Mass spectral data, irradiated

In 1963 three groups reported the synthesis of SF5NF2 29,202,203). The best preparative method is the UV irradiation of SF4 or SF6C1 with N2F4. It is a colorless gas (b.p., -17.5°C) and can be stored in steel cylinders at room temperature. It slowly decomposes on heating to SF4 and NF3. The IR, NMR, and mass spectral data 29, 202) and the gas-phase structure are reported 204). 

Oxydimurrayafoline (38), C28H24N2O3 (colourless oil) (M 436.1809) was isolated from M. euchrestifolia (55). The uv 226, 242, 253, 260, 280, 291, 324, 337 nm) and NMR data showed the presence of two NH protons (5 8.27) and two aromatic methoxy groups (8 4.01). A signal at 8 4.76 (4H, s) was attributed to two benzylic oxymethylene groups. Comparison of NMR data of oxydimurrayafoline with those of murrayafoline A and consideration of the mass spectral peak at m/z 211, about at half the value of the molecular ion peak at m/z 436, indicated the presence of a dimeric alkaloid built up from monomeric units like those of murrayafoline A. This was also substantiated by enhancement of the H-2 signal on irradiation of the aromatic methoxy signal at 8 4.01 while after irradiation of the benzylic methylene enhancement of the H-4 and H-2 signals was observed. From all these data the structure of oxydimurrayafoline was advanced as (38). 

Fig. 1. Hemispherical solar spectral irradiance incident on a 37°-tilted surface facing the equator (air mass 1.5, albedo 0.2, turbidity 0.27, ozone 3.4 mm, precipitable water 14.2 mm). Based on data in Table 1 of ASTM G159-98 2. Courtesy of the American Society for Testing and Materials.

---