Preparation of sterically protected 3,4-bis[(2,4,6-tri-tert-butylphenyl)-phosphinidene]cyclobutene derivatives having ring-fused structures

Organic Letters

Volumn 4, Issue 4, 2002, Pages 569-572

  Yamada, Naoki ^a   Abe, Keita ^a   Toyota, Kozo ^a   Yoshifuji, Masaaki ^a  

^a TOHOKU UNIVERSITY   (Japan)

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ARTICLE;

EID: 0005371611     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol017169h     Document Type: Article

References (41)

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35. 6) = 75.8] and used without purification. Attempted purification of 11 failed because of partial decomposition during the isolation process.
36. The structure was solved with SIR92: Altomare, A.; Burla, M. C.; Camalli, M.; Cascarano, M.; Giacovazzo, C.; Guagliardi, A.; Polidori, G. J. Appl. Crystallogr. 1994, 27, 435.
37. The complete crystal data are deposited at at the Cambridge Crystallographic Data Centre (Nos. CCDC-173600 for (E,E)-5b and CCDC-173599 for 12b).
38. Johnson, C. K.; ORTEP-II, Oak Ridge National Laboratory Report, ORNL-TM-5138, 1976, Oak Ridge, TN.
39. Hydrogen atoms are omitted for clarity. The atoms [C(6)-C(8) and C(39)-C(41)] were disordered, but only atoms with a dominant occupancy factor are displayed. Some selected bond lengths(Å) and angles (deg): P(1)-C(1) 1.661(6); P(2)-C(3), 1.673(5); C(1)-C(2), 1.472(8); C(3)-C(4), 1.481(7); C(1)-C(3), 1.505(8); C(2)-C(4), 1.351(8); C(2)-C(5), 1.509-(9); C(4)-C(9), 1.487(10); P(1)-C(10), 1.859(5); P(2)-C(28), 1.830(5); C(1)-P(1)-C(10), 99.6(2); C(3)-P(2)-C(28), 100.4(2); P(1)-C(1)-C(2), 143.1(4); P(1)-C(1)-C(3), 130.0(4); C(2)-C(1)-C(3), 86.9(5); C(1)-C(2)-C(4), 93.5(4); C(1)-C(2)-C(5), 132.4(6); C(4)-C(2)-C(5), 134.2-(6); P(2)-C(3)-C(1), 130.3(4); P(2)-C(3)-C(4), 142.6(5); C(1)-C(3)-C(4), 87.2(4); C(2)-C(4)-C(3), 92.5(5); C(2)-C(4)-C(9), 134.2(6); C(3)-C(4)-C(9), 133.4(6).
40. The structure was solved with SAPI91: Hai-Fu, F.; Structure Analysis Programs with Intelligent Control, Rigaku Corporation, Tokyo, Japan, 1991.
41. Hydrogen atoms and incorporated solvent molecules are omitted for clarity. Some selected bond lengths (Å) and angles (deg): Pd-P(1), 2.267(2); Pd-P(2), 2.256(2); Pd-Cl(1), 2.329(2); Pd-Cl(2), 2.331(2); P(1)-C(1), 1.654(9); P(2)-C(3), 1.652(8); C(1)-C(2), 1.46(1); C(3)-C(4), 1.49(1); C(1)-C(3), 1.47(1); C(2)-C(4), 1.38(1); C(2)-C(5), 1.49(1); C(4)-C(9), 1.47(1); P(1)-C(10), 1.815(8); P(2)-C(28), 1.799(9); P(1)-Pd-P(2), 85.20(8); Cl(1)-Pd-Cl(2), 93.81(8); P(1)-Pd-Cl(1), 91.23(8); P(2)-Pd-Cl(2) 89.76(8); Pd-P(1)-C(1), 108.4(3); Pd-P(1)-C(10), 137.5(3); Pd-P(2)-C(3), 108.9(3); Pd-P(2)-C(28), 132.8(3); C(1)-P(1)-C(10), 114.1(4); C(3)-P(2)-C(28), 118.2(4); P(1)-C(1)-C(2), 152.7(7); P(1)-C(1)-C(3), 118.9(6); C(2)-C(1)-C(3), 88.4(6); C(1)-C(2)-C(4), 92.8(7); C(1)-C(2)-C(5), 134.8(8); C(4)-C(2)-C(5), 132.4(8); P(2)-C(3)-C(1), 118.6(6); P(2)-C(3)-C(4), 153.3(7); C(1)-C(3)-C(4), 88.0-(6); C(2)-C(4)-C(3), 90.9(7); C(2)-C(4)-C(9), 134.2(8); C(3)-C(4)-C(9), 134.9(8).