《Silver nanoparticles-decorated Preyssler functionalized cellulose biocomposite as a novel and efficient catalyst for the synthesis of 2-amino-4H-pyrans and spirochromenes》 was published in Scientific Reports in 2020. These research results belong to Saneinezhad, Sara; Mohammadi, Leila; Zadsirjan, Vahideh; Bamoharram, Fatemeh F.; Heravi, Majid M.. Category: ethers-buliding-blocks The article mentions the following:
Silver nanoparticles-decorated Preyssler functionalized cellulose biocomposite (PC/AgNPs) was prepared and fully characterized by FTIR, UV-vis, SEM, and TEM techniques. The preparation of PC/AgNPs was studied systematically to optimize the processing parameters by Taguchi method using the amount of PC, reaction temperature, concentration of silver nitrate and pH of medium. Taguchi’s L9 orthogonal (4 parameters, 4 level) was used for the exptl. design. The SEM anal. confirmed the presence of the Preyssler as a white cloud as well as spherical AgNPs on the surface of cellulose. The formation of AgNPs on the surface was observed by changing of the color from yellow to deep brown and confirmed by UV-vis spectroscopy. The best yield of AgNPs forming was obtained in pH 12.5 at 80°C in 20 min. TEM anal. confirmed the formation of spherical AgNPs with a size of 50 nm, at the 1% weight loading of Preyssler. This easily prepared PC/AgNPs was successfully employed as an efficient, green, and reusable catalyst in the synthesis of a wide range of 2-amino-4H-pyran I (R = Ph, 3-nitrophenyl, 4-chlorophenyl, etc.; X = CN, CO2Et), II (R1 = Ph, 2-methoxyphenyl, 4-chlorophenyl, etc.), III (R2 = Ph, 4-hydroxyphenyl, 4-chlorophenyl, etc.), IV (R3 = Ph, 2-nitrophenyl, 3-bromophenyl, etc.) and V and functionalized spirochromene derivatives via a one-pot, multicomponent reaction. The chief merits realized for this protocol were the utilization of com. available or easily accessible starting materials, operational simplicity, facile work-up procedure, obtaining of high to excellent yields of the products and being done under green conditions. The catalyst could be easily separated from the reaction mixture and reused several times without observing any appreciable loss in its efficiency. In the experiment, the researchers used many compounds, for example, 2-Methoxybenzaldehyde(cas: 135-02-4Category: ethers-buliding-blocks)
2-Methoxybenzaldehyde(cas: 135-02-4) is used as a flavor agent in foods including nonalcoholic/alcoholic beverages, baked goods, chewing gum, confections, frozen dairy, fruit ices, hard/soft candy, instant coffee, tea, Jams, jellies, and milk products. It also has been used to obtain good enantioselectivities using Cu(OAc)(2)-bis(oxazolines) via hydrogen bonding in asymmetric Henry reaction.Category: ethers-buliding-blocks
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