苯-顺-和反-1,2-二氢二醇以显着不同的速率经历酸催化脱水:k cis / k trans = 4500。这可以通过形成不同初始构象的β-羟基碳正离子中间体来解释,其中之一是通过芳香族无键共振结构(HOC 6 H 6 + ↔ HOC 6 H 5 H +)放大的超共轭稳定。MP2 计算和苯并退火对苯离子稳定性的不利影响,由 p K R暗示对苯、1-萘和 9-菲离子分别测量的 -2.3、-8.0 和 -11.9 支持了这一解释。
The Cu(I)-catalyzed ring-opening cross-coupling of an oxabicyclic olefin with an organoboron reagent provides access to cis-2-aryl-1,2-dihydronaphthalen-1-ol derivatives, in contrast to the exclusive trans-selectivity in related Cu-catalyzed reactions with Grignard reagents. DFT calculations suggest that the reaction possibly proceeds via boronic ester by-product assisted ring-opening as an alternative