A novel method for synthesizingα-oxygen organoboron compounds has been developed through acylsilane-based carbene insertion reactions into C—B bonds.As coupling partners,readily available organoboron compounds(alken...A novel method for synthesizingα-oxygen organoboron compounds has been developed through acylsilane-based carbene insertion reactions into C—B bonds.As coupling partners,readily available organoboron compounds(alkenyl,allyl,and allenyl B(pin))were employed.Based on the substrates,pure insertion into C—B bonds or insertion followed by a siloxy group rearrangement process(from carbon to boron)would occur,delivering theα-oxygen organoboron compounds with great diversities.Control experiments demonstrated that the electronic effect of the substituents mainly controlled the rearrangement process.Besides,no matter which isomer of substrate(Z or E)was used,the reaction withβ-aryl-substituted alkenyl B(pin)affords both isomers of products(Z and E,separable through column chromatography).Trapping experiments indicated the triplet energy transfer process was involved.展开更多
To clarify the precipitation of silica hydrate from the real desilication solutions of aluminosilicate solid wastes by adding seeds and improve integrated waste utilization,the seeded precipitation was studied using s...To clarify the precipitation of silica hydrate from the real desilication solutions of aluminosilicate solid wastes by adding seeds and improve integrated waste utilization,the seeded precipitation was studied using synthesized sodium silicate solution containing different inorganic salt impurities.The results show that sodium chloride,sodium sulfate,sodium carbonate,or calcium chloride can change the siloxy group structure.The number of high-polymeric siloxy groups decreases with increasing sodium chloride or sodium sulfate concentration,which is detrimental to seeded precipitation.Calcium chloride favors the polymerization of silicate ions,and even the chain groups precipitate with the precipitation of high-polymeric sheet and cage-like siloxy groups.The introduced sodium cations in sodium carbonate render a more open network structure of high-polymeric siloxy groups,although the carbonate ions favor the polymerization of siloxy groups.No matter how the four impurities affect the siloxy group structure,the precipitates are always amorphous opal-A silica hydrate.展开更多
Visible light promoted C-O bond formation reaction through O-H insertion of acylsilanes with oximes has been developed.The reaction occurred under mild reaction conditions(sole blue LED irradiation in the absence of a...Visible light promoted C-O bond formation reaction through O-H insertion of acylsilanes with oximes has been developed.The reaction occurred under mild reaction conditions(sole blue LED irradiation in the absence of any catalysts or additives)with a short reaction time and afforded the corresponding oxime ethers in moderate to good yields.展开更多
基金supported by the National Natural Science Foundation of China(22101261)the Natural Science Foundation of Henan Province(232300421087,232301420045)the Zhengzhou University of China(2023ZZUJGXM168).
文摘A novel method for synthesizingα-oxygen organoboron compounds has been developed through acylsilane-based carbene insertion reactions into C—B bonds.As coupling partners,readily available organoboron compounds(alkenyl,allyl,and allenyl B(pin))were employed.Based on the substrates,pure insertion into C—B bonds or insertion followed by a siloxy group rearrangement process(from carbon to boron)would occur,delivering theα-oxygen organoboron compounds with great diversities.Control experiments demonstrated that the electronic effect of the substituents mainly controlled the rearrangement process.Besides,no matter which isomer of substrate(Z or E)was used,the reaction withβ-aryl-substituted alkenyl B(pin)affords both isomers of products(Z and E,separable through column chromatography).Trapping experiments indicated the triplet energy transfer process was involved.
基金financial support from the National Natural Science Foundation of China(No.52074364)。
文摘To clarify the precipitation of silica hydrate from the real desilication solutions of aluminosilicate solid wastes by adding seeds and improve integrated waste utilization,the seeded precipitation was studied using synthesized sodium silicate solution containing different inorganic salt impurities.The results show that sodium chloride,sodium sulfate,sodium carbonate,or calcium chloride can change the siloxy group structure.The number of high-polymeric siloxy groups decreases with increasing sodium chloride or sodium sulfate concentration,which is detrimental to seeded precipitation.Calcium chloride favors the polymerization of silicate ions,and even the chain groups precipitate with the precipitation of high-polymeric sheet and cage-like siloxy groups.The introduced sodium cations in sodium carbonate render a more open network structure of high-polymeric siloxy groups,although the carbonate ions favor the polymerization of siloxy groups.No matter how the four impurities affect the siloxy group structure,the precipitates are always amorphous opal-A silica hydrate.
基金We are grateful to the National Natural Science Foundation of China(Nos.21971001,22101002,and 21702001)for financial support.
文摘Visible light promoted C-O bond formation reaction through O-H insertion of acylsilanes with oximes has been developed.The reaction occurred under mild reaction conditions(sole blue LED irradiation in the absence of any catalysts or additives)with a short reaction time and afforded the corresponding oxime ethers in moderate to good yields.
