Metal-catalyzed ring opening

It is not known whether or not this transformation is catalyzed by the transition metal. However, the metal-catalyzed ring-opening reaction of (3-alkoxycyclopropane carboxylates yielding vinyl ethers (e.g. 50 -> 51 and 52 - 53) is well documented 97 120 . Several catalysts are suited [PtCl2 2 PhCN, Rh2(OAc)4, [Rh(CO)2Cl]2, [Ru(CO)3Cl2]2, Cu bronze, CuCl], but with all of them, reaction temperatures higher than those needed for the carbenoid cyclopropanation reaction are required. 

Fig. 11 Cetane number of intermediates and products of the reaction pathway of metal-catalyzed ring opening of decalin via dicarbene mechanism. Adapted from ref. 12. 

Recent Developments in Metal-Catalyzed Ring-Opening Polymerization of Lactides and Glycolides Preparation of Poly lactides, Polyglycolide, and Poly(lactide-co-glycolide)... 

Recent Developments in Metal-Catalyzed Ring-Opening Polymerization... 

Methoxyfuran also reacted with vinylcarbenes that were derived from sec-O-propargyl thiocarbamates in a transition metal-catalyzed ring opening to give a mixture of geometrical isomers, as depicted below <07TL6651>. 

Two types of addition reactions involving carbenoid species have been used to synthesize cyclopropanes. The first approach, the reaction of a vinyl carbene species, obtained by a metal-catalyzed ring-opening reaction of cyclopropenes, with alkenes is discussed in Section 1.1.6.3.2., as it is, from a topological point of view, a codimerization of eyclopropene and an alkene. In this case the ring carbons of the cyclopropane are not identical to those of the eyclopropene substrate. 

Transition metal catalyzed, ring opening polymerization Dispersion, cationic polymerization Homogeneous/precipitation, cationic polymerization Homogeneous, free radical/cationic polymerization Precipitation, free radical polymerization Dispersion, free radical polymerization Norbornene polymer, polycarbonate Isobutylene polymer Vinyl ether polymer Amorphous fluoropolymers Vinyl polymer, semicrystalline fluoropolymers Polyvinyl acetate and ethylene vinyl acetate copol5Tner... 

It is not known whether or not this transformation is catalyzed by the transition metal. However, the metal-catalyzed ring-opening reaction of P-alkoxycyclopropane carboxylates yielding vinyl ethers (e.g. 50 - 51 and 52 - 53) is well documented... 

---