TY - JOUR
T1 - Oxidation of 1,2-diphenyl-3,4-diphosphinidenecyclobutene on the group-6 metal tetracarbonyl complexes
AU - Yoshifuji, Masaaki
AU - Ichikawa, Yoshito
AU - Toyota, Kozo
N1 - Funding Information:
plane. The P(1)--W(1) bond length is 2.454(4)/~. The six ligands around the W atom are located as a slightly deformed octahedron. The P=C bond length \[1.693(9)/~ for P(1)-C(1)\] is close to the corresponding values reported for the molybdenum complex 411 (1.680(4) and 1.686(4) ,/~).6b The bond length for C(1)-C(I*) is 1.45(1)/~ and the value is shorter than that for either 2 (l.498(8) ,~) or 4B (1.483(6) ,/~),6b but is similar to that for 2,3-dichloro-l,4-bis(2,4,6-tri-t-butylphenyl)-1,4-diphospha-1,3-butadiene (8, 1.445(7)/~).l 1 A very similar structure was obtained for 7A by X-ray crystallographic analysis. 12 This type of oxidation appears to occur from an excited state of the metal(0) complexes 6 upon irradiation with light to react with ground-state oxygen since the free ligand 1 itself did not react with oxygen. 13 Thus, a control reaction of (E,E)-I (40 mg) in benzene (100 mL) under similar conditions, even in the presence of 5,10,15,20-tetraphenyl-21H,23H-porphine (10 mg) as a triplet sensitizer, 14 resulted in the recovery of the starting 1 together with a small amount of isomerized (E,Z)-I due to the E/Z photo-isomerization. 5a The complexes 7 are considered as a 2,3-substituted 1,4-diphospha-l,3-butadiene and expected to be converted into further extended derivatives of interest. The authors thank Dr. Shigeru Sasaki at Tohoku University for X-ray analysis of 7C. This work was supported in part by Grants-in-Aid for Scientific Research (Nos. 06303002 and 08454193) from the Ministry of Education, Science, Sports and Culture of the Japanese Government and Scientific Research Funds from the Takeda Science Foundation.
PY - 1997/3/3
Y1 - 1997/3/3
N2 - The group-6 metal(0) tetracarbonyl complexes of a sterically protected 3,4-diphosphinidenecyclobutene were irradiated with light in the presence of oxygen to give tetracarbonyl[2,3-dibenzoyl-1,4-diphospha-1,3-butadiene]metal(0) complexes, and the structures were confirmed by X-ray analysis.
AB - The group-6 metal(0) tetracarbonyl complexes of a sterically protected 3,4-diphosphinidenecyclobutene were irradiated with light in the presence of oxygen to give tetracarbonyl[2,3-dibenzoyl-1,4-diphospha-1,3-butadiene]metal(0) complexes, and the structures were confirmed by X-ray analysis.
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U2 - 10.1016/S0040-4039(97)00118-4
DO - 10.1016/S0040-4039(97)00118-4
M3 - Article
AN - SCOPUS:0031550890
SN - 0040-4039
VL - 38
SP - 1585
EP - 1588
JO - Tetrahedron Letters
JF - Tetrahedron Letters
IS - 9