- NOVEL 1,2-DIPHENYLETHYLENE GLYCOL COMPOUNDS FOR COMBATING AGING OF THE SKIN, AND COSMETIC USE THEREOF
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The present invention relates to novel compounds of formula (I) to cosmetic compositions comprising same, and also to the use thereof for preventing and/or cosmetically treating the signs of aging of the skin.
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- Renewable thermosetting resins and thermoplastics from vanillin
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Two cyanate ester resins and a polycarbonate thermoplastic have been synthesized from vanillin. The bisphenol precursors were prepared by both an electrochemical route as well as by a McMurry coupling reaction. 1,2-Bis(4-cyanato-3-methoxyphenyl)ethene (6) had a high melting point of 237 °C and did not cure completely under a standard cure protocol. In contrast, the reduced version, 1,2-bis(4-cyanato-3-methoxyphenyl)ethane (7) melted at 190 °C and underwent complete cure to form a thermoset material with Tg = 202 °C. 7 showed thermal stability up to 335 °C and decomposed via formation of phenolics and isocyanic acid. A polycarbonate was then synthesized from the reduced bisphenol by a transesterification reaction with diphenylcarbonate. The polymer had Mn = 3588, Mw/Mn = 1.9, and a Tg of 86 °C. TGA/FTIR data suggested that the polycarbonate decomposed via formation of benzodioxolones with concomitant elimination of methane. The results show that vanillin is a useful precursor to both thermosetting resins and thermoplastics without significant modification. This journal is
- Harvey, Benjamin G.,Guenthner, Andrew J.,Meylemans, Heather A.,Haines, Shannon R. L.,Lamison, Kevin R.,Groshens, Thomas J.,Cambrea, Lee R.,Davis, Matthew C.,Lai, William W.
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p. 1249 - 1258
(2015/03/04)
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- Vanillin based polymers: I. An electrochemical route to polyvanillin
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Electrochemical reductive polymerization of divanillin in aqueous sodium hydroxide using a lead cathode gives polyvanillin in 91% yield. The product was characterized by elemental analysis, UV-Vis, FT-IR, 1H, 13C NMR, TGA-DTGA, and GPC.
- Amarasekara, Ananda S.,Wiredu, Bernard,Razzaq, Ashfaqur
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supporting information
p. 2395 - 2397
(2013/02/22)
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- A convenient synthesis of unsymmetrical pinacols by coupling of structurally similar aromatic aldehydes mediated by low-valent titanium
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The one-pot, selective cross pinacol-type couplings between two structurally similar aromatic aldehydes promoted by low-valent titanium generated unsymmetrical pinacols in moderate to good isolated yields in an erythrolthreo ratio of up to 91:9. This synt
- Duan, Xin-Fang,Feng, Jian-Xia,Zi, Guo-Fu,Zhang, Zhan-Bin
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experimental part
p. 277 - 282
(2009/06/24)
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- Pinacol coupling of aromatic aldehydes and ketones using magnesium in aqueous ammonium chloride under ultrasound
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The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8-95% yield with magnesium in 0.1 M aqueous NH4C1 under ultrasound irradiation at r.t. for 3 h.
- Li, Ji-Tai,Bian, Yan-Jiang,Zang, Hong-Jun,Li, Tong-Shuang
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p. 547 - 551
(2007/10/03)
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