Process for making polyphenols from ketones or aldehydes and phenols
申请人:The Dow Chemical Company
公开号:US05463140A1
公开(公告)日:1995-10-31
A process for the condensation of an aldehyde or ketone starting material with a phenol, unsubstituted in the 4-position, comprises reacting the aldehyde or ketone starting material with the phenol in a reaction mixture in the presence of a soluble or insoluble mercaptosulfonic acid compound under conditions sufficient to bring about formation of a geminal bisphenolic moiety at each aldehyde or ketone moiety in the starting material. A miscible mercaptosulfonic acid compound is characterized by the formula (HS).sub.a -.theta.-(SO.sub.3 H).sub.b or a precursor thereof, wherein .theta. is an alkylene, cycloaliphatic, arylene, alkylenearylene, alkylenecycloaliphatic, alkylenearyl, heterocyclic or alkyleneheterocyclic residue. Heterogeneous catalysts comprise insoluble materials comprising catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support; or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
Polymeric substrate containing mercapto and sulfonic groups
申请人:The Dow Chemical Company
公开号:US06051658A1
公开(公告)日:2000-04-18
A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support; or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
Supported mercaptosulfonic acid compounds useful as catalysts for
申请人:The Dow Chemical Company
公开号:US06133190A1
公开(公告)日:2000-10-17
A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by the formula: ##STR1## L is an optional linking group and--is a bond, which catalytically-active species is attached by the bond--to an insoluble organic or inorganic support; or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group,--is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
in covalent targeted inhibitors in drug discoveryagainst previously “undruggable” sites and targets. These molecules typically feature an electrophilic warhead that reacts with nucleophilic groups of protein residues, most notably the thiol group of cysteines. One main challenge in the field is to develop versatile utilizable warheads. Here, we characterize the unique features of novel arsenous warheads