃是期待解決的關鍵問題。

Reaction conditions, either the monosubstituted product (2) or the disubstituted product 3

出特定的反應條件在线观看视频,你懂的，學生將會確定主產(chǎn)物究竟是橙色的乙醯二茂鐵(2)呢還是紅色的