Aerobic Photooxidation of Phosphite Esters Using Diorganotelluride Catalysts
摘要:
Diorganotellurides containing bulky aromatic substituents are found to catalyze the photooxidation of phosphite esters using aerobic oxygen as a terminal oxidant. A Hammett plot with substituted triaryl phosphites yielding rho = 2.88 agrees with a nucleophilic oxygen transfer from telluroxide to phosphite.
合成并使用了五种新的配合物[RuCl 2(SIMes)(Ind)(O- p XC 5 H 4)],它们带有不同的对位取代的亚磷酸三苯酯(X = H,OCH 3,CF 3,Cl,SF 5和CN)。研究亚磷酸酯的电子性质对烯烃复分解活性的影响。新的配体和配合物的物理性质的研究是使用理化和DFT计算进行的。配合物的催化活性以具有挑战性的闭环复分解转化为基准,该转化以形成四取代的双键为特征。络合物[RuCl 2(SIMes)(Ind)P(O- pCF 3 C 5 H 4)3 ](3c)表现出特别高的催化活性,优于最先进的催化剂,并在各种基材上进行了进一步测试。
their reactivity in [2+2+2] cycloaddition reactions compared with highly active [CpCo(H2CCHSiMe3)2] (1). Whereas 1 is an excellent precursor for the synthesis of [CpCo(olefin)(phosphite)] complexes (2 a–f), [CpCo(phosphite)2] complexes (3 a–e) were prepared photochemically from [CpCo(cod)]. The complexes were evaluated in the cyclotrimerization reaction of diynes with nitriles yielding pyridines. For
Polymerized cycloolefins using transition metal catalyst and end products thereof
申请人:——
公开号:US20030181607A1
公开(公告)日:2003-09-25
Methods for the addition polymerization of cycloolefins using a cationic Group 10 metal complex and a weakly coordinating anion of the formula:
[(R′)
z
M(L′)
x
(L″)
y
]
b
[WCA]
d
wherein [(R′)
z
M(L′)
x
(L″)
y
] is a cation complex where M represents a Group 10 transition metal; R′ represents an anionic hydrocarbyl containing ligand; L′ represents a Group 15 neutral electron donor ligand; L″ represents a labile neutral electron donor ligand; x is 1 or 2; and y is 0, 1, 2, or 3; and z is 0 or 1, wherein the sum of x, y, and z is 4; and [WCA] represents a weakly coordinating counteranion complex; and b and d are numbers representing the number of times the cation complex and weakly coordinating counteranion complex are taken to balance the electronic charge on the overall catalyst complex.
Catalyst and methods for polymerizing cycloolefins
申请人:The B.F.Goodrich Company
公开号:US20030023013A1
公开(公告)日:2003-01-30
Methods for the addition polymerization of cycloolefins using a cationic Group 10 metal complex and a weakly coordinating anion of the formula:
[(R′)
z
M(L′)
x
(L″)
y
]
b
[WCA]
d
wherein [(R′)
z
M(L′)
x
(L″)
y
] is a cation complex where M represents a Group 10 transition metal; R′ represents an anionic hydrocarbyl containing ligand; L′ represents a Group 15 neutral electron donor ligand; L″ represents a labile neutral electron donor ligand; x is 1 or 2; and y is 0, 1, 2, or 3; and z is 0 or 1, wherein the sum of x, y, and z is 4; and [WCA] represents a weakly coordinating counteranion complex; and b and d are numbers representing the number of times the cation complex and weakly coordinating counteranion complex are taken to balance the electronic charge on the overall catalyst complex.