Showing papers by "Yoshio Iwakura published in 1973"
TL;DR: One isomer, perhydro-1,5-diazocine-2,4-dione, was obtained exclusively by the double Beckmann-rearrangement reactions of cyclohexane 1,3-dioxime dioxime as discussed by the authors.
Abstract: One isomer, perhydro-1,5-diazocine-2,4-dione, was obtained exclusively by the double Beckmann-rearrangement reactions of cyclohexane-1,3-dione dioxime. It is suggested that the other possible isomer was decomposed by a transannular reaction. Perhydro-1,5-diazocine-2,4-dione was polymerized in the solid state in the presence of water vapor and produced polytrimethylenemalonamide. Further, this monomer was polymerized in the molten state without water. 7-Methyl- and 7,7-dimethyl-perhydro-1,5-diazocine-2,4-dione were prepared, and the latter was polymerized in molten state. Differential thermal analyses of the monomer and x-ray diffraction measurements of the polymers were carried out.
8 citations
TL;DR: In this paper, the ORD and circular dichroism of poly(oxyisobutylidenecarbonyl) (II) were compared with those of its optically active oligomers (III).
Abstract: Optical rotatory dispersion (ORD) and circular dichroism (CD) of poly(oxyisobutylidenecarbonyl) (II) were investigated and compared with those of its optically active oligomers (III). The two-term DRUDE equation was applied to analyze the ORD curves using n-π*- and π-π*-transition bands as the critical wavelengths, λ0 and λ1, respectively. No drastic difference in ORD curves between the polymer and oligomers was detected in chloroform, which suggests that the polymer has no special conformation. On the other hand, in dioxane and acetonitrile λ1 of the polymer II shows a red shift in comparison with that of its oligomers.
Die ORD- und CD-Kurven von Poly(oxyisobutylidencarbonyl) wurden aufgenommen und mit denen der Oligomeren (III) verglichen. Eine zweitermige DRUDE-Gleichung wurde angewandt, um die ORD-Kurven zu beschreiben, wobei den λ0- und λ1-Werten die n-π* bzw. π-π* Ubergange zugeordnet wurden. Da keine drastischen Unterschiede zwischen den ORD-Kurven des Polymeren und der Oligomeren in Chloroform feststellbar waren, wird geschlossen, das die Polymeren in diesem Losungsmittel keine bevorzugte Konformation annehmen. Andererseits zeigen in Dioxan und Acetonitril die λ1-Werte der Polymeren Rotverschiebungen gegenuber den λ1-Werten der Oligomeren.
6 citations
4 citations
TL;DR: In this paper, a mixture of 2,3-epoxypropyl ethyl maleate and fumarate (4) was obtained from ethyl potassium maleates and 1-chloro-2,3epoxy propane, and the observed kinetic data may be divided into two parts: ko (non-catalytic rate constant) = 1,75 · 10−5 dm3 mol−1 s−1, kc (product-induced catalytic rate constants) = 2,25 · 102 dm6 mol−2 s−
Abstract: A mixture of 2,3-epoxypropyl ethyl maleate and fumarate (4) was obtained from ethyl potassium maleate and 1-chloro-2,3-epoxy propane.
Copolymerization of 4 with styrene was carried out and the monomer reactivity ratios were found to be r1 = 0,30 and r2 = 0,05 (M1: styrene, M2: ester 4). Q and e values were found to be 0,55 and 1,28, respectively. Copolymerizations of 4 with ethylene were performed to improve the chemical reactivity of polyethylene, and the reactivity was studied by means of a homogeneous reaction with dibutylamine. The observed kinetic data may be divided into two parts: ko (non-catalytic rate constant) = 1,75 · 10−5 dm3 mol−1 s−1, kc (product-induced catalytic rate constant) = 2,25 · 102 dm6 mol−2 s−1 in DMF at 70°C.
Aus Athyl-kaliummaleat und 1-Chlor-2,3-epoxypropan wurde ein Gemisch aus Athyl-2,3-epoxypropylmaleat und -fumarat (4) erhalten.
4 wurde mit Styrol copolymerisiert, und fur die Monomeren wurden die folgenden Parameter gefunden: r1 = 0,30 und r2 = 0,05 (M1 = Styrol, M2 = Ester 4). Fur Q und e wurden die Werte 0,55 bzw. 1,28 bestimmt. Copolymerisationen von 4 mit Athylen wurden durchgefuhrt, um die chemische Reaktivitat von Polyathylen zu verbessern. Diese wurde in einer homogenen Reaktion mit Dibutylamin untersucht. Die beobachteten kinetischen Daten lassen sich in zwei Konstanten ausdrucken: k0 (die nicht katalytische Geschwindigkeitskonstante) = 1,75 · 10−5 dm3 mol−1 s−1 und kc (die produktinduzierte katalytische Geschwindigkeitskonstante) = 2,25 · 10−2 dm6 mol−2 s−1 in DMF bei 70°C.
1 citations
TL;DR: In this paper, the S-substituierten Isoxazoline (I) lassen sich durch thermische Eliminierung der Substituenten X in die Isoxyazole (II) umwandeln.
Abstract: Die S-substituierten Isoxazoline (I) lassen sich durch thermische Eliminierung der Substituenten X in die Isoxazole (II) umwandeln.