More Electron Donors ·4 electron donor: H、 H 卜H H C-H H Butadiene:can be used as a 2 or 4 electron donor. Carbon Structure Shorthand: In order to make drawing hydrocarbon structures simpler and more compact, repetitive information is left out. .C is implied at any corner .H are added to each C as necessary to satisfy the 8 e rule. XIV-12More Electron Donors • 4 electron donor: Butadiene: can be used as a 2 or 4 electron donor. C C H C H H H C H H C C C C H H H H C C C C H H H H Carbon Structure Shorthand: In order to make drawing hydrocarbon structures simpler and more compact, repetitive information is left out. •C is implied at any corner •H are added to each C as necessary to satisfy the 8 e- rule. XIV-12