18521-02-3Relevant articles and documents
Evidence against Reversible Wittig Reaction of a Stabilized Ylide: High (E)-Olefin Selectivity under Kinetic Control
Vedejs, E.,Fleck, T.,Hara, S.
, p. 4637 - 4639 (1987)
The betaine 10, generated by deprotonation from deuterium-labeled 8-d, decomposes stereospecifically to the (Z)-alkene.The corresponding Wittig reaction of ylide 4 with cyclohexanecarboxaldehyde, which gives a 95:5 (E)-/(Z)-alkene ratio, therefore occurs under kinetic control, without equilibration or Wittig reversal.
Highly syn-selective elimination of peterson anti-adducts to give Z-α,β-unsaturated esters
Murai, Yutaka,Nakagawa, Akira,Kojima, Satoshi
supporting information, p. 228 - 231 (2017/02/10)
Peterson adducts have been known to stereospecifically give syn-elimination products upon treatment with base except when the product olefin is in conjugation with an electron-withdrawing group. The missing piece has been put in place by using a catalytic amount of DBU, by which syn-elimination could be effected to provide the thermally less stable Z-olefin from the anti-adduct with high selectivity.
Stereoselective synthesis of either (E)- or (Z)-silyl enol ether from the same acyclic α,β-unsaturated ketone using cationic rhodium complex-catalyzed 1,4-hydrosilylation
Onodera, Gen,Hachisuka, Ryosuke,Noguchi, Tomomi,Miura, Hiroki,Hashimoto, Toru,Takeuchi, Ryo
supporting information, p. 310 - 313 (2014/01/06)
The stereoselective synthesis of either (E)- or (Z)-silyl enol ether from the same acyclic α,β-unsaturated ketone is reported. Highly (Z)-selective conditions were the use of [Rh(cod)2]BF 4/DPPE at room temperature with no solvent, whereas (E)-selective conditions were the use of [Rh(cod)2]BF4/P(1-Nap) 3 (1-Nap = 1-naphthyl) under refluxing dichloromethane.