Abstract:
The present invention is directed to the synthesis of novel stable open metal clusters by selective oxidation of bound ligands. The synthesis comprises, for example, using an amine based oxidant for decarbonylation of specific carbonyl ligands. The synthesis can also comprise further removal of a bound amine group by an acid. The resulting metal cluster contains a coordinatively unsaturated site comprising a carbonyl vacancy. The resulting metal cluster can be used as a catalyst in a variety of chemical transformations.
Abstract:
The disclosure is directed to: (a) phosphacycle ligands; (b) catalyst compositions comprising phosphacycle ligands; and (c) methods of using such phosphacycle ligands and catalyst compositions in bond forming reactions.
Abstract:
The disclosure is directed to: (a) phosphacycle ligands; (b) catalyst compositions comprising phosphacycle ligands; and (c) methods of using such phosphacycle ligands and catalyst compositions in bond forming reactions.
Abstract:
Among other things, this disclosure provides an olefin oligomerization system and process, the system comprising: a) a transition metal compound; b) a pyrrole compound having a hydrogen atom on at the 5-position or the 2- and 5-position of a pyrrole compound and having a bulky substituent located on each carbon atom adjacent to the carbon atom bearing a hydrogen atom at the 5-position or the 2- and 5-position of a pyrrole compound. These catalyst system have significantly improved productivities, selectivities to 1-hexene, and provides higher purity 1-hexene within the C6 fraction than catalyst systems using 2,4-dimethylpyrrole.
Abstract:
Compounds having the formula are disclosed. M1 and M2 are the same or different and are transition metal atoms or ions; Z2 and Z3, independently, are the atoms necessary to complete a 3-12 membered heterocyclic ring; Z1 is an alkylene or arylene group; Q1 and Q2 are the same or different and are electron withdrawing groups; L1 and L3, taken together, represent —O—CR13—O—; L2 and L4, taken together, represent —O—CR14—O—; and R13 and R14 are the same or different and are selected from the group consisting of alkyl groups and aryl groups or R13 and R14 represent alkylene or arylene groups that are directly or indirectly bonded to one another. Methods for making such compounds are also disclosed, as are intermediates which can be used in their preparation. Also disclosed are methods for carrying out C—H insertion reactions using bis-transition metal catalysts, such as the above compounds. Procedures for preparing d-threo methylphenidate, tolterodine, CDP-840, nominfensine, and sertraline, are described.
Abstract translation:公开了具有式的化合物。 M 1和M 2相同或不同,为过渡金属原子或离子; Z 2和Z 3独立地是完成3-12元杂环所必需的原子; Z 1是亚烷基或亚芳基; Q 1和Q 2是相同或不同的并且是吸电子基团; L 1和L 3一起表示-O-CR 13 -O-; L 2和L 4一起表示-O-CR 14 -O-。 并且R 13和R 14相同或不同,并且选自烷基和芳基,或者R 13和R 14代表直接或间接键合到 另一个。 还公开了制备这些化合物的方法,以及可以用于其制备的中间体。 还公开了使用双过渡金属催化剂如上述化合物进行C-H插入反应的方法。 描述了制备d-苏式哌甲酯,托特罗定,CDP-840,延胡素和舍曲林的方法。
Abstract:
Compounds having the formula: 1 are disclosed. M1 and M2 are the same or different and are transition metal atoms or ions; Z2 and Z3, independently, are the atoms necessary to complete a 3-12 membered heterocyclic ring; Z1 is an alkylene or arylene group; Ql and Q2 are the same or different and are electron withdrawing groups; L1 and L3, taken together, represent nullOnullCR13nullOnull; L2 and L4, taken together, represent nullOnullCR14nullnullOnull; and R13 and R14 are the same or different and are selected from the group consisting of alkyl groups and aryl groups or R13 and R14 represent alkylene or arylene groups that are directly or indirectly bonded to one another. Methods for making such compounds are also disclosed, as are intermediates which can be used in their preparation. Also disclosed are methods for carrying out CnullH insertion reactions using bis-transition metal catalysts, such as the above compounds. Procedures for preparing d-threo methylphenidate, tolterodine, CDP-840, nominfensine, and sertraline, are described.
Abstract:
The present invention relates generally to catalysts and processes for the Z-selective formation of internal olefin(s) from terminal olefin(s) via homo-metathesis reactions.
Abstract:
The disclosure is directed to: (a) phosphacycle ligands; (b) catalyst compositions comprising phosphacycle ligands; and (c) methods of using such phosphacycle ligands and catalyst compositions in bond forming reactions.
Abstract:
The invention provides complexes in which ligands (e.g., calixarene-related compounds) are coordinated to a metal colloid, e.g. a gold colloid. In exemplary embodiments, two or more ligands complexed to the metal colloid are larger than the metal colloid, thus providing an accessible metal center. The complexes can be immobilized on a substrate. The complexes of the invention are useful as tunable and highly robust isolated metal colloids that find use in binding of molecules and catalysis of chemical reactions.
Abstract:
The present invention is directed to the synthesis of novel stable open metal clusters by selective oxidation of bound ligands. The synthesis comprises, for example, using an amine based oxidant for decarbonylation of specific carbonyl ligands. The synthesis can also comprise further removal of a bound amine group by an acid. The resulting metal cluster contains a coordinatively unsaturated site comprising a carbonyl vacancy. The resulting metal cluster can be used as a catalyst in a variety of chemical transformations.