Thiopyrans spectra

A detailed assignment of the H NMR spectrum (THF-r/g) of 3,6-dihydro-277-thiopyran and its lithio anion 83 have been reported <1995BCJ2739>. While the signals for the 3- and 4-methylene units overlap with those of the cyclohexyl groups of 6-(tricyclohexylstannyl)-3,4-dihydro-277-thiopyran 84, the signals for H-2 and H-5 are resolved and the latter shows 3 bond coupling (as) to Sn of 47.5 Hz <1997T12273>. 

The 19F NMR spectrum of the cycloadduct from the reaction between 2//-thiopyran-2-thionc, derived from tetrathiofulvalene by loss of CS2, and the fluorinated fullerene C60F18 shows only 16 fluorine atoms indicating that the [2+2]-cycloaddition involved the loss of two F atoms. The most upfield signal is associated with the F atoms adjacent to the donor sulfur addend <2003GEJ2008>. 

---