| 138234-16-9

• 分子结构分类: 有机化合物 - 有机磷化合物 - 有机膦及其衍生物
• CAS: 138234-16-9
• 化学式: C₂₄H₅₀P₂Pd
• 分子量: 507.029
• InChiKey: INARIGCSZLAHOO-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
  None
• 可旋转键数：
  None
• 环数：
  None
• sp3杂化的碳原子比例：
  None
• 拓扑面积：
  None
• 氢给体数：
  None
• 氢受体数：
  None

反应信息

• 作为反应物：
  描述：

  乙炔-1,2-D2 、 以 乙醚 为溶剂， 生成
  参考文献：
  名称：

  (R2PC2H4PR2)Pd0 alkene and ethyne complexes

  摘要：

  The palladium eta(3)-allyl complex Pd(eta(3)-C3H5)2 reacts with bidentate phosphanes iPr2PC2H4PiPr2 and tBu2PC2H4PtBu2 below -30-degrees-C to yield the light yellow, microcrystalline palladium(II) eta(1)-allyl compounds (R2PC2H4PR2)Pd(eta(1)-C3H5)2 (R = (i)Pr (1), (t)Bu (2)), which are stable to about -30-degrees-C. Above -30-degrees-C, the allyl substituents of 1 and 2 couple with reduction of palladium to form a mixture of (R2PC2H4PR2)Pd0 1,5-hexadiene complexes. When this reaction is carried out in 1,5-hexadiene, the complexes (R2PC2H4PR2)Pd(eta(2)-C6H10) (R = (i)Pr (3), (t)Bu (4)) are obtained in pure form. According to IR and NMR spectral data, the palladium atoms in 3 and 4 are coordinated at low temperature by the chelating diphosphane and (statically) by one of the two diene double bonds in a trigonal-planar geometry. At higher temperatures, a rapid exchange of the coordinated and uncoordinated double bonds occurs, passing through an intermediate with C2 symmetry. When suspensions of 1 in pentane and 2 in THF are warmed to 20-degrees-C, dinuclear diastereomers rac-/meso-{(R2PC2H4PR2)Pd}2(mu-eta(2):eta(2)-C6H10) (R = (i)Pr (5a,b), (t)Bu (6a,b)) are obtained, which upon treatment with 1,5-hexadiene furnish mononuclear derivatives 3 and 4. Similarly, when 1 is reacted with 1,5-cyclooctadiene at 20-degrees-C, the mono- and dinuclear interconvertible complexes ((i)Pr2PC2H4P(i)Pr2)Pd(eta(2)-C8H12) (7) and {((i)Pr2PC2H4P(i)Pr2)Pd}2(mu-eta(2):eta(2)-C8H12) (8) are produced. From the reaction of 1 and 2 with ethene, stable complexes (R2PC2H4PR2)Pd(C2H4) (R = (i)Pr (9), colorless; R = (t)Bu (10), tan) result. The colorless mononuclear palladium(0) ethyne complexes (R2PC2H4PR2)Pd(C2H2) (R = (i)Pr (11), (t)Bu (12)) may be prepared (a) by a displacement reaction of one of the isolated alkene complexes with ethyne, (b) by a reductive elimination and concomitant displacement reaction of the eta(1)-allyl complexes 1 and 2 with ethyne, or (c) in a one-pot synthesis from either Pd(eta(3)-C3H5)2 or Pd(eta(3)-2-MeC3H4)2 with (i)Pr2PC2H4P(i)Pr2 or (t)Bu2PC2H4P(t)Bu2, respectively, and ethyne in excess. When the mononuclear ethyne complexes 11 and 12 are combined with an equimolar amount of the corresponding eta(1)-allyl complex 1 or 2, or the alkene complexes (especially the mononuclear 1,5-hexadiene (3, 4) or ethene (9, 10) derivatives), yellow dinuclear palladium(0) complexes {(R2PC2H4PR2)Pd}2(mu-C2H2) (R = (i)Pr (13), (t)Bu (14)) are produced, in which the ethyne ligand bridges two palladium atoms. All the (diphosphane)palladium(0) alkene (3-10) and ethyne complexes (11-14) exhibit a trigonal-planar coordination geometry about the palladium atom. Most of the compounds have been isolated in high yield.

  DOI：

  10.1021/om00039a023
• 作为产物：
  描述：

  、 1,5-已二烯 以 further solvent(s) 为溶剂， 以77%的产率得到
  参考文献：
  名称：

  (R2PC2H4PR2)Pd0 alkene and ethyne complexes

  摘要：

  The palladium eta(3)-allyl complex Pd(eta(3)-C3H5)2 reacts with bidentate phosphanes iPr2PC2H4PiPr2 and tBu2PC2H4PtBu2 below -30-degrees-C to yield the light yellow, microcrystalline palladium(II) eta(1)-allyl compounds (R2PC2H4PR2)Pd(eta(1)-C3H5)2 (R = (i)Pr (1), (t)Bu (2)), which are stable to about -30-degrees-C. Above -30-degrees-C, the allyl substituents of 1 and 2 couple with reduction of palladium to form a mixture of (R2PC2H4PR2)Pd0 1,5-hexadiene complexes. When this reaction is carried out in 1,5-hexadiene, the complexes (R2PC2H4PR2)Pd(eta(2)-C6H10) (R = (i)Pr (3), (t)Bu (4)) are obtained in pure form. According to IR and NMR spectral data, the palladium atoms in 3 and 4 are coordinated at low temperature by the chelating diphosphane and (statically) by one of the two diene double bonds in a trigonal-planar geometry. At higher temperatures, a rapid exchange of the coordinated and uncoordinated double bonds occurs, passing through an intermediate with C2 symmetry. When suspensions of 1 in pentane and 2 in THF are warmed to 20-degrees-C, dinuclear diastereomers rac-/meso-{(R2PC2H4PR2)Pd}2(mu-eta(2):eta(2)-C6H10) (R = (i)Pr (5a,b), (t)Bu (6a,b)) are obtained, which upon treatment with 1,5-hexadiene furnish mononuclear derivatives 3 and 4. Similarly, when 1 is reacted with 1,5-cyclooctadiene at 20-degrees-C, the mono- and dinuclear interconvertible complexes ((i)Pr2PC2H4P(i)Pr2)Pd(eta(2)-C8H12) (7) and {((i)Pr2PC2H4P(i)Pr2)Pd}2(mu-eta(2):eta(2)-C8H12) (8) are produced. From the reaction of 1 and 2 with ethene, stable complexes (R2PC2H4PR2)Pd(C2H4) (R = (i)Pr (9), colorless; R = (t)Bu (10), tan) result. The colorless mononuclear palladium(0) ethyne complexes (R2PC2H4PR2)Pd(C2H2) (R = (i)Pr (11), (t)Bu (12)) may be prepared (a) by a displacement reaction of one of the isolated alkene complexes with ethyne, (b) by a reductive elimination and concomitant displacement reaction of the eta(1)-allyl complexes 1 and 2 with ethyne, or (c) in a one-pot synthesis from either Pd(eta(3)-C3H5)2 or Pd(eta(3)-2-MeC3H4)2 with (i)Pr2PC2H4P(i)Pr2 or (t)Bu2PC2H4P(t)Bu2, respectively, and ethyne in excess. When the mononuclear ethyne complexes 11 and 12 are combined with an equimolar amount of the corresponding eta(1)-allyl complex 1 or 2, or the alkene complexes (especially the mononuclear 1,5-hexadiene (3, 4) or ethene (9, 10) derivatives), yellow dinuclear palladium(0) complexes {(R2PC2H4PR2)Pd}2(mu-C2H2) (R = (i)Pr (13), (t)Bu (14)) are produced, in which the ethyne ligand bridges two palladium atoms. All the (diphosphane)palladium(0) alkene (3-10) and ethyne complexes (11-14) exhibit a trigonal-planar coordination geometry about the palladium atom. Most of the compounds have been isolated in high yield.

  DOI：

  10.1021/om00039a023

文献信息

• A Palladium-Catalyzed Stannole Synthesis
  作者：Jochen Krause、Karl-Josef Haack、Klaus-Richard Pörschke、Barbara Gabor、Richard Goddard、Christian Pluta、Klaus Seevogel

  DOI：10.1021/ja952495b

  日期：1996.1.1

  A palladium-catalyzed (2 + 2 + 1) cycloaddition reaction of two C2H2 and one SnR(2) to form C-unsubstituted stannoles (C4H4)SnR(2) [R = CH(SiMe(3))(2) 2a, R(2) = C(SiMe(3))(2)CH2}(2) 2c] is described. Catalysts are (R'(2)PC(2)H(4)PR'(2))Pd complexes (slow reaction) and (R'P-3)(2)Pd complexes (fast reaction). The mechanism of the catalysis has been elucidated in detail from stoichiometric reactions based on R = CH(SiMe(3))(2). For the [(R'(2)PC(2)H(4)PR'(2))Pd]-catalyzed system, the starting Pd(0)-ethene complexes (R'(2)PC(2)H(4)PR'(2))Pd(C2H4) (R' = Pr-i (3),(t)Bu (4)) react both with ethyne to give the Pd(0)-ethyne derivatives (R'(2)PC(2)H(4)PR'(2))Pd(C2H2) (R' = Pr-i (5), (t)Bu (6)) and with SnR(2) to yield the Pd(0)-Sn(II) adducts (R'(2)PC(2)H(4)PR'(2))Pd=SnR(2) (R' = Pr-i (7), (t)Bu (8)). The Pd-Sn bond [2.481(2) Angstrom] of 7 is very short, indicative of partial multiple bonding. Subsequent reactions of the Pd(0)-ethyne complexes 5 and 6 with SnR(2) or of the Pd(0)-Sn(II) complexes 7 and 8 with ethyne afford the 1,2-palladastannete complexes (R'2PC2H4-PR'(2))Pd(CH=CH)SnR(2) (Pd-Sn) (R' = Pr-i (10), (t)Bu (11)). The derivative with R' = Me (9) has also been synthesized. In 10 a Pd-Sn single bond [2.670(1) Angstrom] is present. Complexes 10 and 11 (as well as 7 and 8 but not 9) react slowly with additional ethyne at 20 degrees C to reform the Pd(0)-ethyne complexes 5 and 6 with concomitant generation of the stannole (C4H4)SnR(2) (2a). Likely intermediates of this reaction are the Pd(0)-eta(2)-stannole complexes (R'(2)PC(2)H(4)PR'(2))Pd(eta(2)-C(4)H(4)SnR(2)) (R' = Pr-i (12), (t)Bu (13)), which have been synthesized independently. The stannole ligand in 12, 13 is easily displaced by ethyne to yield 5 or 6 or by SnR(2) to yield 7 or 8. Thus, the isolated complexes 5-8 and 10-13 are conceivable intermediates of the catalytic stannole formation, and from their stoichiometric reactions the catalysis cycle can be assembled. For the [(R'P-3)(2)Pd]-catayyze system, the corresponding intermediates (Me(3)P)(2)Pd(C2H2) (15), ((Pr3P)-Pr-i)(2)Pd(C2H2) (17), (Me(3)P)(2)Pd=SnR(2) (18), ((Pr3P)-Pr-i)(2)Pd=SnR(2) (20), and (Me(3)P)(2)Pd(CH=CH)SnR(2) (Pd-Sn) (19) have been isolated or detected by NMR, and ((Pr3P)-Pr-i)(2)Pd(CH=CH)SnR(2) (Pd-Sn) (21) is postulated as an intermediate. The [(Me(3)P)(2)Pd] system (stannole formation above 0 degrees C) is catalytically more active than any of the [(R'(2)PC(2)H(4)PR'(2))Pd] systems (slow stannole formation for R' = (t)Bu at 20 degrees C). Most active is the [((Pr3P)-Pr-i)(2)Pd] system, allowing a catalytic synthesis of the stannole 2a from SnR(2) and ethyne at -30 degrees C [1% of 17; yield 2a: 87%; TON (turnover number): 87].By carrying out the catalysis in pentane at 20 degrees C (0.04% of 17), the TON is increased to 1074 but the yield of 2a is diminished to 43% due to uncatalyzed thermal side reactions.
• (R2PC2H4PR2)Pd0 alkene and ethyne complexes
  作者：Jochen Krause、Werner Bonrath、Klaus R. Poerschke

  DOI：10.1021/om00039a023

  日期：1992.3

  The palladium eta(3)-allyl complex Pd(eta(3)-C3H5)2 reacts with bidentate phosphanes iPr2PC2H4PiPr2 and tBu2PC2H4PtBu2 below -30-degrees-C to yield the light yellow, microcrystalline palladium(II) eta(1)-allyl compounds (R2PC2H4PR2)Pd(eta(1)-C3H5)2 (R = (i)Pr (1), (t)Bu (2)), which are stable to about -30-degrees-C. Above -30-degrees-C, the allyl substituents of 1 and 2 couple with reduction of palladium to form a mixture of (R2PC2H4PR2)Pd0 1,5-hexadiene complexes. When this reaction is carried out in 1,5-hexadiene, the complexes (R2PC2H4PR2)Pd(eta(2)-C6H10) (R = (i)Pr (3), (t)Bu (4)) are obtained in pure form. According to IR and NMR spectral data, the palladium atoms in 3 and 4 are coordinated at low temperature by the chelating diphosphane and (statically) by one of the two diene double bonds in a trigonal-planar geometry. At higher temperatures, a rapid exchange of the coordinated and uncoordinated double bonds occurs, passing through an intermediate with C2 symmetry. When suspensions of 1 in pentane and 2 in THF are warmed to 20-degrees-C, dinuclear diastereomers rac-/meso-(R2PC2H4PR2)Pd}2(mu-eta(2):eta(2)-C6H10) (R = (i)Pr (5a,b), (t)Bu (6a,b)) are obtained, which upon treatment with 1,5-hexadiene furnish mononuclear derivatives 3 and 4. Similarly, when 1 is reacted with 1,5-cyclooctadiene at 20-degrees-C, the mono- and dinuclear interconvertible complexes ((i)Pr2PC2H4P(i)Pr2)Pd(eta(2)-C8H12) (7) and ((i)Pr2PC2H4P(i)Pr2)Pd}2(mu-eta(2):eta(2)-C8H12) (8) are produced. From the reaction of 1 and 2 with ethene, stable complexes (R2PC2H4PR2)Pd(C2H4) (R = (i)Pr (9), colorless; R = (t)Bu (10), tan) result. The colorless mononuclear palladium(0) ethyne complexes (R2PC2H4PR2)Pd(C2H2) (R = (i)Pr (11), (t)Bu (12)) may be prepared (a) by a displacement reaction of one of the isolated alkene complexes with ethyne, (b) by a reductive elimination and concomitant displacement reaction of the eta(1)-allyl complexes 1 and 2 with ethyne, or (c) in a one-pot synthesis from either Pd(eta(3)-C3H5)2 or Pd(eta(3)-2-MeC3H4)2 with (i)Pr2PC2H4P(i)Pr2 or (t)Bu2PC2H4P(t)Bu2, respectively, and ethyne in excess. When the mononuclear ethyne complexes 11 and 12 are combined with an equimolar amount of the corresponding eta(1)-allyl complex 1 or 2, or the alkene complexes (especially the mononuclear 1,5-hexadiene (3, 4) or ethene (9, 10) derivatives), yellow dinuclear palladium(0) complexes (R2PC2H4PR2)Pd}2(mu-C2H2) (R = (i)Pr (13), (t)Bu (14)) are produced, in which the ethyne ligand bridges two palladium atoms. All the (diphosphane)palladium(0) alkene (3-10) and ethyne complexes (11-14) exhibit a trigonal-planar coordination geometry about the palladium atom. Most of the compounds have been isolated in high yield.