Abstract: Disclosed is a method for mass-producing 4?-ethynyl d4T (4?-ethynyl-2?,3?-didehydro-3?-deoxythymidine) by a simpler process at low cost. Specifically disclosed is a method for producing 4?-ethynyl d4T, which is characterized by comprising a step for introducing a triple bond-containing group into a furfuryl alcohol derivative or a levoglucosenone, by reacting the furfuryl alcohol derivative or levoglucosenone with a certain compound, and a step for reacting a compound represented by the formula (III), which is obtained by the aforementioned step, with thymine.

Abstract: In one aspect, the invention relates to methods of synthesizing acryloyl compounds, comprising the step of hydrosilylating a compound having the structure: with a compound having the structure A-H, wherein A comprises a siloxanyl group, to yield a compound having the structure: Compounds and compositions produced thereby can effectively attain a satisfactory balance between high oxygen permeability and hydrophilicity while achieving an acceptably low concentration of undesirable impurities. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: There is provided a process for producing a concentrated solution of quaternary ammonium hydroxide which is characterized in that quaternary ammonium hydroxide in a form of water-containing crystals or of an aqueous solution is mixed with a water-soluble organic solvent selected from the group consisting of glycol ether, glycol and triol and the resulting mixed solution is subjected to a thin-film distillation in vacuo so as to evaporate the low boiling material. In accordance with this process, a concentrated solution of quaternary ammonium hydroxide having low water content is able to be easily produced.

Abstract: There is provided a process for producing a concentrated solution of quaternary ammonium hydroxide which is characterized in that quaternary ammonium hydroxide in a form of water-containing crystals or of an aqueous solution is mixed with a water-soluble organic solvent selected from the group consisting of glycol ether, glycol and triol and the resulting mixed solution is subjected to a thin-film distillation in vacuo so as to evaporate the low boiling material. In accordance with this process, a concentrated solution of quaternary ammonium hydroxide having low water content is able to be easily produced.

Abstract: Disclosed is a method for mass-producing 4?-ethynyl d4T (4?-ethynyl-2?,3?-didehydro-3?-deoxythymidine) by a simpler process at low cost. Specifically disclosed is a method for producing 4?-ethynyl d4T, which is characterized by comprising a step for introducing a triple bond-containing group into a furfuryl alcohol derivative or a levoglucosenone, by reacting the furfuryl alcohol derivative or levoglucosenone with a certain compound, and a step for reacting a compound represented by the formula (III), which is obtained by the aforementioned step, with thymine.

Abstract: The present invention provides a novel intermediate for synthesizing vitamin D derivatives by using a less expensive material. That is, the present invention provides a compound which is synthesized by using carvone as a starting material and which is represented by the following formulae.

Abstract: Disclosed are reduced pressure distillation methods for purifying siloxanyl monomers in the presence of at least one polymerization inhibitor. In further aspects, the polymerization inhibitor can be an alkylhydroquinone or a hydroxynaphthalene. Also disclosed are compounds purified by the disclosed methods and polymers produced therefrom. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: In one aspect, the invention relates to methods of synthesizing acryloyl compounds, comprising the step of hydrosilylating a compound having the structure: with a compound having the structure A-H, wherein A comprises a siloxanyl group, to yield a compound having the structure: Compounds and compositions produced thereby can effectively attain a satisfactory balance between high oxygen permeability and hydrophilicity while achieving an acceptably low concentration of undesirable impurities. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: The present invention provides a novel intermediate for synthesizing vitamin D derivatives by using a less expensive material. That is, the present invention provides a compound which is synthesized by using carvone as a starting material and which is represented by the following formulae.