The crystal structure of 3′‐methoxy‐5‐phenyl‐5,10‐dihydrophenarsazine, C₁₉H₁₆AsNO

Abstract

The crystal structure of 3′‐methoxy‐5‐phenyl‐5,10‐dihydrophenarsazine, C19H16AsNO has been determined by the single crystal x‐ray diffraction method. The crystals are monoclinic with a = 15.305(6), b = 5.809(2), c = 17.595(6)Å, β = 92.92(2)°, V = 1562.3(1.0Å3, space group P2,/n, Z = 4 and dcalc = 1.485g cm−3. An automatic diffractometer with graphite monochromatized MoKα radiation was used to obtain 1480 observed reflection with I > 3σ(I) at 2θ < 50°. Final R = 0.040 and wR = 0.032. The tricyclic ring is folded with the central ring in a flattened boat conformation. The folding angle between the least‐squares planes of the two benzo rings is 164.6(2)°. The 3′‐methoxyphenyl group is in a boat‐axial conformation with respect to the central ring.

Synthesis, molecular and crystal structure, and properties of 10-propylthio-5,10-dihydrophenarsazine

“…Evidence for the existence of several crystalline forms of 1 and the possibility of geometrical isomerism of 1 has also been provided by an X-ray investigation [6]. X-ray investigations of other 5,10-dihydrophenarsazine derivatives, such as 10-bromo- [8], 10-(m-tolyl)- [9], 5-(3-methoxyphenyl)- [10], 5-methyl- [11], and 5,10-diphenyl-5,10-dihydrophenarsazines [12], were also carried out.…”

Structure of 10-(m-tolyl)-5,10-dihydrophenarsazine

“…As part of our continuing structural studies of substituted phenarsazines and phenothiazines, we have recently determined the structure of 10-(3-methoxyphenyl)-5,10-dihydrophenarsazine (de Meester, Chu, Jovanovic & Biehl, 1985). We report here the structure of 10-(m-tolyl)-5,10-dihydrophenarsazine.…”