申请人:Montedison S.p.A.
公开号:US04317905A1
公开(公告)日:1982-03-02
A process is disclosed for preparing aliphatic compounds containing two conjugated double bonds cis-cis or cis-trans, characterized in that a compound of the general formula ##STR1## (in which R is H, alkyl from C.sub.1 to C.sub.10, or OY in which Y is a protective group selected from the class consisting of tetrahydropyranyl and 1-ethoxyethyl; X is an ester function selected from the class consisting of the acetates) is reacted with an alkyl-magnesium halide of the general formula: Z--Mg--R.sup.1 (II) (in which Z is chlorine, bromine or iodine, and R.sup.1 is a C.sub.1 -C.sub.10 alkyl group, or a group (CH.sub.2).sub.n OY in which Y has the same meaning as in formula (I), and n is a number from 3 to 10) in the presence of Li.sub.2 CuCl.sub.4, CuCl, CuBr, or CuI at temperatures ranging from about -30.degree. to +10.degree. C. in the presence of ethyl ether or tetrahydrofuran as solvent, to obtain an aliphatic compound of the general formula: R--CH.sub.2 --C.tbd.C--CH.dbd.CH--CH.sub.2 R.sup.1 (III) in which the carbon atoms linked with the double bond carry two hydrogen atoms in cis position, and reducing the triple bond of (III) with lithium-aluminum hydride to produce the trans-cis compound, or reducing (III) with dialkylborane or catecholborane to produce the cis-cis compound.
本发明公开了一种制备含有两个共轭双键的顺式-顺式或顺式-反式脂肪化合物的方法,其特征在于将一般式为##STR1##(其中R为H,C.sub.1至C.sub.10的烷基或OY,其中Y是从四氢吡喃基和1-乙氧基乙基保护基类中选择的保护基;X是从醋酸盐类中选择的酯基)的化合物与一般式为Z--Mg--R.sup.1(II)(其中Z为氯、溴或碘,R.sup.1为C.sub.1-C.sub.10烷基或(CH.sub.2).sub.n OY基团,其中Y的含义与公式(I)中相同,n为3至10的数字)在Li.sub.2 CuCl.sub.4、CuCl、CuBr或CuI存在下,在乙醚或四氢呋喃溶剂存在下,温度在约-30℃至+10℃范围内反应,以获得一般式为R-CH.sub.2-C.tbd.C-CH.dbd.CH-CH.sub.2R.sup.1(III)的脂肪化合物,其中与双键连接的碳原子在顺式位置携带两个氢原子,并使用氢化铝锂还原(III)的三键以产生反式-顺式化合物,或使用二烷基硼烷或邻苯二酚硼烷还原(III)以产生顺式-顺式化合物。