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The introduction or modification of a protecting group occasionally influences the reactivity of the whole molecule. For example, diagrammed below is an excerpt of the synthesis of an analogue of Mitomycin C by Danishefsky. [110] Part of the synthesis of an analogue of Mitomycin C with modified reactivity through protecting-group exchange
The figure below shows the first total synthesis of antillatoxin by Yokokawa et al. in 1998. (2E,4E)-2,4,6,6-Tetramethyl-2,4-heptadien-1-ol was transformed using a stereoselective aldol reaction, followed by the addition of a triethylsilyl protecting group. This allowed for cleavage of the chiral auxiliary of the ester.
[60] [3] [18] This is because it possesses an allyl group at the C17α position rather than the usual ethynyl group. [ 60 ] [ 3 ] [ 18 ] As such, along with altrenogest (17α-allyl-19-nor-δ 9,11 -testosterone), allylestrenol is a derivative of 17α-allyltestosterone rather than of 17α-ethynyltestosterone .
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By Jody Godoy (Reuters) -A U.S. judge blocked the pending $25-billion merger of U.S. grocery chains Kroger and Albertsons on Tuesday, in a win for the Federal Trade Commission that Kroger has said ...
Paris Hilton, left, and Nicole Richie in Los Angeles in November. The pair star in Peacock's reality TV special "Paris & Nicole: The Encore," premiering Thursday.
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In organic chemistry, an allyl group is a substituent with the structural formula −CH 2 −HC=CH 2. It consists of a methylene bridge (−CH 2 −) attached to a vinyl group (−CH=CH 2). [1] [2] The name is derived from the scientific name for garlic, Allium sativum. In 1844, Theodor Wertheim isolated an allyl derivative from garlic oil and ...