Abstract:
Provided herein are methods for the preparation of high purity stannous oxide comprising: (a) reacting a Sn salt with a C2-12 dicarboxylic acid in the aqueous phase to form a suspension comprising a Sn-dicarboxylate complex; (b) washing the Sn-dicarboxylate complex with water to obtain a wash solution comprising a washed Sn-dicarboxylate complex essentially free of the anion of the Sn salt; and (c) reacting the washed Sn-dicarboxylate complex with a base to form high purity SnO, wherein the high purity SnO has an alpha radiation count of less than about 0.002 cph/cm2.
Abstract:
The invention is drawn to a composition comprising a tin(II) 2-hydroxycarboxylate, where the 2-hydroxycarboxylate is preferably selected from the group consisting of glycolate, lactate, mandelate and 2-hydroxybutyrate. The tin(II) 2-hydroxycarboxylates may be prepared by a method comprising the steps of (a) providing an aqueous solution of a tin(II) salt, (b) adding a 2-hydroxycarboxylic acid, or a salt of a 2-hydroxycarboxylic acid, (c) further adding a base, wherein the tin(II) 2-hydroxycarboxylate precipitates, (d) optionally, isolating the tin(II) 2-hydroxycarboxylate, and (e) optionally, drying. The tin(II) 2-hydroxycarboxylates and compositions containing them are useful in oral care applications, and as catalysts for chemical condensation reactions and/or the production of polymers.
Abstract:
Provided are methods of producing phosphitylated compounds, including 3'-Ophosphoramidites, comprising the step of reacting a hydroxyl-containing compound with a phosphitylating agent in the presence of a phosphitylation activator selected from the group consisting of (1) acid-base complexes derived from an amine base of Formula (I) wherein R, R , and R are independently C1-C10 alkyl, C1-C10 cycloalkyl, C1-Cl0 aryl, Cl-C10 aralkyl, Cl-C10 heteroalkyl, or Cl-CIO heteroaryl; (2) acid-base complexes derived from an amine base of Formula (II) wherein R , R , R , R , and are independently hydrogen, C1-C10 alkyl, Cl-C10 cycloalkyl, Cl-C10 aryl, Cl-CIO aralkyl, Cl-CIO heteroalkyl, or C1-C10 heteroaryl, and at least one of R , R , R , R , and R is not hydrogen.; (3) acid-base complexes derived from a diazabicyclo amine base; (4) zwitterionic amine complexes; and (5) combinations of two or more thereof, to produce a phosphitylated compound.
Abstract:
Provided herein are methods for the preparation of high purity stannous oxide comprising: (a) reacting a Sn salt with a C2-12 dicarboxylic acid in the aqueous phase to form a suspension comprising a Sn-dicarboxylate complex; (b) washing the Sn-dicarboxylate complex with water to obtain a wash solution comprising a washed Sn-dicarboxylate complex essentially free of the anion of the Sn salt; and (c) reacting the washed Sn-dicarboxylate complex with a base to form high purity SnO, wherein the high purity SnO has an alpha radiation count of less than about 0.002 cph/cm2.
Abstract translation:本文提供了制备高纯度氧化亚锡的方法,包括:(a)在水相中使Sn盐与C 2-12二羧酸反应以形成包含Sn-二羧酸络合物的悬浮液; (b)用水洗涤所述Sn-二羧酸络合物,得到包含基本上不含Sn盐的阴离子的经洗涤的Sn-二羧酸盐络合物的洗涤溶液; 和(c)使经洗涤的Sn-二羧酸酯配合物与碱反应以形成高纯度SnO,其中高纯度SnO具有小于约0.002cph / cm 2的α辐射计数。
Abstract:
Conductive polymers and a method of forming conductive polymers. More particularly, a method of forming head-to-tail coupled regioregular poly-(3-substituted) thiophenes having improved charge carrier mobility and current modulation. Also, monomers having two different halogen leaving groups and which form regioregular poly-(3-substituted) thiophenes more efficiently and economically than other processes. Polythiophene polymers, films and articles are also provided.
Abstract:
Provided are methods of producing phosphitylated compounds, including 3'-O-phosphoramidites, comprising the step of reacting a hydroxyl-containing compound with a phosphitylating agent in the presence of a phosphitylation activator selected from the group consisting of: (1) acid-base complexes derived from an amine base of Formula II wherein R 3 , R 4 , R 5 , R 6 , and R 7 are independently hydrogen, C 1 -C 10 alkyl, C 3 -C 10 cycloalkyl, C 6 -C 10 aryl, C 7 -C 10 aralkyl, C 1 -C 10 heteroalkyl, or C 1 -C 10 heteroaryl, and at least one of R 3 , R 4 , R 5 , R 6 , and R 7 is not hydrogen; (2) zwitterionic amine complexes; and (3) combinations of two or more thereof, to produce a phosphitylated compound. Further provided are methods for purifying phosphitylated compounds comprising the steps of providing a phosphitylated compound in a solution solvent, contacting said phosphitylated compound with a precipitation solvent, and precipitating said phosphitylated compound.
Abstract:
Provided are methods of producing phosphitylated compounds, including 3'- O~phosphoramidites, comprising the step of reacting a hydroxyl-containing compound with a phosphitylating agent in the presence of a phosphitylation activator selected from the group consisting of (1) acid-base complexes derived from an amine base of Formula (I) wherein R, R1, and R2 are independently C1-C10 alkyl, C1-C10 cycloalkyl, C1-Cl0 aryl, Cl-C10 aralkyl, Cl- C10 heteroalkyl, or Cl-CIO heteroaryl; (2) acid-base complexes derived from an amine base of Formula (II) wherein R3, R4, R5, R6, and are independently hydrogen, C1-C10 alkyl, Cl-C10 cycloalkyl, Cl-C10 aryl, Cl-CIO aralkyl, Cl-C IO heteroalkyl, or C1-C10 heteroaryl, and at least one of R3, R4, R5, R6, and R 7 is not hydrogen.; (3) acid-base complexes derived from a diazabicyclo amine base; (4) zwitterionic amine complexes; and (5) combinations of two or more thereof, to produce a phosphitylated compound.
Abstract:
Un método para la preparación de SnO que comprende: (a) hacer reaccionar una sal de estaño con un ácido dicarboxílico C2-12 en fase acuosa para formar una suspensión que comprende un complejo de dicarboxilato de estaño; (b) lavar el complejo de dicarboxilato de estaño con agua para obtener una disolución de lavado y un complejo de dicarboxilato de estaño lavado en donde una concentración del anión de la sal de estaño en el complejo de dicarboxilato de estaño lavado es menor que un 1 % en peso, en donde el lavado del complejo de dicarboxilato de estaño continúa hasta que la disolución de lavado presenta un pH neutro y (c) hacer reaccionar el complejo de dicarboxilato de estaño lavado con una base para formar SnO, en donde el SnO presenta un recuento de radiación alfa menor que 0.002 cph/cm2 y en donde el SnO presenta una pureza de al menos un 99 % en peso, excluyendo cualquier SnO2 presente.
Abstract:
A method for the formation of 3-alkylthiophenes or 3-arylthiophenes from 3-halothiophenes. More particularly, improvements on the Kumada coupling reaction for the production of 3-alkylthiophenes or 3-arylthiophenes by reacting a 3-halothiophene with an alkylmagnesiumhalide or arylmagnesiumhalide Grignard reagent in the presence of a catalyst and a 2-methyl tetrahydrofuran solvent. The 2-methyl tetrahydrofuran solvent allows for higher concentrations of the Grignard reagent with minimal or no dithienyl side product generation, achieving higher product yields and at a lower cost than other known methods.