Siloxacycles are efficiently prepared from compounds of the formula
R
1
—C(═O)—[O—CH
2
—Si(R
2
)
2
]
n
—OR
3
(II)
by reaction in the presence of an alcohol and an acidic catalyst selected from organic resins with sulfo groups, acidic alumina, clay minerals, montmorillonites, acidic zeolites, iso- and heteropolyacids. The products can be produced in high yield and purity and are suitable for effectively end capping organopolysiloxanes.
Siloxacycles可以从式R1—C(═O)—[O—
CH2—Si(R2)2]n—OR3(II)的化合物在醇和有机
树脂、酸性氧化铝、粘土矿物、
蒙脱石、酸性
沸石、异或多酸酸性催化剂的存在下高效制备。产物可以高产率、高纯度地制备,并适用于有效地端基修饰有机聚
硅氧烷。