a concept in organic chemistry where a reaction occurs between components with opposite electron demands (i.e., a 4π component with a high electron density reacts with a 2π component with a low electron density)
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3-Methoxy-1-(2',3',5'-tri-O-benzyl-α-D-ribofuranosyl)-propin
3-(2-PYRIDYL)-5,6-DIPHENYL-1,2,4-TRIAZINE
(3S*,4aR*)-3-(benzyloxy)-1-methyl-2-(phenylsulfonyl)-2,3,4,4a,5,6,7,8-octahydroisoquinoline
