Advancing H-Bonding Organocatalysis for Ring-Opening Polymerization: Intramolecular Activation of Initiator/Chain End.

Organocatalytic ring-opening polymerization (ROP) of lactones is a green method for accessing renewable and biodegradable polyesters. Developing new organocatalysts with high activity and controllability is a major and challenging research topic in this field. Here, we report a series of organocatalysts to achieve a fast and controlled ROP of lactones.

Cobalt-Catalyzed Regiodivergent Double Hydrosilylation of Arylacetylenes.

Double hydrosilylation of alkynes represents a straightforward method to synthesize bis(silane)s, yet it is challenging if α-substituted vinylsilanes act as the intermediates. Here, a cobalt-catalyzed regiodivergent double hydrosilylation of arylacetylenes is reported for the first time involving this challenge, accessing both vicinal and geminal bis(silane)s with exclusive regioselectivity. Various novel bis(silane)s containing Si-H bonds can be easily obtained.

Aliphatic Polyesters with White-Light Clusteroluminescence.

Single-molecule white-light emission (SMWLE) has many advantages in practical applications; however, the fabrication of SMWLE from nonconjugated luminescent polymers, namely, clusteroluminogens (CLgens), is still a big challenge. Herein, the first example of linear nonconjugated polyesters with SMWLE is reported. Twenty-four kinds of nonconjugated aliphatic polyesters with tunable clusteroluminescence (CL) colors and efficiency were synthesized by the copolymerization of six epoxides and four anhydrides.

Determination of D,L-serine in midbrain of Parkinson's disease mouse by capillary electrophoresis with in-column light-emitting diode induced fluorescence detection.

A capillary electrophoresis method with in-column light-emitting diode induced fluorescence detection is described for simultaneous determination of D,L-serine in the midbrain of a Parkinson's disease mouse. D,L-Serine was derivatized with fluorescein isothiocyanate, and chiral separation and determination of D,L-serine derivatives were performed on a laboratory-built capillary electrophoresis system with in-column light-emitting diode induced fluorescence detector using gamma-cyclodextrin as chiral selector. Using this method, the levels of D- and L-serine in the midbrains of Parkinson's disease mice were determined.

Determination of octopamine in human plasma by capillary electrophoresis with optical fiber light-emitting diode-induced fluorescence detection.

A new analytical method based on capillary electrophoresis (CE) separation and optical fiber light-emitting diode (LED)-induced fluorescence detection has been developed for the determination of octopamine. Naphthalene-2,3-dicarboxaldehyde (NDA) was used for precolumn derivatization of octopamine. The separation and determination of the derivative was performed using a laboratory-built CE system with an optical fiber LED-induced fluorescence detector.