Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine

A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supported sulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu3 residue can be recovered as Bu3SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine 7 was achieved by using the P4a-mediated allylation of Boc-l-phenylglycinal as a key step

Efficient Allylation of Aldehydes Promoted by Carboxylic Acids

A variety of carboxylic acids have been screened for mediating the allylation of aldehydes with allytributyltin in different solvents. A novel, general, and practical method of allylation of aldehydes promoted by carboxylic acids under mild reaction conditions has been developed. Among them, p-nitrobenzoic acid afforded high to quantitative yields of the homoallylic alcohol products, and can be easily recovered after workup by aqueous HCl. Glyoxylic acid self-catalyzed the allylation without adding any other promoter or catalyst to give the corresponding allylation product in good yield. The regioselectivity of the crotylation of aldehydes is tunable by controlling the acidity of the carboxylic acids. The crotylation of aldehydes produced the α-adduct as major products in moderate to good yields with CF3CO2H as a promoter. A possible mechanism for the allylation is also discussed

Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine

A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supported sulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu3 residue can be recovered as Bu3SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine 7 was achieved by using the P4a-mediated allylation of Boc-l-phenylglycinal as a key step

Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine

A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supported sulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu3 residue can be recovered as Bu3SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine 7 was achieved by using the P4a-mediated allylation of Boc-l-phenylglycinal as a key step

Bicyclization of Enynes Using the Cp₂TiCl₂−Mg−BTC System: A Practical Method to Bicyclic Cyclopentenones

Bicyclic titanacycles 2 generated with the Cp2TiCl2−Mg−P(OEt)3 system can be trapped with bis(trichloromethyl) carbonate (BTC) to give bicyclic cyclopentenones 3 in good yields. The titanacycle 2m was isolated and well-identified. Bicyclization of enynes containing 1,2-disubstituted olefin by this method gave good results with excellent stereoselectivity

data for "Mismeasurement of the core-shell structure of black carbon-containing ambient aerosols by SP2 measurements"

The data for "Mismeasurement of the core-shell structure of black carbon-containing ambient aerosols by SP2 measurements"</p

Asymmetric Intramolecular Oxa-Michael Reactions to Tetrahydrofurans/2<i>H</i>‑Pyrans Catalyzed by Primary–Secondary Diamines

The asymmetric intramolecular oxa-Michael reactions of α,β-unsaturated ketones have been achieved by using readily accessible primary–secondary diamines as the organocatalysts, giving the synthetically useful tetrahydrofurans/2<i>H</i>-pyrans in good yields and with high enantioselectivities (up to 90% ee)

Self-Adhesive, Conductive, and Antibacterial Hydrogel Nanofiber Composite as a Flexible Strain Sensor

With the surging demand for wearable sensor devices, the collective focus of the wearable field has shifted to developing flexible and highly resilient hydrogel sensors with strong adhesiveness. In this study, hydrogel nanofiber composites were fabricated using an interpenetrating framework comprising thermoplastic polyurethane nanofibers and tannic acid-derived adhesive hydrogels. The resultant hydrogel nanofiber composites were distinguished based on their suppleness and adhesion. The material adhered to the human skin surface and an array of other surfaces while displaying commendable extensibility. The substance also exhibited remarkable antibacterial attributes and durability. Because of these advantageous attributes, the synthesized hydrogel nanofiber composite can be used to develop flexible strain sensors for tracking microscopic physiological signals and human movements. Notably, manipulators can be used with these hydrogel nanofiber composites to grasp items and make various digital gestures. The findings of this study are expected to drive research on hydrogel strain sensors in the near future

Self-Adhesive, Conductive, and Antibacterial Hydrogel Nanofiber Composite as a Flexible Strain Sensor

With the surging demand for wearable sensor devices, the collective focus of the wearable field has shifted to developing flexible and highly resilient hydrogel sensors with strong adhesiveness. In this study, hydrogel nanofiber composites were fabricated using an interpenetrating framework comprising thermoplastic polyurethane nanofibers and tannic acid-derived adhesive hydrogels. The resultant hydrogel nanofiber composites were distinguished based on their suppleness and adhesion. The material adhered to the human skin surface and an array of other surfaces while displaying commendable extensibility. The substance also exhibited remarkable antibacterial attributes and durability. Because of these advantageous attributes, the synthesized hydrogel nanofiber composite can be used to develop flexible strain sensors for tracking microscopic physiological signals and human movements. Notably, manipulators can be used with these hydrogel nanofiber composites to grasp items and make various digital gestures. The findings of this study are expected to drive research on hydrogel strain sensors in the near future

Self-Adhesive, Conductive, and Antibacterial Hydrogel Nanofiber Composite as a Flexible Strain Sensor

With the surging demand for wearable sensor devices, the collective focus of the wearable field has shifted to developing flexible and highly resilient hydrogel sensors with strong adhesiveness. In this study, hydrogel nanofiber composites were fabricated using an interpenetrating framework comprising thermoplastic polyurethane nanofibers and tannic acid-derived adhesive hydrogels. The resultant hydrogel nanofiber composites were distinguished based on their suppleness and adhesion. The material adhered to the human skin surface and an array of other surfaces while displaying commendable extensibility. The substance also exhibited remarkable antibacterial attributes and durability. Because of these advantageous attributes, the synthesized hydrogel nanofiber composite can be used to develop flexible strain sensors for tracking microscopic physiological signals and human movements. Notably, manipulators can be used with these hydrogel nanofiber composites to grasp items and make various digital gestures. The findings of this study are expected to drive research on hydrogel strain sensors in the near future