Synthesis and Ultraviolet Absorption Characteristics of 4-Arylidene Isopinocamphones from a-Pinene
作者:Jia-Yu Wang、Peng-Na Wang、Jin-Lai Yang、Jia Shen、Xu Xu、Shi-Fa Wang
DOI:10.14233/ajchem.2014.17781
日期:——
A new series of 4-arylidene isopinocamphones were synthesized from a-pinene which is a natural chemical from pine tree and their ultraviolet absorption characteristics were investigated. (+)Isopinocamphone was obtained from a-pinene by hydroboration-oxidation and then it was reacted with benzaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde, p-chlorobenzaldehyde, furfural and p-nitrobenzaldehyde in the presence of alkali catalysts to get 4-arylidene isopinocamphones including 2-benzylidene-4,6,6-trimethylbicyclo[3.1.1]heptan-3-one (1), 2,6,6-trimethyl-4-(4-methyl benzyl)bicyclo[3.1.1]heptane-3-one (2), 2-(4-methoxybenzylidene)-4,6,6-trimethylbicyclo[3.1.1]heptan-3-one (3), 2-(4-chlorobenzylidene)-4,6,6-trimethylbicyclo[3.1.1]heptan-3-one (4), 2-(furan-2-methylene)-4,6,6-trimethylbicyclic [3.1.1] heptane-3-one (5) and 2,6,6-trimethyl-4-(4-nitrobenzylidene)bicyclo[3.1.1]heptan-3-one (6). The structures of 4-arylidene isopinocamphones were determined by FT-IR, 1H NMR, 13C NMR and GC-MS technique. Their ultraviolet absorption characteristics and light stability was further examined. The results showed that compounds 1, 2, 3 and 5 could be used as B-type UV absorbents, compounds 4 and 6 could be used as A-type UV absorbents and compounds 6 had both functions as UV-A and UV-B types absorbents. The light stability sequence of these compounds was (2) > (1) » (3) » (4) » (6) > (5).
研究人员从松树的天然化学物质蒎烯中合成了一系列新的 4-芳基异松蒎烯,并研究了它们的紫外线吸收特性。(+)异松蒎烯通过氢硼化合-氧化反应得到(+)异松蒎烯,然后在碱催化剂存在下与苯甲醛、对甲基苯甲醛、对甲氧基苯甲醛、对氯苯甲醛、糠醛和对硝基苯甲醛反应得到 4-芳基异松蒎烯,包括 2-亚苄基-4,6,6-三甲基双环[3.1.1]庚烷-3-酮 (1)、2,6,6-三甲基-4-(4-甲基苄基)双环[3.1.1]庚烷-3-酮 (2)、2-(4-甲氧基亚苄基)-4,6,6-三甲基双环[3.1.1]庚烷-3-酮 (3)、2-(4-氯亚苄基)-4,6,6-三甲基双环[3.1.1]庚烷-3-酮 (4)、2-(呋喃-2-亚甲基)-4,6,6-三甲基双环[3.1.1]庚烷-3-酮 (5) 和 2,6,6-三甲基-4-(4-硝基亚苄基)双环[3.1.1]庚烷-3-酮 (6)。通过傅立叶变换红外光谱(FT-IR)、1H NMR、13C NMR 和气相色谱-质谱(GC-MS)技术确定了 4-芳基亚甲基异频酰胺酮的结构。还进一步研究了它们的紫外吸收特性和光稳定性。结果表明,化合物 1、2、3 和 5 可用作 B 型紫外线吸收剂,化合物 4 和 6 可用作 A 型紫外线吸收剂,化合物 6 同时具有 UV-A 型和 UV-B 型吸收剂的功能。这些化合物的光稳定性顺序为 (2) > (1) " (3) " (4) " (6) > (5)。