The rapid-response ratiometric sensors are promising materials to detect trace water and temperature. However, the accurately visualized water assay in very narrow-range still remains a challenge. Herein, a novel dual-functional...

The precise synthesis of chiral poly­(silyl ether)­s remains a challenge, in contrast to the well-studied preparation of poly­(silyl ether)­s. Herein, an unprecedented approach for the synthesis of optically active poly­(silyl ether)­s with main-chain chirality has been developed via CuH-catalyzed hydrosilylation polymerization of diketones and silanes. The polymerization features low catalyst loading, mild condition, and broad substrate scope, including a wide range of aromatic diketones and heteroaromatic diketones with excellent yields and enantioselectivities (up to 98% yield and 99% ee). Thermal analysis indicated chiral poly­(silyl ether)­s exhibit good thermal properties. These enantiomerically enriched poly­(silyl ether)­s with good thermal stability have a promising application in chiral separation.

Owing to the dehydrogenative rearomatization of hydrogenation product and poisoning effect of nitrogen atom, asymmetric hydrogenation of polycyclic nitrogen‐containing heteroaromatics is still a great challenge. Herein, through in situ protection of hydrogenation products with acetic anhydride to inhibit rearomatization and poisoning effect, a novel iridium‐catalyzed enantioselective hydrogenation of polycyclic nitrogen‐containing heteroaromatics – pyrrolo/indolo[1,2‐a]quinoxalines and phenanthridines – has been successfully developed, providing a facile access to chiral dihydropyrrolo/indolo[1,2‐a]quinoxalines and dihydrophenanthridines with up to 98% ee. The strategy features broad substrate scope, easy operation and potential medicinal application.magnified image