... 0002-7863/90/ 15 12-7748$02.50/0 0 1990 American Chemical Society ... For I9F NMR at 376.29 MHz, we arbitrarily take chemical shifts relative to an assumed value of 6 -76.00 for a mixture of 0.8 ... 22) Kaplan, J. 1.: Fraenkel, G. NMR of Chemically ExchangingSysrems; Academic ...