40628-41-9Relevant articles and documents
Controlled/ living reverse atom transfer radical polymerization of a monocyclic olefin, methyl 1-cyclobutenecarboxylate
Chen, Xiao-Ping,Sufi, Bilal A.,Padias, Anne Buyle,Hall Jr.
, p. 4277 - 4281 (2002)
ATRP of the first cyclic olefin, methyl 1-cyclobutenecarboxylate (MCBE), by addition polymerization in a well controlled/ living manner is described, along with a new practical method to synthesize MCBE. The polydispersity of poly(methyl 1-cyclobutenecarboxylate) (PMCBE) synthesized by a conventional ATRP initiation system was narrow (Mw/Mn = 1.1 - 1.4), but Mn was usually less than half of the theoretical number-average molecular weight. However, the polymerization of MCBE initiated by a reverse ATRP initiation system, AIBN/CuBr2/dNbpy, was well controlled; the rate of polymerization was first order in monomer, and the molecular weights of the polymers were close to the designed values with very narrow polydispersities (Mw/Mn = ～1.15). The obtained polymer PMCBE can be used as a macroinitiator to further polymerize a second monomer, such as styrene.
ALTERNATING RING-OPENING METATHESIS POLYMERIZATION
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, (2011/09/20)
The invention relates to the field of polymers and olefin polymerization, and more specifically olefin metathesis polymerization. The invention provides regioregular alternating polymers and methods of synthesizing such polymers.
Synthesis and chemical transformations of 2-cyclopropyl-2-diazoacetates
Prokopenko,Okonnishnikova,Klimenko,Shulishov,Tomilov
, p. 1515 - 1521 (2008/09/18)
Methyl 2-cyclopropyl-2-diazoacetate was synthesized from acetylcyclopropane in few chemical steps in ～55% total yield. Its copper or rhodium-catalyzed dediazoniation exclusively proceeds through the intramolecular isomerization of generated cyclopropyl(methoxycarbonyl)carbene to 1-methoxycarbonylcyclobutene, irrespective of the presence or the absence of unsaturated compounds. However, in the presence of acrylates or strained cycloalkenes, this diazo ester is being slowly involved into the 1,3-dipolar cycloaddition, giving cyclopropyl- substituted pyrazolinecarboxylates, which in case of 1-pyrazolines easily lose nitrogen molecule to selectively afford 1-cyclopropylcyclopropanecarboxylate derivatives.
