Oxidation reactions of some natural volatile aromatic compounds: anethole and eugenol
摘要:
trans-Anethole [1-methoxy-4-(trans-prop-1-en-1-yl)benzene] was isolated from anise seed oil (Pimpinella anisum). Its photochemical oxidation with hydrogen peroxide gave the corresponding epoxy derivative together with 4-methoxybenzaldehyde. The thermal oxidation of trans-anethole with 3-chloroperoxybenzoic acid at room temperature resulted in the formation of dimeric epoxide, 2,5-bis(4-methoxyphenyl)-3,6-dimethyl-1,4-dioxane, as the only product. Photochemical oxygenation of trans-anethole in the presence of tetraphenylporphyrin, Rose Bengal, or chlorophyll as sensitizer led to a mixture of 1-(4-methoxyphenyl)prop-2-en-1-yl hydroperoxide and 4-methoxybenzaldehyde. Eugenol was isolated from clove oil [Eugenia caryophyllus (Spreng.)]. It was converted into 2-methoxy-4-(prop-2-en-1-yl)phenyl hydroperoxide by oxidation with hydrogen peroxide under irradiation. Thermal oxidation of eugenol with 3-chloroperoxypenzoic acid at room temperature produced 2-methoxy-4-(oxiran-2-ylmethyl)phenol, while sensitized photochemical oxygenation (in the presence of Rose Bengal or chlorophyll) gave 4-hydroperoxy-2-methoxy-4-(prop-2-en-1-yl)cyclohexa-2,5-dien-1-one.
Smoking articles containing polymers of polycarboxylic acid esters
申请人:Philip Morris USA Inc.
公开号:US10039310B2
公开(公告)日:2018-08-07
Disclosed is a smoking article containing a rod containing a smokable composition, an optional wrapper for the rod, and at least one polymer or oligomer comprising monomer units of a polycarboxylic acid ester disposed on or in the rod, the wrapper, or both. The polycarboxylic acid ester contains an acid moiety having at least two carboxylic groups, and at least two alcohol moieties independently selected from those corresponding to a cycloalkyl alcohol or an aryl alcohol. The cycloalkyl alcohol or aryl alcohol is a flavorant, or chemesthetic agent, or both. In addition, a method for the controlled release of these flavorant or chemesthetic agents is described, which comprises pyrolyzing at least one polymer or oligomer.
POLYSILOXANE COPOLYMERS,THERMOPLASTIC COMPOSITION, AND ARTICLES FORMED THEREFROM
申请人:Sabic Innovative Plastics IP B.V.
公开号:EP2049583A1
公开(公告)日:2009-04-22
Siloxane bishchloroformates
申请人:Silva Manio James
公开号:US20070093629A1
公开(公告)日:2007-04-26
A continuous method for the preparation of bischloroformates of siloxane bisphenols, said method comprising introducing into a flow reactor and contacting therein at least one siloxane bisphenol, at least one metal hydroxide, at least one metal salt, at least one solvent and phosgene to form a flowing reaction mixture having an organic phase and an aqueous phase and forming bischloroformates of siloxane bisphenols in the flowing reaction mixture.
POLYSILOXANE COPOLYMERS, THERMOPLASTIC COMPOSITION, AND ARTICLES FORMED THEREFROM
申请人:Colborn Edgar Robert
公开号:US20070129492A1
公开(公告)日:2007-06-07
A polysiloxane copolymer composition comprises: a polysiloxane unit comprising 4 to 50 siloxane units, and a polyester-polycarbonate unit consisting of 50 to 100 mole percent of arylate ester units, less than 50 mole percent aromatic carbonate units, less than 30 mole percent resorcinol carbonate units, and less than 35 mole percent bisphenol carbonate units, wherein the siloxane units are present in the polysiloxane unit in an amount of 0.2 to 10 wt % of the total weight of the polysiloxane copolymer composition, and wherein the polysiloxane copolymer composition has a 2 minute integrated heat release rate of less than or equal to 65 kilowatt-minutes per square meter (kW-min/m
2
) and a peak heat release rate of less than 65 kilowatts per square meter (kW/m
2
) as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d). A window article for an aircraft, comprising the polysiloxane copolymer composition, is also disclosed.