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Jyn-elimination

The thermal jyn-elimination reactions of X-oxides have assumed great importance in synthesis because of their mildness and regioselectivity. [Pg.98]

The preference for jyn-elimination leading to the fra/ii-olefins is not too difficult to understand in the alicyclic series. The use of models clearly indicates that the non-reacting alkyl residue exerts a severe limitation on the [Pg.231]

This marked preference for 1,4-jyn-elimination is not surprising as it involves two simultaneous l,2-am/-eliminations. On the other hand, l,4-ant/-elimination involves a 1,2-an -elimination coupled with a 1,2-iy -c/ma/-elimination and consequently involves less favourable overlap of the developing p orbitals in the transition state. [Pg.344]

Realising the significance and necessity of jyn"-elimination in Ej processes. Barton showed that this concept correctly predicted the direction of elimination of xanthates and esters of many natural products, based on 5- and 6-membered alicyclic rings and he subsequently used this method to predict unknown configurations of certain compounds. [Pg.267]

In step 4, the elimination of HBr is reasonable because it gives an aromatic system and because jyn-E2 elimination is a common reaction. [Pg.191]


See other pages where Jyn-elimination is mentioned: [Pg.38]    [Pg.168]    [Pg.541]    [Pg.230]    [Pg.230]    [Pg.312]    [Pg.89]    [Pg.177]    [Pg.349]    [Pg.286]    [Pg.254]   
See also in sourсe #XX -- [ Pg.130 , Pg.131 ]




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