... Journal of the ... 1 J P–P interactions, that is, 250 < J < 400 Hz,(14-16) and three longer range (2 × 2 J and 1 × 3 J) P–P interactions. ... In addition, we note that compounds 4a/b are isolobal inorganic models for the protonated intermediates invoked in acid-catalyzed ring-opening of ...