4 research outputs found
Trimethyl-3-methÂoxy-4-oxo-5-triphenylÂphosphoÂranylÂideneÂcycloÂpent-1-ene-1,2,3-tricarboxylÂate
The title compound, C30H27O8P (2), was formed as one of two products {(1) [Krawczyk et al. (2010 â–¶). Acta Cryst. E66 (cv2752)] and (2)} in the reaction of dimethyl acetylÂenedicarboxylÂate with triphenylÂphosphine. The molÂecule of (2) consists of a five-membered carbocyclic ring. The P atom is a part of a triphenylphosphoranylidene substituent. In contrast to (1), the five-membered ring of (2) is planar, the r.m.s. deviation being only 0.009 (2) Å
TetraÂmethyl 1,1,2-triphenyl-2H-1λ5-phosphole-2,3,4,5-tetraÂcarboxylÂate
The title compound, C30H27O8P (1), was formed as one of two products {(1) and (2) [Krawczyk et al. (2010 â–¶). Acta Cryst. E66 (cv2753)]} in the reaction of dimethyl acetylÂenedicarboxylÂate with triphenylÂphosphine. The molÂecule of (1) consists of a five-membered ring, in which the P atom is incorporated. One of the phenyl groups of the triphenylÂphosphine migrated to a vicinal C atom during the reaction. The five-membered ring of (1) is corrugated [r.m.s. deviation = 0.0719 (8) Å], whereas that in compound (2) is planar, the r.m.s. deviation being only 0.009 (2) Å