J. Org. Chem. 1990,55, 1690-1691
1690
Table 11. CrystallograDhic Data for 16a (a) Crystal Parameters formula C24Hi8N202 V , A3 1893 (1) formula wt 366.38 z 4 crystal system monoclinic D(calcd),g cm-3 1.286 p(Mo K a ) , cm-' 0.77 space group E l / C color yellow 14.802 (4) a, A 7.409 (2) size, mm 0.35 X 0.35 X 0.40 b, A 17.723 (5) T, K 293 c, 8, 103.12 (3) P, deg
diffractometer radiation wavelength, A monochromator 28 limits
R(F), 7% R(wF), %
GOF
(b) Data Collection data collected indpdt data 0.71073 R(int), % graphite obs data (5uFJ 4 I28 I48 decay, % Nicolet R3m/p Mo K a
(c) Refinement A/ u(fira1) 6.27 A(p), e 1.544 NdNv
5.63
3258
2893 3.5 1761
