Abstract:
The present invention is directed to a mild, efficient, and general direct C(sp2)-H bond silylation of terminal olefins. Various embodiments includes methods, each method comprising or consisting essentially of contacting at least one organic substrate comprising a terminal olefinic C—H bond, with a mixture of at least one organosilane, organosilane, or mixture thereof and an alkali metal alkoxide or alkali metal hydroxide, such that the contacting results in the formation of a silylated olefinic product. The systems associated with these methods are also disclosed.
Abstract:
The present invention relates to methods of metathesizing olefins using catalysts previously considered to be practically inactive. The present invention further relates to novel photosensitive compositions, their use as photoresists, and methods related to patterning polymer layers on substrates. Further, modifications to the compositions and method provide for an unprecedented functionalization of the compositions, useful for example in the preparation of sensors, drug delivery systems, and tissue scaffolds. The novel compositions and associated methods also provide for the opportunity to prepare 3-dimensional objects which provide new access to critically dimensioned devices, including for example photonic devices.
Abstract:
The present invention is directed to methods of forming olefins, especially linear alpha olefins from fatty acids or anhydrides, each method comprising: contacting an amount of precursor carboxylic acid anhydride with a palladium catalyst comprising a bidentate bis-phosphine ligand in a reaction mixture so as to form an olefin in a product with the concomittant formation and removal of CO and water from the reaction mixture, either directly or indirectly, wherein the reaction mixture is maintained with a sub-stoichiometric excess of a sacrificial carboxylic acid anhydride, an organic acid, or both, said sub-stoichiometric excess being relative to the amount of the precursor carboxylic acid anhydride. The precursor carboxylic acid anhydride may be added to the reaction mixture directly or formed in situ by the reaction between at least one precursor carboxylic acid with a stoichiometric amount of the sacrificial acid anhydride.
Abstract:
The present invention describes chemical systems and methods for silylating aromatic organic substrates, said system comprising a mixture of (a) at least one organosilane and (b) at least one strong base, said system being substantially free of a transition-metal compound, and said methods comprising contacting a quantity of the organic substrate with a mixture of (a) at least one organosilane and (b) at least one strong base, under conditions sufficient to silylate the aromatic substrate; wherein said system is substantially free of a transition-metal compound.
Abstract:
This disclosure relates compositions comprising upconverting nanocrystals and photoactive compositions and methods using these compositions to modify treat myopia and other ocular conditions. In some cases, the methods use near infrared irradiation to adjust the refractive power of light adjustable ocular lenses. Other methods improve the mechanical strength of the sclera directly.
Abstract:
The present invention is directed to heating devices, and methods of treatment using the same, wherein the heating devices comprise (a) a polymer matrix comprising a matrix of: (i) at least one polymer; and (ii) a plurality of electrically conductive particles distributed within the polymer; and (b) two electrodes in electrical communication with the polymer matrix. The heating devices are highly portable and able to control the heating temperatures within precise limits for prolonged times without the use of any external thermostatic control device, using only low voltage batteries.
Abstract:
The present invention is directed to optical hydrogels, whose shape and/or refractive indices can be catalyzed by the application of light, methods of preparing the same, and optical devices and lenses derived therefrom.
Abstract:
This disclosure is directed to methods of preparing organic aldehydes, each method comprising contacting a terminal olefin with an oxidizing mixture comprising: (a) a dichloro-palladium complex; (b) a copper complex; (c) a source of nitrite; under aerobic reaction conditions sufficient to convert at least a portion of the terminal olefin to an aldehyde.
Abstract:
The disclosure describes methods of metathesizing unsaturated organic compounds, each method comprising contacting at least one feedstock comprising at least one olefinic or acetylenic precursor with a solid transition metal-based metathesis catalyst in the absence of a liquid solvent or precursor to form a polymer product.
Abstract:
This disclosure relates compositions comprising upconverting nanocrystals and photoactive compositions and methods using these compositions to modify treat myopia and other ocular conditions. In some cases, the methods use near infrared irradiation to adjust the refractive power of light adjustable ocular lenses. Other methods improve the mechanical strength of the sclera directly.