Refernces
10.1039/a805938a
The research focuses on the synthesis and molecular structure of a silver derivative, [{Pd2(CH2C6H4P(o-tolyl)2-kC,P)2(μ3-3,5-dmpz-N,N,C4)2Ag(μ-ClO4)}2], which exhibits an unprecedented η1-azolato coordination. The study aims to explore the chemistry of dimetallic compounds containing two mazolato bridging groups, particularly focusing on dirhodium and diiridium derivatives, and their various chemical properties. The researchers reacted [Pd2(CH2C6H4P(o-tolyl)2-kC,P)2(μ3,5-dmpz)2] with AgClO4 to produce the palladium-silver derivative, which features a unique coordination mode where the 3,5-dimethylpyrazolato (3,5-dmpz) groups are η1-coordinated to the silver atom through the C4 atom of each dmpz ligand. The conclusions drawn from the study highlight the novel structural feature of the compound and the potential for further complexation in the electron-rich region between the two azolato rings. The chemicals used in this process include [Pd2(CH2C6H4P(o-tolyl)2-kC,P)2(μ3,5-dmpz)2], AgClO4, and solvents like CH2Cl2 and Et2O.
10.1016/S0008-6215(00)80760-0
The research focuses on the chemical synthesis of 2-O-(4-O-methyl-α-D-glucopyranosyluronic acid)-D-xylose (6), a compound found in xylans from gymnosperms. The purpose of this study was to develop a chemical method for synthesizing compound 6, as no previous chemical synthesis had been described. The researchers used a stereoselective synthesis approach, employing methyl 2,3-di-O-benzyl-1-chloro-1-deoxy-4-O-methyl-α-D-glucopyranuronate (2) as the glycosylating agent. The process involved reacting compound 2 with benzyl 3,4-di-O-benzyl-β-D-xylopyranoside (1) in the presence of silver perchlorate and triethylamine to produce intermediates, which were then subjected to catalytic hydrogenolysis to obtain the desired methyl esters. The final product, compound 6, was obtained through saponification of one of these esters.
10.1246/cl.1991.533
The research focuses on the development of a highly stereoselective synthesis method for α-glucosides from 1-O-acetyl glucose using a novel catalyst system composed of tin(IV) chloride and silver perchlorate. The purpose of this study was to address the challenges in carbohydrate chemistry, particularly the stereoselective synthesis of 1,2-cis glycosides, which are difficult to prepare due to the absence of neighboring group effects. The researchers successfully achieved high yields and selectivity in the synthesis of α-glucosides by utilizing this catalyst system, which activates the anomeric acetoxy group of 1-O-acetyl glucose and stabilizes the intermediate salt with a perchlorate ion, blocking the β-side and allowing preferential attack from the α-side by silyl alkoxides.
10.1021/jo00140a025
The research investigates the silver(1)-promoted rearrangement of cyclopropene derivatives, comparing these reactions to thermolysis and photolysis. Key chemicals involved include various cyclopropene compounds such as 1,3-diphenyl-2-methyl-3-benzylcyclopropene and 3-benzyl-1,2,3-triphenylcyclopropene, which undergo rearrangement to form indene derivatives under the influence of silver perchlorate. Other chemicals like benzylmagnesium chloride and phenylmagnesium bromide are used in the synthesis of intermediate compounds. The study also explores the effects of substituents on the cyclopropene ring, such as allyl and methyl groups, and how these influence the reaction outcomes. Silver perchlorate plays a crucial role as the catalyst for the rearrangement reactions, leading to the formation of products like bicyclo[3.1.0]hex-2-ene derivatives and indenes. The research provides insights into the regioselectivity and stereochemistry of these reactions, proposing mechanisms involving the formation of argentio- carbonium ions and subsequent cyclization or bond cleavage.