申请人:Lemaire Marc
公开号:US20130131379A1
公开(公告)日:2013-05-23
The present invention relates to a method for preparing carboxylic acids, in particular mono- and dicarboxylic acids, by oxidative cleavage of a vicinal diol.
According to the invention, said method consists of reacting a vicinal diol of formula I:
where:
p is an integer comprised between 1 and 6;
R1 and R2 are, separately:
an alkyl or hydroxyl group having 1 to 12 carbon atoms;
a —(CH
2
)
n
—C0
2
M group where n, which can be identical or different in R1 and R2, is an integer comprised between 1 and 11 and M is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms or an alkaline cation;
or R1 and R2 jointly form an alkylene —(CH
2
)m- group where m is an integer comprised between 2 and 10, preferably between 2 and 6;
with industrial-grade sodium hypochlorite (or bleach), in the absence of an organic solvent and without adding a catalyst, preferably at room temperature. The invention can be used for recycling natural vegetable oils.
本发明涉及一种制备羧酸的方法,特别是通过对邻二醇进行氧化裂解制备单羧酸和二羧酸。
根据本发明,所述方法包括将式I的邻二醇进行反应:
其中:
p是介于1和6之间的整数;
R1和R2分别是:
具有1至12个碳原子的烷基或羟基基团;
一个—(CH
2
)
n
—C0
2
M基团,其中n在R1和R2中可以相同也可以不同,是介于1和11之间的整数,M是氢原子或具有1至4个碳原子的烷基基团或碱性阳离子;
或者R1和R2共同形成一个亚烷基—(CH
2
)m-基团,其中m是介于2和10之间的整数,优选在2和6之间;
使用工业级次氯酸钠(或漂白剂),在无机溶剂的情况下且不添加催化剂的情况下,最好在室温下进行。该发明可用于回收天然植物油。