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Chemistry 121, Winter 2008, LA Tech
Drawing Curved Arrows
To show the movement of electrons in breaking and forming bonds.  The tail of the arrow is started at the site of electron density (negative character such as a pi bond or lone pair of electrons) and proceeds to the arrowhead which is drawn to the site of electron deficiency (positive character).
 
NEGATIVE TO POSITIVE!
Arrows can be drawn from:
1)  lone pair
 bond
2)  bond
 lone pair
3)  bond
 bond