bluuebunny/crossref_metadata_2025_split huggingface dataset:
Theoretical Studies on the Potential Energy Surfaces of SO2: Electronic States for Photodissociation from the \ ildeC1B2 State
Authors: Kamiya Kenshu , Matsui Hiroyuki 
Published: July 2006

Abstract
The potential energy surfaces of electronically excited states of SO2 have been investigated with ab initio molecular orbital method: Especially, the two-dimensional potential energy surface for the \ ildeC1B2 (21A′) state as a function of both the bond angle and bond distance has been carefully analyzed, including the spin-orbit interaction. Energetically, 23A′ (13A1 in C2v) was found to be the most grobable state which concerns the reaction mechanism for the photodissociation pathway from the \ ildeC state (SO2 (\ ildeC1B2)→SO(3∑−)+O(3P)); however, other pathway may also be possible to go over the avoided crossing on a singlet potential surface.
Infrared Spectra and Intramolecular Hydrogen Bonding of 4-(Haloacetylamino)diphenylamines
Authors: Suezawa Hiroko , Hirota Minoru , Hamada Yoshiki , Takeuchi Isao , Kawabe Takae 
Published: July 2006

Abstract
Infrared NH stretching absorptions and 1H NMR chemical shifts of a series of 4-(haloacetylamino)diphenylamines were reported. The halogen atoms in haloacetamido groups are shown to participate in the intramolecular NH···X hydrogen bond. The hydrogen bond tends to be strengthened in the increasing order of atomic number of the acceptor halogen atoms.
Thermal Behavior of Alkaline-Earth Metal cyclo-Tetraphosphates
Authors: Nariai Hiroyuki , Motooka Itaru , Kanaji Yukio , Tsuhako Mitsutomo 
Published: July 2006

Abstract
The effect of water vapor on the thermal behavior of alkaline-earth metal cyclo-tetraphosphates, M2P4O12·nH2O (n=7.0, 3.5, 5.5, and 4.0 for M=Mg, Ca, Sr, and Ba, respectively) (P4m) was examined using DTA-TG, X-ray diffraction analysis, isothermal heating in an electric furnace, and HPLC-FIA. The calcination reaction of each P4m proceeded via ring opening of P4m with elimination of water of crystallization, followed by condensation of soluble oligophosphates (Poligo) to insoluble polyphosphates (Phigh poly). The rates of these reactions were faster for Mg2P4m than for other metal cyclo-phosphates. The decomposition of P4m was appreciably faster in humid air than in dry air, because of the availability of water for hydrolysis and for breaking the P–O–P linkage. However, the effect of water vapor from the atmosphere was not conspicuous, since the atmosphere contains enough water (theor. 20 mg L−1) for the hydrolysis of P4m. The products of calcination of Ba2P4m·4H2O were hardly influenced by water vapor from the atmosphere, because the water of crystallization was not easily released in the Ba system compared with the other metal salts.
Oxidative Dimerization of 1-Propyne on a 2-Pyridylethyl Copper Complex Fixed Silica Catalyst
Authors: Ukisu Yuji , Kazusaka Akio , Nomura Masaharu 
Published: July 2006

Abstract
A 2-pyridylethyl copper complex fixed silica catalyst was applied to an oxidative-coupling dimerization reaction of 1-propyne to 2,4-hexadiyne at 100 °C, which is a typical test reaction for Cu–(N base)-complex catalyst in the homogeneous phase. It was found to be highly catalytically active for this reaction compared with a conventional CuO/SiO2 catalyst. The reaction was deduced to proceed through a redox cycle of copper ions coordinated with the pyridine derivative.
Substituent Effects in the Solvolysis of p-(2-Substituted Cyclopropyl)-α-Methylbenzyl Chlorides
Authors: Kusuyama Yoshiaki , Kubo Takako , Iyo Masami , Kagosaku Tamami , Tokami Kenjiro 
Published: July 2006

Abstract
The solvolysis rates of p-(cis- or trans-2-substituted cyclopropyl)-α-methylbenzyl chlorides including electron-donating and electron-attracting substituents relative to a hydrogen substituent were measured in 80% aqueous acetone. The trans isomers were more reactive than the corresponding cis derivatives where cyclopropyl and phenyl groups could not get a most favorable “bisected” conformation for the cyclopropyl group to release electrons to the benzene ring. The relative rates of the trans isomers at 45°C were best correlated by means of σm values with a ρ value of −3.14 and a correlation coefficient of 0.97, indicating that the cyclopropane ring was a poor transmitter of a resonance effect. The substituent effects were analyzed by means of the LSFE equation.
Photochemical Hydroformylation of Olefins in the Cobalt-Phosphine Catalyst System
Authors: Mori Sadayuki , Tatsumi Shunji , Yasuda Masaki , Kudo Kiyoshi , Sugita Nobuyuki 
Published: July 2006

Abstract
Cobalt-catalyzed hydroformylation of olefins was found to proceed even at ambient temperature under UV irradiation in the presence of phosphine. Extremely high selectivity toward straight-chain aldehyde (99% in case of 1-hexene) was obtained by lowering the partial pressure of carbon monoxide at ambient temperature. A catalytic species different from the well-known species under high pressure of carbon monoxide and high temperature contributed to the highly selective formation of straight-chain aldehydes. Two photochemical processes were suggested to be involved in the photochemical hydroformylation reaction, that is, the formation of HCo(CO)3PBu3 from the cationic cobalt species, [Co(CO)3(PBu3)2]+, and then the formation of the coordinatively unsaturated hydride, HCo(CO)2PBu3.
Unusual Solvent Effect on the Cycloadditions of Aromatic Nitrile N-Oxide with Alkyl Substituted p-Benzoquinones in Ethanol–Water Systems
Authors: Inoue Yukihiko , Araki Koji , Shiraishi Shinsaku 
Published: July 2006

Abstract
The second-order rate constants of 1,3-dipolar cycloaddition reactions of 2,6-dichlorobenzonitrile N-oxide (1) with 2,5-dimethyl-p-benzoquinone (2a) or 2,6-diisopropyl-p-benzoquinone in various solvents at 20°C were determined by spectrophotometric method. The rate of 1 and 2a in ethanol : water=60 : 40 solution was 5.55×102 dm3 mol−1 s−1, which was fourteen folds of that in chloroform (3.9×10−3 dm3 mol−1 s−1). This solvent effect and the low solubility of the cycloadduct in aqueous ethanol were successfully applied to the cycloadduct synthesis.
Absolute Stereochemistry and Novel Ring-Opening Oxidation of Methyl (R)-2-Hydroxysterculate
Authors: Nakatani Munehiro , Hase Tsunao 
Published: July 2006

Abstract
A cyclopropene-ring-containing fatty acid ester, methyl (R)-2-hydroxysterculate, was isolated from Hibiscus rosa-sinensis along with methyl sterculate and malvalate. The stereochemistry of the asymmetric carbon at C-2 was determined as R by applying a dibenzoate chirality method, and a mild air oxidation afforded two conjugated enone isomers accompanying a ring opening.
Raman Spectra of N,N-Dimethylthioacetamide Adsorbed on Silver and Copper Electrode Surfaces
Authors: Loo Boon Hian , Lee Yue Guey , Kato Tamihiko 
Published: July 2006

Abstract
Surface-enhanced Raman (SER) spectra have been obtained from N,N-dimethylthioacetamide (DMTA) adsorbed on Ag and Cu electrode surfaces. Vibrational analysis of the SER spectra of DMTA is made in comparison to the bulk-phase Raman spectrum of DMTA, and the infrared data on Co, Cu, and Hg complexes of DMTA. It is concluded that the DMTA molecule is bonded through its S atom to Ag and Cu surfaces.
Adsorption-Induced Unusual Changes in the Electrical Conductivity of Some Ferrocene Derivatives
Authors: Bhattacharjee Ashis , Mallik Biswanath 
Published: July 2006

Abstract
The effects of adsorption of different organic vapors on the electrical conductivity of some ferrocene derivatives have been studied using the sandwich cell technique. A conductivity peak is observed in the plot of measured current versus temperature for a sandwich cell of powdery material with some adsorbed vapors. The dependence of the intensity of the peak and the temperature at which it appears have been studied as a function of grain size of powdery materials, heating rate, amount of adsorbed vapor, and also the nature of the adsorbed vapors. At the vapor-adsorbed state these materials show very high value of activation energy and the pre exponential factor σo (in the usual semiconduction equation). Results indicate that the adsorption is a physical adsorption. The usual mechanisms for the adsorption-induced change in conductivity and activation energy are not suitable for explaining the observed results. Adsorption induced reversible structural phase transition seems responsible for the anomalous behavior of the adsorption-induced changes in the electrical properties of these materials. The results obtained with different ferrocene derivatives have been compared with that of ferrocene and possible reason for the adsorption induced phase transition is discussed.
The Crystal Structure of (BEDT-TTF)4[Ni(CN)4]
Authors: Kawamoto Atsushi , Tanaka Masashi , Tanaka Jiro 
Published: July 2006

Abstract
The crystal of (BEDT-TTF)4[Ni(CN)4] (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene) belongs to the triclinic P\bar1 with the lattice constants of a=10.994(2), b=16.443(2), c=9.703(1) Å, α=97.85(1), β=115.15(1), γ=95.94(1)°. In the crystal, there exists the face to face overlap of the BEDT-TTF molecules along the [201] direction. The intermolecular interaction by the short S···S contact is also observed along the [\bar201] direction.
New Crystalline Complexes Composed of a Fatty Acid and Nicotinamide
Authors: Yokoyama Shoko , Ueda Fumio , Fujie Tadao 
Published: July 2006

Abstract
New crystalline complexes composed of a fatty acid (FA) and nicotinamide (NAA) at a molar ratio of 6 : 5, (FA)6(NAA)5, have been isolated. The melting points of (FA)6(NAA)5 were higher than those of the corresponding equimolar complexes, (FA)6(NAA)6.
Mechanism of Reaction of S,S-Diphenyl-S-methoxythiazyne with Thiols
Authors: Yoshimura Toshiaki , Tsukurimichi Eiichi , Sugiyama Yasuhisa , Kita Hiroshi , Shimasaki Choichiro , Hasegawa Kiyoshi 
Published: July 2006

Abstract
The reaction of S,S-diphenyl-S-methoxythiazyne with various thiols gave methyl sulfides. Kinetic investigations support a mechanism involving an initial protonation of the thiazyne nitrogen with thiol followed by a nucleophilic attack of thiolate anion on the methyl group.
Simple Preparation of (2,2′-Biphenylylene)phenylphosphine Oxide and Role of Triphenylphosphine Oxide as a Mediator for Formation of Biaryl Derivatives
Authors: Ogawa Satoshi , Tajiri Yoko , Furukawa Naomichi 
Published: July 2006

Abstract
(2,2′-Biphenylylene)phenylphosphine oxide (3) was prepared simply by the reaction of triphenylphosphine oxide (1) with phenyllithium and subsequently with aqueous hydrogen peroxide in acetic acid. The oxide 3 reacted with lithium diisopropylamide (LDA) and then with several electrophiles to afford regiospecifically ortho-substituted compounds in moderate yields, which were converted to unsymmetrical 2-and 2,3′-substituted 1,1′-biaryls and triphenylphosphine oxide (1).
Base-Induced Addition-Elimination Reactions of Electron-Deficient Vinylarenes Containing a Carbonyl or Ester Group Utilizing 4-Phenyl-3H-1,2,4-triazole-3,5(4H)-dione(PTAD)
Authors: Seguchi Kazuyoshi , Tanaka Satoko 
Published: July 2006

Abstract
The reaction of electron-deficient vinylarenes such as styrylketones and cinnamate with PTAD afforded double Diels–Alder products and Diels–Alder ene products; the latter underwent novel base-induced elimination of 4-phenyl-1,2,4-triazolidine-3,5-dione via a stable carbanion.
Synthetic Application of Benzothiazole Ring System as an On-Off Type of Leaving Group. Synthesis of Ketones and Carboxylic Acid Derivatives from 2-(1-Substituted 1-Hydroxyalkyl)- and 2-(1-Hydroxyalkyl)benzothiazoles
Authors: Chikashita Hidenori , Ishihara Masayuki , Takigawa Katsumi , Itoh Kazuyoshi 
Published: July 2006

Abstract
A synthetic and systematic use of benzothiazole ring system as an “on-off” type of leaving group was developed for the preparation of ketones and carboxylic acid derivatives from a variety of 2-(1-substituted 1-hydroxyalkyl)- and 2-(1-hydroxyalkyl)benzothiazoles (off state) via the corresponding benzothiazolium salts (on state) obtained by the quaternization (on switch). A variety of 3-methyl-2-(1-substituted 1-hydroxyalkyl)benzothiazolium iodides (1) underwent a carbon–carbon bond cleavage at the 2-position to give the corresponding ketones on the simple treatment with a base under mild reaction conditions. The similar reaction of 3-methyl-2-(1-hydroxy-alkyl)benzothiazolium iodides (2) to aldehydes proceeded less efficiently. The oxidative reaction of a variety of 2 with base and nonactivated MnO2 in ethanol afforded the corresponding ethyl esters. This type of oxidative reaction could be also achieved in THF with different nucleophiles such as alcohol, water, thiol, and amine to give the corresponding ester, carboxylic acid, thioester, and amide, respectively.
Effect of Bromotrifluoromethane on the Ignition in Methane and Ethane–Oxygen–Argon Mixtures behind Shock Waves
Authors: Suzuki Akimichi , Inomata Tadaaki , Jinno Hiroshi , Moriwaki Takao 
Published: July 2006

Abstract
The ignition delay times behind shock waves in CH4–, and C2H6–O2–Ar systems containing CF3Br were measured for a range of temperatures between 1400 and 2100 K and pressures between 1.5 and 3.5×105 Pa. These measurements indicated that CF3Br promotes the ignition of CH4 but inhibits the ignition of C2H6. Although the inhibition effect for C2H6 increases with increasing CF3Br concentration and decreasing temperature, the promotion effect in CH4 was independent of both the CF3Br concentration and the temperature in this experiment. We calculated the induction times for conditions similar to the experiments using a model which included 49 elementary reactions related to CF3Br. Calculations using this model gave induction times that were in good agreement with the experiments. The calculated values, however, depended on several effective reactions among the 49 reactions.
Triplet Intermediates in Cis– Trans Photo-isomerization of 3-Chrysenylethylenes
Authors: Karatsu Takashi , Hiresaki Tatsuro , Arai Tatsuo , Sakuragi Hirochika , Tokumaru Katsumi , Wirz Jakob 
Published: July 2006

Abstract
The effect of substitution of 3-chrysenyl group (Ar) on unsaturated double bonds in their triplet sensitized isomerization was investigated for Ar–CH=CH–R, R=′Bu (BC) and Ph (SC) by means of stationary irradiations, laser flash photolyses, and MO calculations. Both olefins undergo mutual isomerization between their cis- and trans-isomers. However, BC has a unique triplet energy surface with two decay funnels at the planar trans (3t*) and twisted (3p*) conformations, which are in equilibrium with each other; 3t* undergoes either unimolecular decay to the ground-state trans isomer or triplet energy transfer to the cis isomer (quantum chain process) and 3p* decays to the ground state to give the cis and trans isomers. Tn←T1 absorptions observed for BC and SC are mainly attributed to 3t* and 3p*, respectively, on the basis of semiempirical MO calculations. The populations at 3t* and 3p* are estimated.
Oxidation Using Quaternary Ammonium Polyhalides. VIII. Oxidation of 1,4-Benzenediols with Benzyltrimethylammonium Tribromide
Authors: Kajigaeshi Shoji , Morikawa Yukihiro , Fujisaki Shizuo , Kakinami Takaaki , Nishihira Keigo 
Published: July 2006

Abstract
The reaction of 1,4-benzenediols with 1.1 equiv of benzyltrimethylammonium tribromide in dichloromethane in the presence of aqueous sodium acetate at room temperature gave 2,5-cyclohexadiene-1,4-diones in good yields. On the other hand, the reaction of 1,4-benzenediols with a large excess of the reagent in aqueous acetic acid at 40–60°C gave polybromo-substituted 2,5-cyclohexadiene-1,4-diones in good yields.
Kinetic Studies of Oxygen Atom Transfer Reactions between Various cis-Dioxobis(dithiocarbamato)molybdenum(VI) Complexes and Triphenylphosphine
Authors: Unoura Kei , Kato Yoshikiyo , Abe Katsuaki , Iwase Akio , Ogino Hiroshi 
Published: July 2006

Abstract
The kinetics of the oxygen atom transfer reactions between cis-[MoO2(R2dtc)2] [R=CH3, C2H5, i-C3H7, i-C4H9, C6H5CH2 (Bz), C6H5 (Ph)] and PPh3 (coupled reactions 1 and 2) have been investigated.
[MoO2(R2dtc)2]+PPh3\xrightarrowk1[MoO(R2dtc)2]+OPPh3 (1)
[MoO2(R2dtc)2]+MoO(R2dtc)2]\oversetKd\ightleftharpoons[Mo2O3(R2dtc)4] (2)
The rate constants (k1) of oxygen atom transfer reaction 1 correlate with the formal potentials of [MoO2(R2dtc)2]0⁄−1 except for R=Bz and Ph. The equilibrium constant values (Kd) of dimerization reaction 2 decrease with increase of the electron-donating ability of the substituents on the dithiocarbamate ligands.
Determination of the Absolute Configuration and Enantiomeric Purity of Allylic and Acetylenic Alcohols
Authors: Yasuhara Fujiko , Yamaguchi Shozo , Takeda Masayuki 
Published: July 2006

Abstract
The relative magnitude of steric bulk of saturated vs. unsaturated substituents in the title compounds has been estimated by a lanthanoid induced shift (LIS) study of these (R)-(+)-α-methoxy-α-(trifluoromethyl)phenylacetate esters [(R)-(+)-MTPA esters] by 1H NMR spectroscopy:
CH2=C(Me)−&gt;Pentyl&gt;n−Pr&gt;Et\simeqCH2=CH−&gt;Me&gt;CH≡C−;Ph&gt;Cyclohexyl
These results allow the assignment of the absolute configurations of both cyclic and acyclic unsaturated alcohols. Furthermore, the relative intensity of well-separated OMe signals for those diastereomeric MTPA esters can be used for the determination of the %ee of the original alcohols.
Laser Photolysis Studies on [2+2]-Photocycloreversion and Photoisomerization Reactions of trans- and cis-1,2-Di(1-pyrenyl)cyclobutane Dimers through Radical Ion Intermediates
Authors: Tsuchida Akira , Yamamoto Masahide , Nishijima Yasunori 
Published: July 2006

Abstract
Transient radical ion intermediates of [2+2]-photocycloreversion and photoisomerization reactions of the 1-vinylpyrene (1) cyclobutane dimers, trans- and cis-1,2-di(1-pyrenyl)cyclobutanes (2t and 2c, respectively), were studied by nanosecond laser photolysis measurements; the reaction quantum yields were determined by photoproduct analysis. The excited singlet state of dimers 2t and 2c was quenched by an electron acceptor, 1,4-dicyanobenzene, with a diffusion-controlled rate in a polar acetonitrile solvent. The transient absorption spectra of the dimers in the system showed the formation of a dimer radical cation of pyrene chromophores, whose positive charge was delocalized in the two pyrene rings. The dimers were cleaved to form 1 through the dimer radical cation. By contrast, the formation of a dimer radical anion could not be observed in quenching by an electron donor, N,N-dimethyl-p-toluidine. The cleavage yield of the dimers from the anionic species was low. The decrease in the electron density in the cyclobutane bond in the cationic state promotes the cycloreversion reaction of dimers. In the absence of an electron donor or acceptor in the nonpolar benzene solvent, the direct photocleavage of 2t and 2c to 1 through the singlet excited state occurred efficiently, whereas in polar acetonitrile the cleavage was reduced to half by solvation of the excited states. A photocleavage of dimers also occurred in their triplet states.
Structures of Diterpenoid Tropolones, Salviolone and Miltipolone, from the Root of Salvia miltiorrhiza Bunge
Authors: Haro Ginda , Mori Masahito , Ishitsuka Midori O , Kusumi Takenori , Inouye Yoshinobu , Kakisawa Hiroshi 
Published: July 2006

Abstract
New types of a bisnorditerpenoid and a norditerpenoid possessing a benzotropolonoid and a tropolonoid moieties, salviolone (8) and miltipolone (15), respectively, have been isolated and their structures were determined by spectroscopic methods. The structure of salviolone was confirmed by a total synthesis. These compounds exhibit cytotoxic activities against cultured cells.
Oxidation of 4,6,8-Trimethylazulene and Guaiazulene with Hydrogen Peroxide in Pyridine
Authors: Matsubara Yoshiharu , Morita Masanori , Takekuma Shin-ichi , Nakano Tomohiro , Yamamoto Hiroshi , Nozoe Tetsuo 
Published: July 2006

Abstract
Oxidation of 4,6,8-trimethylazulene (1) with hydrogen peroxide in pyridine at 25°C for 18 h gave 4,6,8-trimethyl-1,5- and -1,7-azulenequinones, their 2-(4,6,8-trimethyl-1-azulenyl) derivatives, and 2,3-dihydro-4,6- and -4,7-dimethyl-2-(4,6,8-trimethyl-1-azulenyl)-1H-inden-1-ones in much higher yields than those by autoxidation of 1 in DMF at 120°C. The same oxidation of guaiazulene afforded sixteen separable products, among which there were three new dimeric condensates.
Hydrates of Organic Compounds. XV. The Formation of Clathrate-Like Hydrates of Tetraisopentylammonium Alkanoates and Alkanedioates
Authors: Nakayama Haruo , Nakamura Kayoko , Haga Yukio , Sugiura Y\={o}ji 
Published: July 2006

Abstract
The solid-liquid phase diagrams of binary mixtures of water with tetraisopentylammonium alkanoates, [(i-C5H11)4N]CnH2n+1COO (n=0–9), and with bis(tetraisopentylammonium) alkanedioates, [(i-C5H11)4N]2-[OOC(CH2)nCOO] (n=0–10), were examined in order to confirm the formation of clathrate-like hydrates. The results are summarized as follows: (1) For all the compounds examined the formation of a clathrate-like hydrate is newly confirmed; (2) the melting points of these hydrates are fairly high (lie between 10 and 28°C); (3) typical hydrates formed by the alkanoates have hydration numbers around 38 and those formed by the alkanedioates around 80; and (4) hydrates with hydration numbers around 14 and larger than 40 are also found for the alkanoate hydrates and around 30 and larger than 80 for the alkanedioate hydrates. The effects of the alkyl chain length of the alkanoate anion and of the methylene chain length of the alkanedioate anion on the stability of the hydrates are not marked, suggesting that a hydrogen-bonded framework of water molecules around a (i-C5H11)4N+ cation is fairly stable.
Back Biting Reactions during the Catalytic Decomposition of Polyethylene
Authors: Ishihara Yumiko , Nanbu Hidesaburo , Saido Katsuhiko , Ikemura Tadashi , Takesue Tomoyuki 
Published: July 2006

Abstract
Isobutane and isopentane were selectively obtained by polyethylene catalytic decomposition using the NaY-type zeolite catalyst. Back biting reactions are thus essential to gas formation during the catalytic decomposition of polyethylene. Chain-end secondary carbonium ions cause back biting reactions involving intramolecular rearrnagement to form the C9 fraction. Isobutane and isopentane are then produced by decomposition of the gasification precursor C9 fraction.
Cis-Trans Isomerism among the Octahedral Diaquabis(N,N- or N,N′-dialkylethylenediamine)nickel(II) Complexes and Their Thermal Reaction Products
Authors: Ihara Yoshinori , Satake Yasuhiro , Suzuki Masatatsu , Uehara Akira 
Published: July 2006

Abstract
The thermochemical changes in coordination structure of diaquabis(N,N- or N,N′,-dialkylethylenediamine)nickel(II) complexes ([Ni(H2O)2(diamine)2]X2·nH2O) were reinvestigated by means of TG-DTA and electronic spectroscopy at room and elevated temperatures, where diamine is N,N (or N,N′-dimethylethylenediamine (NN- or NN′-dmen) or N,N-(or N,N′)-diethylethylenediamine (NN- or NN′-deen); X is Cl−, Br−, I−, or NO3−; n is 0, 1, 2, or 3. The diaqua complexes prepared were all trans except for cis-[Ni(H2O)2(NN-dmen)2]I2. The trans complexes with the symmetric (N,N′-dialkylsubstituted) diamines brought about a deaquation-anation upon heating, retaining the original trans configuration, while those with the asymmetric (N,N-dialkylsubstituted) diamines transformed into the cis complexes. In the case of the NN-dmen complexes, cis-halogenoaqua species were isolated as a stable intermediate during the thermal reactions. The complex nitrates changed to trans-dinitrato or cis-mononitrato species depending upon the diamines. The effects of the N-substituents in the diamines and of the anions on the patterns of thermal reactions were also discussed.