One‐pot Synthesis of 1,3‐Butadiene and 1,6‐Hexanediol Derivatives from Cyclopentadiene (CPD) via Tandem Olefin Metathesis Reactions
作者:Gábor Turczel、Ervin Kovács、Eszter Csizmadia、Tibor Nagy、Imre Tóth、Robert Tuba
DOI:10.1002/cctc.201801088
日期:2018.11.7
A novel tandem reaction of cyclopentadiene leading to high value linear chemicals via ruthenium catalyzed ring opening cross metathesis (ROCM), followed by cross metathesis (CM) is reported. The ROCM of cyclopentadiene (CPD) with ethylene using commercially available 2nd gen. Grubbs metathesis catalysts (1‐G2) gives 1,3‐butadiene (BD) and 1,4‐pentadiene (2) (and 1,4‐cyclohexadiene (3)) with reasonable
报道了一种新的环戊二烯串联反应,该反应通过钌催化的开环交叉复分解(ROCM),然后进行交叉复分解(CM),产生了高价值的线性化学品。环戊二烯(CPD)与乙烯的ROCM使用可商购的第二代产品。Grubbs复分解催化剂(1-G2)产生1,3-丁二烯(BD)和1,4-戊二烯(2)(和1,4-环己二烯(3)),且产率合理(高达24%(BD)和67甲苯溶液中1–5 mol%的催化剂负载量(5 V%CPD,在73%CPD转化率下为%(2 + 3)),10 bar,RT)在平衡反应中。CPD与顺丁烯二醇二乙酸酯(4)的ROCM含量为1.00 ‐ 0.05 mol%的第三代。Grubbs(1-G3)或第二代 Hoveyda-Grubbs(1-HG 2)催化剂的负载量得到六乙酸2,4-二烯-1,6-二乙酸二乙酯(5),它是1,6-己二醇(聚氨酯,聚酯和多元醇合成的中间体)的前体以及高收率的二庚基2,5-二烯-1