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The main limitation of the traditional Wittig reaction is that the reaction proceeds mainly via the erythro betaine intermediate, which leads to the Z-alkene. The erythro betaine can be converted to the threo betaine using phenyllithium at low temperature. [18] This modification affords the E-alkene. The Schlosser variant of the Wittig reaction
For stabilized Wittig reagents bearing conjugated electron-withdrawing groups, even relatively weak bases like aqueous sodium hydroxide or potassium carbonate can be employed. [Ph 3 PCH 3] + Br −, typical phosphonium salt. The identification of a suitable base is often an important step when optimizing a Wittig reaction.
The Wolff–Kishner reduction is a reaction used in organic chemistry to convert carbonyl functionalities into methylene groups. [1] [2] In the context of complex molecule synthesis, it is most frequently employed to remove a carbonyl group after it has served its synthetic purpose of activating an intermediate in a preceding step.
Dena Schlosser (née Leitner, born 1969) is an American woman who lived in Plano, Texas, who, on November 22, 2004, used a knife to amputate the arms of her ten-month-old daughter, Margaret, who died as a result.
Wittig faced a maximum of 455 years behind bars and intended to appeal. On January 5, 2007, the 10th U.S. Circuit Court of Appeals overturned the convictions of Wittig and Lake in the Westar Energy case. Wittig was freed from prison on February 12, 2007. Wittig was scheduled to be retried for the third time for looting Westar in September 2008.