The present invention relates to a for controlled synthesis of hydrogen-rich cyclosiloxanes of the (H2SiO)n type.
where n is an integer equal to or greater than 3, by reacting:
a.) a halosilane of the H2SiX2 type where X=halogen with
b.) a lithium salt, copper(II) salt or a salt of a metal from main group 2 or transition group 2 of the periodic table of the elements, or a mixture of these salts.
The ring size is advantageously adjustable to n=3, 4, 5, 6 (especially n=4 to 6), such that larger rings are not formed.
In a particularly advantageous embodiment of the process, for the selective preparation of cyclohexasiloxane (H2SiO)6, after the reaction, the solvent is at least partly removed and then solvent is added again.
本发明涉及一种控制合成(H2SiO)n型氢富环
硅氧烷的方法。
其中n是大于或等于3的整数,通过以下反应实现:
a.) H2SiX2型卤代
硅烷与
b.)
锂盐、
铜(II)盐或元素周期表主2族或过渡2族
金属的盐,或这些盐的混合物。
环大小可有利地调整为n=3, 4, 5, 6(特别是n=4至6),以避免形成更大的环。在该过程的一个特别有利的实施方式中,用于选择性制备环六
硅氧烷(H2SiO)6,在反应后,至少部分去除溶剂,然后再次加入溶剂。