摘要:
A process includes reacting, in a reactor having a fixed bed containing a solid catalyst which contains a heterogeneous ion exchange resin, hydrogen sulfide and ethylene oxide in the presence of the solid catalyst to yield a reaction product which contains beta-mercaptoethanol. A reactor system includes the reactor, an ethylene oxide stream, a hydrogen sulfide stream, a fixed bed containing the solid catalyst placed in the reactor, and an effluent stream containing the reaction product. During steady state operation of the reactor in the process and the reactor system, the hydrogen sulfide and the ethylene oxide are present in a mole ratio in a range of about 9:1 to about 20:1.
摘要:
The present invention provides methods, compositions, mixtures and kits utilizing deoxynucleoside triphosphates comprising a 3′-O position capped by a group comprising methylenedisulfide as a cleavable protecting group and a detectable label reversibly connected to the nucleobase of said deoxynucleoside. Such compounds provide new possibilities for future sequencing technologies, including but not limited to Sequencing by Synthesis.
摘要:
A polymerizable photoinitiator represented by Formula (I): and wherein R1, R2 and R3 are independently selected from the group consisting of a hydrogen, an optionally substituted alkyl group and an optionally substituted aryl group or R1 and R3 represent the necessary atoms to form a five to eight membered ring; p, w, y and z are all integers with y representing a value 1 to 6; p representing the sum of w and z; p representing a value of 1 to 6; w = 1 to (p-z) and z = 0 to (p-w); L represents an optionally substituted (p+y)-valent linking group comprising 1 to 14 carbon atoms; A represents a radically polymerizable group selected from the group consisting of an acrylate group, a methacrylate group, a styrene group, an acryl amide group, a methacryl amide group, a maleate group, a fumarate group, an itaconate group, a vinyl ether group, an allyl ether group, an allyl ester group and a vinyl ester group; and X represents a photoinitiating moiety including at least one group capable of initiating a free radical polymerization reaction upon exposure to actinic radiation. Radiation curable compositions including the polymerizable photoinitiator and methods of preparing the polymerizable photoinitiator are also disclosed.
摘要:
According to the present invention, a composition for an optical material contains a compound (a), a compound (b), and a polyisocyanate compound (c), and can suppress the generation of striae defects. The compound (a) is a compound having a structure represented by formula (1).
The compound (b) is a compound having a structure represented by formula (2).
摘要:
The present disclosure relates to lipid compounds of formula (I): wherein: R1 is chosen from a C10-C21 alkyl, a C10-C21 alkenyl having 1-6 double bonds, and a C10-C21 alkynyl having 1-6 triple bonds; R2 and R3 are the same or different and are chosen from hydrogen and a C1-C6 alkyl; X is chosen from O, S, SO, SO2, Si, and Se; n=1 or 3; and P1 is chosen from hydrogen; a C10-C21 alkyl, a C10-C21 alkenyl having 1-6 double bonds, a C10-C21 alkynyl having 1-6 triple bonds, optionally substituted; a group of formula (II) or formula (III), wherein P2, P3, and P4 are chosen from hydrogen, an alkyl, an alkenyl, and an alkynyl, optionally substituted; and a group of formula (IV) or formula (V), wherein P5 is chosen from hydrogen and a C1-C6 alkyl; or a pharmaceutically acceptable salt, complex, or solvate thereof. Also disclosed are pharmaceutical compositions and lipid compositions comprising such compounds, and methods of use thereof, for example in the treatment of diseases related to cardiovascular, metabolic, and inflammatory conditions.
摘要:
The halogen-terminated sulfur-containing polymer of the present invention is a halogen-terminated sulfur-containing polymer represented by the following formula: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒX-(R-S r ) n -R-X wherein R is an ether bond-containing alkyl group having 3 to 26 carbon atoms, X is a halogen atom, n is an integer of 1 to 200, and r has an average of 1 to 5. The halogen-terminated sulfur-containing polymer of the present invention is industrially very useful as a plasticizer of a polysulfide polymer. In addition, the halogen-terminated sulfur-containing polymer of the present invention can be used as a plasticizer for thioether polymers and high polar resins such as vinyl chloride, and an additive for materials that require a high refractive index such as an optical fiber. The halogen-terminated sulfur-containing polymer of the present invention is effective as an intermediate of a thiol group-terminated polysulfide polymer and the like.