Influence of the quaternary ammonium salt on the addition of α-cyanocarbanions to mesityl oxide, methyl crotonate and cinnamate, and methyl sorbate under phase transfer catalysis
1,4-addition of nitrile 1a to mesityl oxide 2 giving 7a has been easily achieved under PTC liquid-liquid conditions using tetrabutylammonium hydrogen sulfate as catalyst, the quaternary ammonium salt/1a molar ratio being 0.37. In the same way, 1,4-additio
Etude de la reaction de Michael en presence de divers agents complexants des cations alcalins en milieu aprotique ou dans les conditions de transfert de phase
Michael addition of methyl cyanoacetate to benzylideneacetophenone 5a or benzylideneacetone 5b, in THF, under LiOt-Bu or KF catalysis takes place only in the presence of complexing agents for the cation.With LiO.t.Bu, HMPA, diHMPA, NIPA or 12-crown-4 show
Polysubstituted butanoic acids, esters and derivatives thereof utilizing the same as herbicides
There are provided polysubstituted butanoic acids, esters and derivatives thereof, methods for preparing the same and herbicidal compositions employing said polysubstituted butanoic acids, esters and derivatives.
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(2008/06/13)
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