Table 2.

Properties of the TRS and ground states

	Reactants*	Products*	TRS
C7-C4**	3.8 Å	3.8 Å	3.2 Å
C7-C4***	3.8 Å	3.8 Å	3.0 Å
Zn-O	1.8 Å	2.3 Å	2.25 Å
C7 hybridization	sp3	sp2	sp2.76
C4 hybridization	sp2	sp3	sp2.34

^*Reactants and products refer to those of the forward reaction.

^**H transfer.

^***D transfer.