2,3-(2,2′-Biphenylylene)-5-phenyltetrazolium chloride has been prepared. The ESR spectra of 2,3,5-triphenyltetrazolyl and 2,3-(2,2′-biphenylylene)-5-phenyltetrazolyl have been measured and their ESR coupling constants determined.
4-Isopropenyl-1-methylcyclohexene undergoes hydrogenation over ZrO2 and ThO2 to 4-isopropyl-1-methylcyclohexene, while it undergoes mainly dehydrogenation over MgO, CaO, and La2O3 to 1-isopropyl-4-methylbenzene. The activity variation of catalysts with pretreatment temperature and the reaction of 4-isopropyl-1-methyl-1,3-cyclohexadiene suggest that selectivity is determined by relative activity for hydrogenation to that for double bond isomerization.
Phosphorescence spectra and lifetimes of poly(2-vinylnaphthalene) and copolymers of 2-vinylnaphthalene and phenyl vinyl ketone have been measured as a function of the composition ratio between the constituent benzoyl and naphthyl groups in both rigid and fluid solutions.
Rare Earth orthophosphates have been synthesized and examined by X-ray diffraction, DTA and TGA. Six types have been found: a) the monazite type RPO4, b) the xenotime type RPO4, c) the hexagonal form RPO4·0.5H2O, d) the weinschenkite type RPO4·2H2O, e) the orthorhombic form DyPO4·1.5H2O and f) the amorphous phosphate.
Oxidative dehydrogenation of three kinds of the title compounds, meso[1R(S), 3S(R), 8S(R), 10R(S)]-, rac[1S(R), 3R(S), 8S(R), 10R(S)]-, and optically active[1S, 3R, 8S, 10R]-forms produced the complexes with four isolated imine groups. Some spectroscopic data of the tetraimine complexes are presented.
As a possible biological standard reference material for metal analysis, shark powder has been prepared from the muscle of sharks (Squalus mitsukurii) and compared with shark paste which was prepared from the same raw material adopting the procedure of Japanese fish paste production. With respect to the homogeneity of metal contents and to the stability during storage, both samples were found to be similar.
Two new complexes, [Co(meso-dpen)3]3+ and [Co(NH3)4 (meso-dpen)]3+ have been obtained, where meso-dpen denotes meso(R,S)-1,2-diphenyl-1,2-ethanediamine. The former is stable in the solid state, but decomposes slowly in solution at room temperature, while the latter is stable in solution.
The reaction of several thio-substituted cyclopropenium ions with iminopyridinium and sulfonium ylides in organic solvents at reflux and room temperature under N2 gave N,N′-dicyclopropenylidene urea derivatives, together with some unidentified compounds.
The 1,4-dihydronicotinamide reduction of isoalloxazines and acridinium ion was examined in cationic (CTAB, CPyB), anionic (SDS), and nonionic (POOA, Brij35) micelles. The micellar effect is accounted for by micellar stabilization (or destabilization) of the micelle-bound species.
Photoreaction of ethyl chloroacetate with cumene gives ethyl cumenylacetates (17.5%) in the ratio o : m : p = 17 : 46 : 37. The same reaction with t-butylbenzene gives ethyl t-butylphenylacetate (23%) in the ratio o : m : p = trace : 65 : 35. Addition of BF3 increases the total yield of the substitution products. Orientations together with those for toluene and anisole in ethoxycarbonylmethylation were discussed in terms of INDO-type MO calculation of the lowest singlet excitation energies.
The reactions of benzyl 4,6-O-benzylidene-2-benzyloxycarbonylamino-2-deoxy-3-O-mesyl-α-D-glucopyranoside (1), its N-methyl derivative (4) and 3-epimer (8) with sodium iodide in DMF were studied. Compound 1 gave several products including 2,3-alloepimine, 4 an oxazolidinone and 8 a 3-iodo derivative.
Thujopsene has been oxidized with lead tetraacetate, cobalt triacetate and manganese triacetate, to different kinds of products being 4β-acetyl-6β,10,10-trimethyltricyclo[4.4.0.01,3]decane (3) and its diacetate; 2β-acetoxymethyl-2α, 4aβ,8,8-tetramethyl- 2,3,4,4a,5,6,7,8-octahydronaphthalene (7) and widdryl acetate; 3, 7, and widdrol, respectively.
A protected cyclic hexapeptide, cyclo-(–L-Leu–L-Lys(ε-benzyloxycarbonyl)–Gly–)2 (6) was synthesized by doubling cyclization of the corresponding tripeptide azide. Compound 6 was converted by hydrogenolysis into a cyclic hexapeptide, cyclo(–L-Leu–L-Lys–Gly–)2, which was hydrolyzed by trypsin to a tripeptide, H–Gly–L-Leu–L-Lys–OH.