3‐Silylpropanols bearing allyl or aryl groups on the silicon atom were found to act as isocyanate blocking agents that can allow to deblock with efficient inhibition of re‐blocking. As a result of the inhibition, the isocyanates blocked by 3‐silylpropanols showed an exceptional lower deblocking temperature than by a conventional aliphatic alcohol. The inhibition is based upon the decomposition reaction of 3‐silylpropanols to a 5‐membered cyclic silane and propylene or arene, where β‐silyl cation intermediates may play a key role. The new blocked isocyanates can tolerate water, whereas previously well‐known low‐temperature‐deblockable agents, such as methylethyl ketone oxime (MEKO), are not generally compatible with water.

中文翻译：

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在封端的异氰酸酯解封过程中有效抑制重封阻

发现在硅原子上带有烯丙基或芳基的3-甲硅丙醇可作为异氰酸酯封端剂，使其能够脱封并有效抑制再封端。由于抑制作用，被3-甲硅烷基丙醇封端的异氰酸酯显示出比常规脂族醇低的解封温度。抑制作用是基于3-甲硅烷基丙醇与五元环硅烷和丙烯或芳烃的分解反应，其中β-甲硅烷基阳离子中间体可能起关键作用。新的封端异氰酸酯可以耐受水，而以前广为人知的低温可封端剂（例如甲乙酮肟（MEKO））通常与水不相容。