摘要:
Embodiments in accordance with the present invention provide for forming essentially pure diastereomers of 5/6-substituted norbornene-type monomers. Further, embodiments in accordance with the present invention encompass polymerizing such diastereomers to form addition or ROMP polymers where a desired exo-/endo-ratio of the diastereomers is provided to the polymerization, such ratio designed to provide a desired ratio of endo-/exo-structured repeating units for a resulting polymer to have desired physical or chemical properties.
摘要:
Compounds and pharmaceutically acceptable salts of the compounds are disclosed, wherein the compounds have the structure of Formula I: wherein R2, R6A, R6B and R8 are as defined in the specification. Corresponding pharmaceutical compositions, methods of treatment, synthetic methods, and intermediates are also disclosed.
摘要:
A compound of Formula (I): or a pharmaceutically and/or veterinarily acceptable derivative thereof, wherein R1, R2, R3, R4, R5, and R8 are as defined above.
摘要翻译:式(I)的化合物或其药学上可接受的衍生物,其中R 1,R 2,R 3, R 4,R 5,R 8和R 8如上所定义。
摘要:
A system and method are provided for decoding an audio signal. In one embodiment, a first pulse is identified with a predetermined relative duration with respect to a second pulse. A sampling frequency is then calculated based on such identification. In another embodiment, an audio signal is decoded utilizing a threshold. In still yet another embodiment, a decoder is provided for decoding an audio signal utilizing a clock that is independent of the audio signal.
摘要:
Palladium compound compositions are provided in accordance with Formulae [((R)3E)aPd(Q)(LB)b]p [WCA]r, where ((R)3E) is a Group 15 electron donor ligand, Q is an anionic ligand, LB is a Lewis base, WCA is a weakly coordinating anion, a is 1, 2 or 3, b is 0, 1 or 2, the sum of a and b is 1, 2 or 3 and each of p and r is an integer such that the molecular charge is zero, or [(E(R)3)(E(R)2R*)Pd(LB)]p[WCA]r where E(R)2R* represents a Group 15 neutral electron donor ligand and where R* is an anionic hydrocarbyl containing moiety, bonded to the Pd and having a β hydrogen with respect to the Pd center. Such compound composition exhibits latent polymerization activity in the presence of polycyclic olefins.
摘要翻译:钯化合物组合物按照式[((R)3))提供:Pd(Q)(LB)b 其中((R)3E)是第15族电子给体配体,Q是阴离子配位体,LB是一种(Ⅴ) 路易斯碱,WCA是弱配位阴离子,a为1,2或3,b为0,1或2,a和b之和为1,2或3,p和r各自为整数,使得 分子电荷为零,或[(E(R)3 N)(E(R)2 R *)Pd(LB)] p < 其中E(R)2 R *代表第15族中性电子给体配体,其中R *是含有部分阴离子烃基的部分,键合到Pd和 相对于Pd中心具有β氢。 这种化合物组合物在多环烯烃的存在下表现出潜在的聚合活性。
摘要:
Methods for the addition polymerization of cycloolefins using a cationic Group 10 metal complex and a weakly coordinating anion of the formula: [(R′)zM(L′)x(L″)y]b[WCA]d wherein [(R′)zM(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.
摘要:
A rotary drill bit is manufactured by a powder metallurgy process by placing a metal mandrel in a mold, packing the mold with particulate matrix-forming material, infiltrating the material with a molten binding alloy, and cooling the assembly to form a solid infiltrated matrix bonded to the mandrel. The mandrel comprises an outer part surrounded by the matrix-forming material and an inner part, secured to the outer part but out of contact with the matrix-forming material. The outer part of the mandrel is formed from a material having thermal characteristics close to those of the matrix, so as to reduce the tendency for the matrix to crack under thermal stress, while the inner part of the mandrel is formed from a precipitation-hardening material, the strength and hardness of which increases in the infiltration process and the subsequent heating/cooling cycle for brazing the cutters on to the drill bit. The threaded shank of the drill bit is formed directly on the inner part since it will have sufficient strength and hardness for this purpose.
摘要:
Molybdenum and tungsten compounds that are useful as catalyst precursors in the metathesis of olefins have the general formula:M(Y) (OR.sup.2).sub.x (R.sup.3).sub.y (X).sub.z L.sub.swherein M is tungsten or molybdenum; Y is oxygen or NR.sup.1 ; R.sup.1, R.sup.2, and R.sup.3 are the same or different and are selected from alkyl, cycloalkyl, cycloalkenyl, polycycloalkyl, polycycloalkenyl, haloalkyl, haloaralkyl, substituted or unsubstituted aralkyl and aryl groups, and silicon-containing analogs thereof; L is a Lewis base; X is halogen; s is 0 or 1; x+y+z=4, and y.gtoreq.1, provided that when x is 2 or more, two OR.sup.2 groups can be replaced by a chelating ligand (OR.sup.2).sub.2.These compounds can be used for the metathesis of olefins in neat metathesizable olefin, as well as in solution, and require only the input of energy to be converted to active catalysts.
摘要翻译:在烯烃复分解中可用作催化剂前体的钼和钨化合物具有通式:M(Y)(OR2)x(R3)y(X)zLs,其中M是钨或钼; Y是氧或NR1; R 1,R 2和R 3相同或不同,并且选自烷基,环烷基,环烯基,多环烷基,多环烯基,卤代烷基,卤代烷基,取代或未取代的芳烷基和芳基及其含硅类似物; L是路易斯碱; X是卤素; s为0或1; x + y + z = 4,y> / = 1,条件是当x为2以上时,两个OR 2基团可以被螯合配体(OR2)2代替。 这些化合物可用于纯净的可再熔烯烃和溶液中的烯烃的复分解,并且仅需要将能量的输入转化为活性催化剂。
摘要:
Molybdenum and tungsten compounds that are useful as catalyst precursors in the metathesis of olefins have the general formula:M(Y)(OR.sup.2).sub.x (R.sup.3).sub.y (X).sub.z L.sub.swherein M is tungsten or molybdenum; Y is oxygen or NR.sup.1 ; R.sup.1, R.sup.2, and R.sup.3 are the same or different and are selected from alkyl, cycloalkyl, cycloalkenyl, polycycloalkyl, polycycloalkenyl, haloalkyl, haloaralkyl, substituted or unsubstituted aralkyl and aryl groups, and silicon-containing analogs thereof; L is a Lewis base; X is halogen; s is 0 or 1; x+y+z=4, and y.gtoreq.1, provided that when x is 2 or more, two OR.sup.2 groups can be replaced by a chelating ligand (OR.sup.2).sub.2.These compounds can be used for the metathesis of olefins in neat metathesizable olefin, as well as in solution, and require only the input of energy to be converted to active catalysts.
摘要翻译:在烯烃复分解中可用作催化剂前体的钼和钨化合物具有通式:M(Y)(OR2)x(R3)y(X)zLs,其中M是钨或钼; Y是氧或NR1; R 1,R 2和R 3相同或不同,并且选自烷基,环烷基,环烯基,多环烷基,多环烯基,卤代烷基,卤代烷基,取代或未取代的芳烷基和芳基及其含硅类似物; L是路易斯碱; X是卤素; s为0或1; x + y + z = 4,y> / = 1,条件是当x为2以上时,两个OR 2基团可以被螯合配体(OR2)2代替。 这些化合物可用于纯净的可再熔烯烃和溶液中的烯烃的复分解,并且仅需要将能量的输入转化为活性催化剂。
摘要:
A process for preparing molded objects wherein a liquid reaction mass comprised of a metathesis polymerizable cycloolefin, a metathesis polymerization catalyst, a catalyst activator and a reaction rate moderator are charged to a mold wherein polymerization will take place, the improvement wherein said catalyst activator comprises a dialkylzinc compound. Significantly increased gel and cure times are obtained with the dialkylzinc compounds as compared to the use of aluminum alkyl activator compounds. The gel and cure times may be further controlled by the addition of a phenolic compound to the tungsten or molybdenum compound or by the addition of a Lewis base.