Synthesis of Polyether Exomethylene Paracyclophanes via an Intramolecular Pd-Catalyzed Bis-Enyne Benzannulation Protocol
摘要:
Several novel crownlike exomethylene paracyclophanes were efficiently synthesized via an intramolecular palladium-catalyzed benzannulation of conjugated bis-enynes. A method for the efficient synthesis of bis-enynes 8, bearing an oligo(oxyethylene) linkage, was developed by utilizing a two-step procedure from commercially available and inexpensive ethylene glycols. A remarkable complete reversal of reactivity of ambident dilithiated nucleophile 4 toward triflate 7 in the presence of 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) was found.
Synthesis of Polyether Exomethylene Paracyclophanes via an Intramolecular Pd-Catalyzed Bis-Enyne Benzannulation Protocol
摘要:
Several novel crownlike exomethylene paracyclophanes were efficiently synthesized via an intramolecular palladium-catalyzed benzannulation of conjugated bis-enynes. A method for the efficient synthesis of bis-enynes 8, bearing an oligo(oxyethylene) linkage, was developed by utilizing a two-step procedure from commercially available and inexpensive ethylene glycols. A remarkable complete reversal of reactivity of ambident dilithiated nucleophile 4 toward triflate 7 in the presence of 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) was found.
Processes using alpha, omega-difunctional aldaramides as monomers and crosslinkers
申请人:Andrews Allen Mark
公开号:US20060264672A1
公开(公告)日:2006-11-23
Processes using alpha, omega-difunctional aldaramides as monomers and crosslinkers are disclosed. The processes can be used to form polymers, particularly crosslinked polymers.
PROCESSES FOR PREPARING POLYMERS USING ALPHA,OMEGA-DIFUNCTIONAL ALDARAMIDES
申请人:Andrews Mark Allen
公开号:US20080146768A1
公开(公告)日:2008-06-19
Processes using alpha, omega-difunctional aldaramides as monomers and crosslinkers are disclosed. The processes can be used to form polymers, particularly crosslinked polymers.