... Tetrahedron. Volume 69, Issue 10, 11 March 2013, Pages 2319–2326. ... Optical rotations were measured with a JASCO P-1020 instrument and [α] D values were in units of 10 −1 deg cm 2 g −1 at 25 °C. Mass spectra were recorded on Finnigan Mat 1210 double focusing mass ...