bluuebunny/crossref_metadata_2025_split huggingface dataset:
Boron Trifluoride Etherate-Catalyzed Backbone Rearrangement of 3β,4β-Epoxyshionane and the Synthesis of Dihydrobaccharis Oxide
Authors: Tachibana Kazuo , Tori Motoo , Moriyama Yoshihiko , Tsuyuki Takahiko , Takahashi Takeyoshi 
Published: July 2006

Abstract
3β,4β-Epoxyshionane (15) was treated with boron trifluoride etherate in ether at −30 °C to give dihydrobaccharis oxide (4; yield 17%), 4α-fluoroshionan-3β-ol (17; 10%), D: B-friedo-bacchar-5-en-3β-ol (18; 18%), D:B-friedo-bacchar-5(10)-en-3β-ol (20; 15%), and D: C-friedo-bacchar-7-en-3β-ol (21; 15%). The reaction in benzene, toluene, cyclohexane, or in hexane at −5 °C or at room temperature yielded bacchar-12-en-3β-ol (5), D: C-friedo-bacchar-8-en-3β-ol (25), 18, 20, and 21. The reaction product ratios in the same reaction in various solvents are listed in Table 1.
Photochemistry of 1,2-Diphenylcyclobutene in Protic Solvents. Addition of Alcohols, Acetic Acid, and Water
Authors: Sakuragi Masako , Sakuragi Hirochika , Hasegawa Masaki 
Published: July 2006

Abstract
Irradiation of 1,2-diphenylcyclobutene (1) in methanol affords the methyl ethers, 1,2-diphenyl-1-methoxycyclobutane (2a) and 1-(α-methoxybenzyl)-1-phenylcyclopropane (3a). In acetic acid and in a mixture of water and dioxane, the corresponding esters (2b and 3b) and alcohols (2c and 3c) are formed, respectively. Evidence supporting the involvement of a singlet species was obtained upon finding that the fluorescence of 1 is substantially quenched upon the addition of methanol or acetic acid to a solution of 1 in hexane.
A Palladium-catalyzed Alkoxycarbonylation of Ethynylmercury Compounds
Authors: Kasahara Akira , Izumi Taeko , Suzuki Akio 
Published: July 2006

Abstract
Bis(phenylethynyl)mercury reacts with carbon monoxide and alcohol at room temperature in the presence of palladium(II) salt to form dialkyl phenylmaleate, accompanied by small amounts of alkyl phenylpropiolate and dialkyl phenylfumarate. An alkoxycarbonylation at 100 °C afforded a trialkoxycarbonylation product, accompanied by dialkoxycarbonylation products. The alkoxycarbonylation of bis(ethylethynyl)mercury proceeds similarly.
Synthesis of 3-(Alkoxycarbonylmethylthio)coumarins from Thiocyanatoacetic Esters and Salicylaldehydes
Authors: Kambe Satoshi , Takajo Tokiharu , Hayashi Toshio , Midorikawa Hiroshi 
Published: July 2006

Abstract
A number of 3-(alkoxycarbonylmethylthio)coumarins (3) were prepared by reactions of thiocyanatoacetic esters (1) with salicylaldehydes in the presence of potassium carbonate.
The Synthesis of Several Octose Derivatives Related to Octosyl Acids A and B
Authors: Anzai Kentaro , Saita Tsuneo 
Published: July 2006

Abstract
Starting from 1,2: 5,6-di-O-isopropylidene-α-d-allofuranose (3a), the sugar portion of octosyl acids A and B (1a and 1b) was synthesised, though with some protecting groups. Compound 7a, thus obtained, was found to be acid-liable, and treatment of 7a in a dilute hydrochloric acid in methanol resulted in furanose-ring opening, affording an isopropylidene compound 8.
The Nuclear Quadrupole Resonance of Dibromoiodate Ions
Authors: Okuda Tsutomu , Tomoyasu Isamu , Yamada Koji , Negita Hisao 
Published: July 2006

Abstract
The NQR sepctra due to 81Br and 127I in potassium dibromoiodate and its monohydrate were observed, and the Zeeman effect of 81Br NQR in the monohydrate was examined. The resonance lines indicate that both compounds have two kinds of dibromoiodate ions and that these ions in the anhydride are slightly asymmetric, while those in the monohydrate are symmetric. The difference in frequency between the two resonance lines due to each resonant nucleus in the monohydrate is explained in terms of the I···Br intermolecular interaction. The charge distributions in both compounds were evaluated to be about −0.6e and 0.2e on the terminal and central atoms respectively.
Structural Studies of Asymmetric Hydrogenation. II. The Crystal Structure of Methyl(R(+)-α-methylbenzylamine)bis(dimethylglyoximato)cobalt(III) Benzene Solvate
Authors: Ohashi Yuji , Sasada Yoshio 
Published: July 2006

Abstract
The structure of methyl (R(+)-α-methylbenzylamine)bis(dimethylglyoximato)cobalt(III) benzene solvate has been determined by X-ray crystal analysis. The crystal is orthorhombic; space group, P212121; Z=4 with a=14.074(1), b=14.390(1), and c=12.202(1) Å. The structure was deduced by the heavy-atom method and refined by the block-diagonal least-squares method to a final R value of 0.063 for 1413 observed reflections. The symmetry of the bis(dimethylglyoximato)cobalt moiety has been lowered from D2h to C2h as a result of the steric repulsion from optically active amine. It is proposed that this deformation is a factor inducing the asymmetry in the hydrogenation catalyzed by the complex of bis(dimethylglyoximato)cobalt and the active amine.
Thermal Decomposition of Hydrogen Cyanide in Shock Waves
Authors: Tabayashi Kiyohiko , Fueno Takayuki , Takasa Kenji , Kajimoto Okitsugu , Okada Kazuo 
Published: July 2006

Abstract
The thermal decomposition of hydrogen cyanide diluted to 0.2, 0.5, and 1.0 mol% in argon was studied behind incident shock waves over the temperature range 2600–3600 K. The decomposition process was followed by monitoring the CN X2Σ+-B2Σ+ (0-0) absorption centered at 3883 Å. The bimolecular rate constants for the reaction HCN+Ar→H+CN+Ar were obtained from the initial slopes of absorption; k1=(1.26±0.28)×1016exp[–(99.69±1.39)kcal mol−1/RT] cm3 mol−1 s−1. The kinetic results are well fitted by the classical collision-theory expression, k1=λ(Z⁄n!)(E⁄RT)nexp(–E⁄RT), with λ=0.22, n=3.5, and E=D0(H–CN)= 118.7 kcal/mol. The overall absorption profiles were found to be explicable on the basis of the reaction scheme involving the homorecombinations of H and CN as well as the chain reaction with H and CN as carrier species.
Reactions of 125I Activated by 125Xe(EC)125I Process with Methane
Authors: Saeki Masakatsu , Tachikawa Enzo 
Published: July 2006

Abstract
The reactions of 125I obtained from the 125Xe(EC)125I process with methane have been investigated. It was confirmed that electron scavengers, such as I2, SF6, and O2, play an important role. The main product is only CH3125I, the yield decreasing significantly with the concentration of Xe. By adding various additives, the yield of CH3125I in the presence of trace amount of I2 was assigned as follows: 8.7±6.7% by the hot atom reaction, 35.8±8.0% by 125I+ in the 1D2 state, and 31.5±2.0% by 125I+ in the 3P states. The results are discussed in comparison with those reported on similar reactions utilizing different activation processes. Chemical sequences of the formation of CH3125I are proposed.
Organic N-Halogen Compounds. X. Preparative Studies on N-Benzimidoylsulfilimines
Authors: Fuchigami Toshio , Odo Keijiro 
Published: July 2006

Abstract
N-Chlorobenzamidine (1) reacted readily with dimethyl sulfide to form N-benzimidoylaminodimethylsulfonium chloride (2). Treatment of 2 with sodium hydroxide gave N-benzimidoyl-S,S-dimethylsulfilimine (3) quantitatively. The thermolysis of acyl derivatives of 3 gave rise to 1,2,4-oxadiazoles. N-Chloro derivative (6) prepared by treating 2 with sodium hypochlorite, reacted with potassium thiocyanate to form N-(3-phenyl-1,2,4-thiadiazolyl-5-yl)-S,S-dimethylsulfilimine (7).
Photochemical Behavior of 1,2-Diphenylcyclobutene in Protic Solvents. Addition of Secondary Amines
Authors: Sakuragi Masako , Sakuragi Hirochika 
Published: July 2006

Abstract
Irradiation of 1,2-diphenylcyclobutene (1) and diethylamine in hexane with light of longer wavelengths than 300 nm affords N,N-diethyl-1,2-diphenylcyclobutanamine (2a), 1,2-diphenylcyclobutane (3), and 1,1′,2,2′-tetraphenylbicyclobutyl (4). Upon similar irradiation, 1 and morpholine afford N-(1,2-diphenylcyclobutyl)morpholine 3 and 4. A mechanism involving a charge-transfer complex is proposed on the basis of the observations that the amines quenched the olefin fluorescence at a rate close to the diffusion limit in hexane, and that when diethylamine-N-d was used as an additive the deuterium was retained in the methine groups of compounds 2a, 3, and 4.
Studies of Unusual Amino Acids and Their Peptides. VIII. The Syntheses of an Iminohexapeptide as a Model of Bottromycin and Its Related Iminopeptides
Authors: Yamada Takashi , Miyazawa Toshifumi , Kuwata Shigeru , Watanabe Hiroshi 
Published: July 2006

Abstract
As a model of bottromycin, the structure of which had been proposed by Nakamura et al., an iminohexapeptide, Z–Val–Val–ImPro–Gly–Phe–Phe–OMe, and its related iminopeptides were synthesized in good yields. These syntheses were achieved by the condensation of the imidates, Z–ImPro–OEt, Z–Val-ImPro–OEt·HCl, or Z–Val–Val–ImPro–OEt·HCl, with the peptide esters, Gly–Phe–OMe·HBr or Gly–Phe–Phe–OMe·HCl, in the presence of triethylamine. All of the resulting iminopeptides were isolated as the hydrobromide or the hydrochloride. The pKa values of these iminopeptide salts were measured to be 9.75–9.3 in methanol-water; they showed that the pKa rule of Nakamura et al. could not be applied in the cases of these iminopeptides.
An X-Ray Diffraction Study on the Structure of the Aqua Indium(III) Ion in the Perchlorate Solution
Authors: Maeda Masunobu , Ohtaki Hitoshi 
Published: July 2006

Abstract
The structure of the aqua indium(III) ion has been studied in a 3 mol dm−3 In(ClO4)3 solution at 25 °C by an X-ray diffraction method. The result showed that the indium(III) ion has six nearest water molecules and the In–OH2 bond distance is 2.15±0.03 Å.
A New Synthesis of 9-Xanthenones by the Reaction of 2-Hydroxybenzophenones with Metal Salts
Authors: Ueda Shuichi , Kurosawa Kazu 
Published: July 2006

Abstract
Seven 2-hydroxy-4-methoxybenzophenones were oxidized with manganese(III) acetate to give 9-xanthenones (24–65%). 2-Hydroxy-3′,4,4′,6-tetramethoxybenzophenone gave 1,3,6,7-tetramethoxy-9-xanthenone in a 5% yield. 2-Hydroxy-3′,4,4′,5-tetramethoxybenzophenone yielded 2,5-dihydroxy-3′,4,4′-trimethoxybenzophenone (9%). The oxidation of the 2-hydroxybenzophenones with lead tetraacetate also gave the 9-xanthenones, but in poor yields.
Synthesis of Corticotropin Peptides. XVI. The Total Syntheses of Porcine and Human Corticotropins
Authors: Inouye Ken , Watanabe Kunio , Otsuka Hideo 
Published: July 2006

Abstract
The syntheses are described of two nonatriacontapeptides corresponding to the primary structure of porcine corticotropin (αp-ACTH) and that of human hormone (αh-ACTH). The porcine peptide is synthesized by assembling three fragment peptides corresponding to ACTH(1–10), ACTH(11–21) and αp-ACTH (22–39). The Synthetic product is compared with natural αp-ACTH in terms of chemical, physicochemical, and biological properties to establish their identity. The human peptide is synthesized via two different routes, one of which is the same as that employed for the synthesis of porcine peptide. The two synthetic preparations of human peptide are not only indistinguishable from each other, but also very similar to αp-ACTH in various items of physicochemical measurements and in the in vivo steroidogenesis assay. The collected data prove the satisfactory synthesis of αh-ACTH as well as αp-ACTH.
Formose Reactions. II. The Photochemical Formose Reaction
Authors: Shigemasa Yoshihiro , Matsuda Yoshinobu , Sakazawa Chikahiro , Matsuura Teruo 
Published: July 2006

Abstract
Under UV irradiation in the presence of an inorganic base, aqueous formaldehyde was found to give pentaerythritol and 2-hydroxymethylglycerol as the main products, accompanied by the concomitant formation of a mixture of sugars and sugar alcohols. The results indicate that this photochemical formose reaction is considerably different in product distribution from the thermal formose reaction using the Ca(OH)2 catalyst. The detailed examination of the photochemical formose reaction was carried out in the presence of Na2CO3, and a possible scheme for the formation of pentaerythritol and 2-hydroxymethylglycerol is proposed.
Factor Group Splitting and the Lowest Triplet State of Tetrachlorophthalic Anhydride Crystals
Authors: Sano Mizuka , Narisawa Takatoshi , Matsuka Mitsunobu , I’Haya Yasumasa J 
Published: July 2006

Abstract
The electronic configuration of the lowest triplet state for tetrachlorophthalic anhydride (TCPA) was determined to be B2(ππ*) by means of Zeeman spectroscopy. The electronic origin for the singlet-triplet absorption of a TCPA single crystal was found in the region of 421.3 nm at 1.7 K. The first peak in the absorption spectrum was found to possess two components; the one observed at 23726.1 cm−1 corresponds to the transition to the Bu, and the other observed at 23728.5 cm−1 to that to the Au triplet factor group state. The splitting between the two states is 2.4 cm−1.
Studies of Peptide Antibiotics. XXXIV. Syntheses of Tyrocidine A and Its Analogs Containing Glycine
Authors: Okamoto Kouji , Nonaka Kazuhiko , Izumiya Nobuo 
Published: July 2006

Abstract
The synthesis of Tyrocidine A (TA), an antibiotic cyclic decapeptide, was achieved by a revised conventional method. Two analogs of TA, 6-glycine-TA and 7-glycine-TA, were synthesized by a similar method to investigate the contribution of l-phenylalanine6 and d-phenylalanine7 residues in TA to its antibacterial activity. The properties of synthetic TA were identical to natural TA. The antibacterial activities of the two analogs were weaker when compared with TA; the activity of 6-glycine-TA being weaker than 7-glycine-TA. The three cyclic peptides synthesized were subjected to droplet countercurrent chromatography (DCCC) and optical rotatory dispersion (ORD), and the elucidation of the difference in the activities between the two analogs was followed with DCCC and ORD.
Catalysis and Mechanism of the Isomerization of a Δ5-3-Keto Steroid
Authors: Okuyama Tadashi , Kitada Akira , Fueno Takayuki 
Published: July 2006

Abstract
The acid- and base-catalyzed isomerizations of Δ5- to Δ4-testosterone have been kinetically studied in aqueous solution. Solvent isotope effects of kH3O+⁄kD3O+=0.69 and kOH−⁄kOD−=3.1 were obtained. It was thus concluded that the acid-catalyzed isomerization proceeds through rate-determining enolization but the base-catalyzed reaction through rate-determining protonation of an enolate ion. It was found that primary amines efficiently catalyze the isomerization via an iminium ion intermediate. Possible bifunctional catalysis was suggested for the high catalytic activity of polyfunctional primary amines.
Ketyl Radicals Formed in Grignard Reaction. IV. Sterically Hindered Ketyl Radicals in Nuclear Replacement and Conjugate Addition
Authors: Okubo Masao 
Published: July 2006

Abstract
The reaction in which 4′-methoxy and 4′-cyano substituents on 2,3,5,6-tetramethylbenzophenone are effectively replaced by benzyl- and t-butylmagnesium chloride was examined by means of ESR measurements. Both the original and the “replaced” ketyl radicals were identified, and an electron-transfer mechanism similar to that of SRN−-type reactions was proposed. Some sterically hindered αβ-enones were also found to form detectable amounts of ketyl radicals. The factors governing the production ratio of the normal and the conjugate adduct were discussed.
A Modified Method of Discrete Fourier Transform Application to Electron Spin Resonance Spectral Data
Authors: Nishikawa Toshio , Someno Kazuo 
Published: July 2006

Abstract
With the development of signal processing techniques, the spectral data obtained from analytical instruments have been collected and searched with the aid of a digital computer. Recognition of the spectrum as a wave pattern is adequate in such situations. The previous study demonstrated signal processing based on this idea, involving the discrete Fourier transform (DFT) applied to ESR spectral data, and the advantages of this method with respect to memory capacity and searching speed. In that study, however, the spectral data were limited to symmetrical traces from organic free radicals in solution, in which case the ESR spectra exhibit isotropic hyperfine structure. This paper describes some modifications of the method rendering it applicable to asymmetrical traces, thus, for general use.
Photochemical Dimroth Rearrangement of 1,4-Diphenyl-5-amino- and 4-Phenyl-5-anilino-1,2,3-triazoles
Authors: Ogata Yoshiro , Takagi Katsuhiko , Hayashi Eiji 
Published: July 2006

Abstract
Irradiation of 1,4-diphenyl-5-amino-1,2,3-triazole (1a) gives 4-phenyl-5-anilino-1,2,3-triazole (2a) and the reverse photochemical reaction is possible. Hence, the reaction is reversible, the ratio of 1a : 2a in equibrium being 1.2–1.7, which is different from the ratio 0.33 in the thermal reaction (Dimroth rearrangement). The mechanism is discussed on the basis of spectral data and analogous reactions.
Synthesis of 10-Hydroxy-2-decenoic Acid (Royal Jelly Acid) from the Butadiene Telomer
Authors: Tsuji Jiro , Masaoka Kazutaka , Takahashi Takashi , Suzuki Akira , Miyaura Norio 
Published: July 2006

Abstract
Ethyl 2-acetyl-4,9-decadienoate obtained by palladium catalyzed reaction of butadiene and ethyl acetoacetate was converted to 4,9-decadienoate. Hydroboration of the terminal olefin gave 10-hydroxy-4-decenoate. After hydrogenation and protection of the hydroxyl group, the double bond was created at the conjugated position by introduction of phenylseleno group and subsequent oxidative removal to give 10-hydroxyl-2-decenoic acid.
The Heat of Solution of Poly(oxyethylehe) Dodecyl Ethers in Dodecane
Authors: Miura Takayasu , Nakamura Masao 
Published: July 2006

Abstract
The heats of mixing of nonionic surfactants, poly(oxyethylene) dodecyl ethers C12H25(OC2H4)nOH (n=0—5) with a nonpolar liquid, dodecane were measured directly with a twin conduction microcalorimeter. A discontinuity appears on the heat of mixing vs. concentration curve except for n=0, the concentration of which decreases exponentially with n. This was regarded as the critical micelle concentration. It was deduced from the heat of solution at infinite dilution, Δsh2\ominus, that the poly(oxyethylene) chain is in a cyclic state in dodecane due to intramolecular hydrogen bonding of the terminal OH group with an oxygen atom in the chain. In addition, the energy of the solute-solvent interaction, Δiu2\ominus, was estimated from Δsh2\ominus, and the heat of evaporation of the solute, Δeh0. As a consequence, the interaction energies of the OH group with nonpolar hydrocarbon are similar, regardless of whether or not the OH group is intramolecularly hydrogen bonded.
Crystal and Molecular Structure of 3-(Adenin-9-yl)propiontryptamide
Authors: Ohki Minoru , Takenaka Akio , Shimanouchi Hirotaka , Sasada Yoshio 
Published: July 2006

Abstract
The crystal structure of 3-(adenin-9-yl)propiontryptamide (3-(adenin-9-yl)-N-[2-(3-indolyl)ethyl]propionamide) has been investigated as a model for adenine-tryptophan interaction. The space group of the crystal is P21/c, with dimensions a=8.512(2), b=16.884(3), c=12.405(3) Å, β=105.54(2)°, and Z=4. The structure was solved by the direct method and refined by a block-diagonal least-squares method. A slight overlapping between adenine and indole moieties is found, but it may not be sufficient to produce a strong π-π interaction. The adenine base is paired with that related by the centre of symmetry through two N(6)H···N(1) hydrogen bonds, and also with the other centrosymmetrically related adenine base through two N(6)H···N(7) hydrogen bonds. Adenine and indole are bound through a hydrogen bond between N(7) of adenine and imino nitrogen of indole.
A Wittig-type Reaction of Phosphoranes with Carbon Monoxide Coordinated to Palladium. A Synthetic Route to Isocyanide Palladium Complexes
Authors: Kiji Jitsuo , Matsumura Akira , Haishi Tomoyuki , Okazaki Satoshi , Furukawa Junji 
Published: July 2006

Abstract
The reaction of carbon monoxide with triphenyl(phenylimino)phosphorane proceeded at room temperature in the coordination sphere of palladium to give a mixture of phenyl isocyanide and carbonyl complexes of palladium. Triphenyl (t-butylimino)phosphorane gave bis(t-butyl isocyanide)palladium chloride in a low yield. Benzophenone triphenylphosphazine and triphenyl(p-tolylsulfonylimino)phosphorane failed to react with carbon monoxide.
Reactions of Thiocarboxylic Acids with Oximes and Nitrones. A New Synthesis of Thiones
Authors: Kimura Kazuhiko , Niwa Hiroaki , Motoki Shinichi 
Published: July 2006

Abstract
The reactions of ketone derivatives containing carbon-nitrogen double bond such as oximes (3), N-alkyloximes (nitrones, 11), oxime O-alkyl ethers, phenylhydrazones and semicarbazones with thiocarboxylic acids were studied for the purpose of preparing thioketones. Both 3 and 11 reacted with thiocarboxylic acids to give thioketones in good yields. The reaction did not proceed in the cases of other ketone derivatives, the starting materials being recovered. The reaction of benzophenone oxime with thiobenzoic acid gave thiobenzophenone, dibenzoyl disulfide and ammonium benzoate, while that of benzophenone-N-methylnitrone with thioacetic acid gave thiobenzophenone and N-acetyl-N-methylhydroxylamine. The mechanisms of these reactions are presented.
Gel Chromatography of β-Diketones and Their Metal Complexes. III. The Chromatographic Behavior of Metal(II, III) Chelates with Acetylacetone in Systems of a Poly(vinyl acetate) Gel and Various Eluting Solvents
Authors: Suzuki Nobuo , Saitoh Koichi 
Published: July 2006

Abstract
Chelate compounds of acetylacetone (2,4-pentanedione) with metal ions (Al(III), Cr(III), Fe(III), Co(III), and Be(II)) were passed through a chromatograph in columns packed with a cross-linked poly(vinyl acetate) gel (Merckogel OR-2000). Various organic solvents (chloroform, benzene, toluene, 1,4-dioxane, ethyl acetate, butyl acetate, acetone, ethyl methyl ketone, and methanol) were used as the eluents. The distribution coefficient, Kav, for each chelate in a given column system was measured to within 0.7% of the relative standard deviation. The Kav values of a chelate were dependent on the solvent used. With most of the solvents, the Kav values of the metal(III)-chelates were close together and smaller than the Kav value of the Be(II)-chelate. The effective molar volume, Veff, of the chelates thus determined, using calibration charts prepared on the basis of elution data for normal alkanes, depended strongly on the solvent used. With all the solvents except chloroform, the Feff values of each chelate were smaller than the literature value of the molar volume for that chelate.
The Photochemical Reaction of 1,2-Naphthoquinones with Aldehydes. III. The Reactions with Aromatic Aldehydes and α, β-Unsaturated Aliphatic Aldehydes
Authors: Takuwa Akio 
Published: July 2006

Abstract
Photochemical reactions of 1,2-naphthoquinone and the substituted derivatives with a variety of aldehydes in the liquid phase have been investigated. The reaction with saturated aliphatic aldehydes gives a mixture of 3-acyl-1,2-naphthalenediol and 1,2-naphthalenediol monoacyl esters. On the other hand, the irradiation of the benzene solution of a 1,2-naphthoquinone derivative and an aromatic aldehyde gives, in general, 1,2-naphthalenediol monoaroyl esters, together with small amounts of other products. Unlike saturated aliphatic aldehydes, α, β-unsaturated aldehydes; i.e., propenal, 2-butenal, trans-2-hexenal, 1-cyclopentenecarbaldehyde, and 1-cyclo-hexenecarbaldehyde, behave similary to the aromatic aldehydes in the photochemical reaction, giving only 1,2-naphthalenediol monoesters. However, 10-undecenal, 3-phenylpropanal, cyclopentanecarbaldehyde, cyclohexanecarbaldehyde, and 3-cyclohexenecarbaldehyde give mixtures of 3-acyl-1,2-naphthalenediols and 1,2-naphthalenediol monoacyl esters similar to those from saturated aliphatic aldehydes. The origin of these significant differences is discussed.