The usefulness of solar light for carrying out photocatalytic reactions involving the formation of a carbonâcarbon bond has been explored. Thus, some radical alkylations of α,β-unsaturated acids or aldehydes have been carried out in a mixed aqueous solution. Under these conditions, alkyl radicals are generated from i-PrOH and 1,3-dioxolane by photocatalyzed hydrogen abstraction. A water soluble photocatalyst (disodium benzophenondisulfonate, BPSS) was used, which greatly simplifies work up. With reasonably efficient radical traps (e.g. maleic acid), the syntheses could be carried out up to completion on a 10 gram scale within 10â15 hours exposure to sunlight in a solar concentrator (SOLFIN apparatus) in November in Almeria (Spain). The alkylation of some α,β-unsaturated aldehydes have been likewise performed under the same conditions.
人们已经探索了太阳光在进行涉及碳-碳键形成的光催化反应中的有用性。因此,一些α,β-不饱和酸或醛的自由基烷基化是在混合
水溶液中进行的。在这些条件下,i-PrOH 和
1,3-二氧戊环通过光催化夺氢生成烷基自由基。使用
水溶性光催化剂(
二苯甲酮二
磺酸二
钠,BPSS),大大简化了操作。借助相当有效的自由基捕获器(例如
马来酸),11 月在阿尔梅里亚(西班牙)的太阳能聚光器(SOLFIN 装置)中,在阳光照射下 10-15 小时内即可完成 10 克规模的合成。一些α,β-不饱和醛的烷基化也在相同的条件下进行。