{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T00:44:26Z","timestamp":1783557866958,"version":"3.55.0"},"reference-count":22,"publisher":"American Chemical Society (ACS)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Am. Chem. Soc."],"published-print":{"date-parts":[[2008,3,1]]},"DOI":"10.1021\/ja800541c","type":"journal-article","created":{"date-parts":[[2008,3,1]],"date-time":"2008-03-01T10:00:53Z","timestamp":1204365653000},"page":"3771-3773","source":"Crossref","is-referenced-by-count":57,"title":["Easily Immobilized Di- and Tetraphosphine Linkers:\u2009 Rigid Scaffolds that Prevent Interactions of Metal Complexes with Oxide Supports"],"prefix":"10.1021","volume":"130","author":[{"given":"Yuan","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, and Chemistry Department, University of Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bj\u00f6rn","family":"Beele","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, and Chemistry Department, University of Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janet","family":"Bl\u00fcmel","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, and Chemistry Department, University of Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2008,3,1]]},"reference":[{"key":"ja800541cb00001\/ja800541cb00001_1","doi-asserted-by":"crossref","unstructured":"(a)Chem. Rev.Special Issue on \u201cRecoverable Catalysts and Reagents\u201d, Gladysz, J. A., Ed.2002,102, No. 10.","DOI":"10.1021\/cr0103874"},{"key":"ja800541cb00001\/ja800541cb00001_2","volume-title":"VCH:\u2009 Weinheim","author":"Chiral Catalyst Immobilization","year":"2000"},{"key":"ja800541cb00002\/ja800541cb00002_1","doi-asserted-by":"crossref","first-page":"584","DOI":"10.1002\/adsc.200202197","volume":"345","author":"Merckle C.","year":"2003","journal-title":"Adv. Synth. 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Soc."},{"key":"ja800541cb00005\/ja800541cb00005_2","doi-asserted-by":"crossref","first-page":"2753","DOI":"10.1080\/10826079608015108","volume":"19","author":"Behringer K. D.","year":"1996","journal-title":"J. Liq. Chromatogr."},{"key":"ja800541cb00006\/ja800541cb00006_1","unstructured":"Representative syntheses and data:\u2009 (a)1d:\u2009 2 mL of a 1.6 M solution ofnBuLi (3.220 mmol) in hexane was added dropwise to a solution of 256 mg (0.402 mmol) of C(p-C6H4Br)47in 150 mL of ether at \u221278 \u00b0C. Then, the mixture was brought to ambient temperature over 2.5 h, during which time a white suspension formed. After the mixture was cooled to \u221278 \u00b0C, ClPtBu2(0.61 mL, 3.220 mmol) was added, and the mixture was slowly warmed to room temperature. After the mixture was stirred overnight and the solids were filtered off, the solvent was removed in vacuo.1dcould be obtained as a colorless powder and purified by recrystallization from toluene\/ethanol (1:5) (186 mg, 51.6% yield).1H NMR (C6D6):\u2009 \u03b4 = 7.64 (dd,3J(H-H) = 8.2 Hz,3J(P-H) = 6.0 Hz, 8H; PCCH), 7.38 (d,3J(H-H) = 8.2 Hz, 8H; PCCHCH), 1.20 (d,3J(P-H) = 11.4 Hz, 72H; CH3) ppm;13C NMR (C6D6):\u2009 \u03b4 = 136.04 (d,2J(P-C) = 23.0 Hz; PCCH), 135.47 (d,1J(P-C) = 25.2 Hz; PCCH), 130.29 (d,3J(P-C) = 8.2 Hz; PCCHCH), 147.09 (s, PCCHCHC), 65.33 (s, (C6H4)4C), 31.69 (d,1J(P-C) = 23.2 Hz;CCH3), 30.36 (d,2J(P-C) = 14.9 Hz;CH3) ppm;31P NMR (C6D6, 121.5 MHz):\u2009 \u03b4 = 26.42 ppm. HR-MS (FAB+):\u2009 [M]+(100.0%) 897.2048 (calcd. 897.2037). (b)2b:\u2009 A 1.6 M solution ofnBuLi (0.77 mL, 1.23 mmol) in hexane was added dropwise to 100 mg (0.15 mmol) of Si(p-C6H4Br)7ain 70 mL of ether at \u221278 \u00b0C. The solution was warmed up to ambient temperature in the course of 2.5 h. Then, it was cooled down to \u221278 \u00b0C, and 0.16 mL (1.84 mmol) of ClPEt2was added. After having been warmed to room temperature and stirred overnight the solvents were removed in vacuo, and the product was extracted with CH2Cl2.2b(71 mg, 0.1 mmol) was obtained as a colorless waxy material (mp 72 \u00b0C) after removal of the solvent, corresponding to a yield of 66.7%.1H NMR (C6D6):\u2009 \u03b4 = 7.69 (dd,3J(H-H) = 8.0 Hz,4J(P-H) = 0.9 Hz, 8H; PCCHCH), 7.45 (dd,3J(H-H) = 7.9 Hz,3J(P-H) = 6.6 Hz, 8H; PCCH), 1.51 (m, 16H; PCH2), 0.97 (t,3J(H-H) = 7.6 Hz, 12H; CH3), 0.93 (t,3J(H-H) = 7.6 Hz, 12H; CH3) ppm;13C NMR (C6D6):\u2009 \u03b4 = 141.84 (d,1J(P-C) = 10.4 Hz; PCCH), 136.68 (d,3J(P-C) = 5.8 Hz; PCCHCH), 134.51 (s, SiC), 132.05 (d,2J(P-C) = 17.4 Hz; PCCH), 20.11 (d,1J(P-C) = 12.4 Hz; PCH2), 10.06 (d,2J(P-C) = 14.1 Hz;CH3) ppm;31P NMR (C6D6, 121.5 MHz):\u2009 \u03b4 = \u221216.17 ppm;29Si NMR (C6D6, 99.4 MHz):\u2009 \u03b4 = \u221214.9 ppm. HR-MS (FAB+):\u2009 [M]+(41.9%) 688.3041 (calcd. 688.3102), [M\u2212Et]+(39.6%) 659.2729 (calcd. 659.2711), [M\u2212PEt2]+(11.9%) 599.2458 (calcd. 599.2582). (c)Sn(p-C6H4Br)4:\u2009 1,4-Dibromobenzene (5.89 g, 24.97 mmol) was dissolved in 60 mL of ether and cooled to \u221215 \u00b0C. Then 15.6 mL of a 1.6 M solution ofnBuLi (24.97 mmol) in hexane was added dropwise. After having been stirred for 15 min the reaction mixture was cooled to \u221278 \u00b0C, and 0.73 mL (6.25 mmol) of SnCl4was added dropwise. After the mixture was stirred for 12 h at ambient temperature, 20 mL of 1 M HCl was added, and the product was extracted with ether. The organic phase was washed with H2O and dried with MgSO4. Sn(p-C6H4Br)4was obtained after filtration, removal of the solvent in vacuo, and recrystallization with CHCl3as a colorless crystalline powder in 89.0% yield (4.12 g, 5.56 mmol). mp 214 \u00b0C.1H NMR (CDCl3):\u2009 \u03b4 = 7.56 (d,3J(H-H) = 8.1 Hz,4J(119\/7Sn-H) = 12.1\/7.6 Hz, 8H; SnCCHCH), 7.39 (d,3J(H-H) = 8.1 Hz,3J(119\/7Sn-H) = 47.6\/45.7 Hz, 8H; SnCCH);13C NMR (CDCl3):\u2009 \u03b4 = 138.29 (2J(119\/7Sn-C) = 42.1\/40.3 Hz; SnCCH), 135.01 (1J(119\/7Sn-C) = 541.8\/517.8; SnC), 132.09 (3J(119\/7Sn-C) = 54.8\/53.3 Hz; BrCCH), 124.76 (4J(119\/7Sn-C) = 14.4 Hz; BrC);119Sn NMR (CDCl3, 186.5 MHz):\u2009 \u03b4 = \u2212118.58 ppm. HR-MS (FAB+):\u2009 [M]+(55.9%) 739.6893 (calcd. 739.7007), [M\u2212Br]+(29.8%) 660.7740 (calcd. 660.7824)."},{"key":"ja800541cb00007\/ja800541cb00007_1","doi-asserted-by":"crossref","first-page":"376","DOI":"10.1139\/v03-056","volume":"81","author":"Fournier J.-H.","year":"2003","journal-title":"Can. J. 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