Takuko
Lv 7
Takuko asked in 科學化學 · 1 decade ago

有機化學: Absolute Configuration

作業裡一題怎麼看都不會做... 看起來有像教授故意要誤導我們的...可是...還是不會... orz

圖片參考:http://members.shaw.ca/jocy.yu2/chem.jpg

請問它的 absolute configuration 是什麼..?

我是一直往 (R) / (S) 的方向想... 可是怎麼看都找不到到底要看哪裡來 assign R/S...

1 Answer

Rating
  • Yy
    Lv 7
    1 decade ago
    Favorite Answer

    If a clockwise turn of the screw would move it away from the viewer it is considered to have a plus or P configuration, also termed Ra or Rh by some. 以這螺旋中空處為軸心 如果以順時針方向轉 會使其遠離觀察者是plus 或P 也有稱為Ra or Rh

    In contrast, if a counterclockwise turn moves the helix away it has a minus or M configuration, sometimes called Sa or Sh

    如果以反時針方向轉 會使其遠離觀察者是minus or M 也有稱為Sa or Sh

    圖片參考:http://www.cem.msu.edu/~reusch/VirtualText/Images4...

    所以以上問題的化合物是M 或 S

    http://www.cem.msu.edu/~reusch/VirtualText/symmetr...

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