Ferric sulfate is a simple and commercially available solid catalyst and demonstrated to be able to catalyze terpenic alcohols esterification with acetic acid, achieving high conversion and ester selectivity. This process is an attractive option to the enzymatic or acid homogenous processes commonly used to synthesize esters. The undesirable steps of neutralizing of the products are avoided. A study of the activity of hydrated Fe₂(SO₄)₃ demonstrated that although the efficiency of the catalyst is directly linked to the ability of the Fe^III cations to generate H₃O⁺ ions, the solid catalyst plays also a key role on the esterification process. We assessed the effects of the main reaction variables such as reactants proportion, temperature, and catalyst concentration. Different terpenic alcohols such as β‐citronellol, geraniol, nerol, linalool, α‐terpineol and borneol were esterified in the presence of Fe₂(SO₄)₃ catalyst. The Fe₂(SO₄)₃ catalyst was easily recovered and reused.

中文翻译：

---

Fe（SO4）3催化的三元醇酯的合成：一种简单且可双功能重复使用的固体催化剂

硫酸铁是一种简单且可商购的固体催化剂，并被证明能够催化萜烯醇与乙酸的酯化反应，从而实现高转化率和酯选择性。对于通常用于合成酯的酶促或酸均质过程而言，该方法是有吸引力的选择。避免了中和产物的不希望的步骤。对水合Fe ₂（SO ₄）₃的活性的研究表明，尽管催化剂的效率与Fe ^III阳离子产生H ₃ O ⁺的能力直接相关。离子，固体催化剂在酯化过程中也起着关键作用。我们评估了主要反应变量的影响，例如反应物比例，温度和催化剂浓度。在Fe ₂（SO ₄）₃催化剂存在下，将不同的萜烯醇（如β-香茅醇，香叶醇，神经醇，芳樟醇，α-松油醇和冰片）酯化。Fe ₂（SO ₄）₃催化剂易于回收和再利用。